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Augustin Nzayisengab
Aug 13, 2010, 1:23:57 PM8/13/10
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Accessing the WAN (Version 4.0)
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1
At what point in the PPP connection process does the authentication
phase occur?
after NCP establishes Layer 3 parameters
before LCP begins the link establishment process
after the initial Configure-Request message from the link initiator
after the link initiator receives a Configure-Ack message from the
responder
2
What three statements describe the roles of devices in a WAN? (Choose
three.)
A CSU/DSU terminates a digital local loop.
A modem terminates a digital local loop.
A CSU/DSU terminates an analog local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.
A router is commonly considered a DCE device.
3
Which wireless solution can provide mobile users with non line-of-
sight broadband Internet access at speeds comparable to DSL or cable?
Wi-Fi
WiMAX
satellite
Metro Ethernet
4
Refer to the exhibit. The network administrator creates a standard
access control list to prohibit traffic from the 192.168.1.0/24
network from reaching the 192.168.2.0/24 network while still
permitting Internet access for all networks. On which router interface
and in which direction should it be applied?
interface fa0/0/0, inbound
interface fa0/0/0, outbound
interface fa0/0/1, inbound
interface fa0/0/1, outbound
5
While configuring a router using RIPng and dual-stack technology with
IPv4 and IPv6, the administrator receives an error message when
inputting IPv4 routes. What could cause the error message?
IPv4 is not compatible with RIPng
RIPng is incompatible with dual-stack technology.
The router interfaces have been configured with incorrect addresses.
When IPv4 and IPv6 are configured on the same interface, all IPv4
addresses are shut down in favor of the newer technology.
6
Refer to the exhibit. What would be the result of entering the
exhibited configuration on a Frame Relay router?
The local interface DLCI will be set to 102.
All traffic that is destined to 172.16.16.8 will be sent as broadcast.
Only broadcast traffic will be recieved on the Frame Relay interface.
Routing protocol multicast updates can be forwarded across the Frame
Relay PVC.
7
What is the function of an IDS?
to report the attack after it happens
to stop the attack prior to its completion
to quarantine the virus or worm so as not to infect any other host
to reconfigure the security policy of a firewall to prevent another
attack
8
Refer to the exhibit. Routers R1 and R2 are both configured for single
area OSPF. Users who are connected to switch S1 are unable to access
database applications that run on servers that are connected to S2.
The network engineer is working remotely and only has the information
that is shown in the exhibit to direct initial troubleshooting
efforts. Based on the exhibit, which OSI layer is the most appropriate
to start with for a divide-and-conquer approach?
network layer
application layer
data-link layer
physical layer
9
What are two characteristics of DSL technology? (Choose two.)
Uploads typically offer larger transfer rates than downloads.
Service providers deploy DSL in the local loop of the telephone
network.
DSL download rates are reduced by large volumes of POTS voice traffic.
Filters and splitters allow POTS and DSL traffic to share the same
medium.
DSL is a shared medium that allows many users to share bandwidth
available from the DSLAM.
10
Which combination of Layer 2 protocol and authentication should be
used to establish a link between a Cisco and a non-Cisco router
without sending authentication information in plain text?
HDLC with PAP
HDLC with CHAP
PPP with PAP
PPP with CHAP
11
Which wildcard mask would specify all IP addresses from 192.168.8.0
through 192.168.15.255?
0.0.0.7
0.0.7.255
0.0.8.255
0.0.15.255
0.0.255.255
12
A network technician accidentally deleted the IOS image from flash and
rebooted the router. Which two options can be used to restore the IOS
image? (Choose two.)
Perform a system restore through SDM.
Download the image from a TFTP server through a network connection.
Download the image from a TFTP server through a console connection.
Establish an FTP session through an SSH connection for the image
download.
Use the Xmodem protocol to download the image through a console
connection.
13
What does an access control list determine when used with NAT on a
Cisco router?
addresses that are to be translated
addresses that are assigned to a NAT pool
addresses that are allowed out of the router
addresses that are accessible from the inside network
14
A company uses a PVC with a committed information rate (CIR) of 128 kb/
s and a committed burst information rate (CBIR) of 64 kb/s. The link
is used to periodically send updates at a rate of 144 kb/s. What will
happen to the update traffic?
The traffic will be sent, but the company will be charged a penalty.
The traffic will be sent using the additional CBIR and will be
guaranteed delivery.
The traffic will be dropped at the CO for exceeding the committed
information rate.
The traffic will be sent, but the burst traffic will be marked for
discard if congestion is encountered.
15
What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0
0.0.0.255 any eq www command have when implemented inbound on the f0/0
interface?
All TCP traffic is permitted, and all other traffic is denied.
The command is rejected by the router because it is incomplete.
All traffic from 172.16.4.0/24 is permitted anywhere on any port.
Traffic originating from 172.16.4.0/24 is permitted to all TCP port 80
destinations.
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16
Refer to the exhibit. What is the effect of the extended ACL when
applied inbound on the S0/0/0 interface on R2?
All IP traffic will be permitted during the specified days and time
range.
Both IP and Telnet traffic will be permitted during the specified days
and time range.
Only Telnet traffic destined for 172.16.10.0/24 will be permitted
during the specified days and time range.
Telnet traffic will be permitted only during the specified days and
time range. All other network traffic will be permitted any time.
17
Refer to the exhibit. A host that is connected to Fa0/0 is unable to
acquire an IP address dynamically from the DHCP server. The output of
the debug ip dhcp server command shows "DHCPD: there is no address
pool for 172.16.1.1". What is the problem?
The default router for the 172Network pool is incorrect.
The 172.16.1.1 address is already configured on Fa0/0.
The pool of addresses for the 172Network pool is incorrect.
The ip helper-address command should be implemented on the Fa0/0
interface.
18
A company has its headquarters office in Dallas and five branch
offices located in New York, Chicago, Los Angeles, Seattle, and
Atlanta. WAN links are used for communications among offices in six
sites. In planning the WAN links, the network designer is given two
requirements: (1) minimize cost and (2) provide a certain level of WAN
link reliability with redundant links. Which topology should the
network designer recommend?
star
full mesh
hierarchical
partial mesh
19
Refer to the exhibit. The corporate network that is shown has been
assigned network 172.16.128.0/19 for use at branch office LANs. VLSM
is not being used. Which subnet mask will allow the most efficient
utilization of IP addresses?
/21
/22
/23
/24
/25
/26
20
Refer to the exhibit. Which statement is true about the WAN switch
device?
It uses a multiport internetworking device to switch traffic such as
Frame Relay, ATM or X.25 over the WAN.
It provides internetworking and WAN access interface ports that are
used to connect to the service provider network.
It provides termination for the digital signal and ensures connection
integrity through error correction and line monitoring.
It converts the digital signals produced by a computer into voice
frequencies that can be transmitted over the analog lines of the
public telephone network.
21
Which three items are LCP options that can be configured for PPP?
(Choose three.)
CHAP
Stacker
IPCP
CDPCP
Multilink
22
Which statement is true about an interface that is configured with the
IPv6 address command?
IPv6 traffic-forwarding is enabled on the interface.
A link-local IPv6 address is automatically configured on the
interface.
A global unicast IPv6 address is dynamically configured the interface.
Any IPv4 addresses that are assigned to the interface are replaced
with an IPv6 address.
23
Refer to the exhibit. A network administrator is using two routers to
test a WAN connection . What can be concluded based on the output of
the show running-config commands?
The WAN link is using PPP encapsulation.
The WAN link speed is faster than a T1 line.
The router R2 serves as the DCE for the WAN link.
The WAN link is configured with the Cisco default encapsulation
protocol.
24
What will be the result of adding the command ip dhcp excluded-address
172.16.4.1 172.16.4.5 to the configuration of a local router that has
been configured as a DHCP server?
Traffic that is destined for 172.16.4.1 and 172.16.4.5 will be dropped
by the router.
Traffic will not be routed from clients with addresses between
172.16.4.1 and 172.16.4.5.
The DHCP server function of the router will not issue the addresses
between 172.16.4.1 and 172.16.4.5.
The router will ignore all traffic that comes from the DHCP servers
with addresses 172.16.4.1 and 172.16.4.5.
25
Refer to the exhibit. Branch A has a Cisco router. Branch B has a non-
Cisco router set for IETF encapsulation. After the commands shown are
entered, R2 and R3 fail to establish the PVC. The R2 LMI is Cisco, and
the R3 LMI is ANSI. The LMI is successfully established at both
locations. Why is the PVC failing?
The PVC to R3 must be point-to-point.
LMI types must match on each end of a PVC.
The ietf parameter is missing from the frame-relay map ip 10.10.10.3
203 command.
The PVCs at R2 use different encapsulation types. A single port can
only support one encapsulation type.
26
Refer to the exhibit. Why are the routers unable to establish a PPP
session?
The usernames are misconfigured.
The IP addresses are on different subnets.
The clock rate is configured on the wrong end of the link.
The CHAP passwords must be different on the two routers.
Interface serial 0/0/0 on Router1 must connect to interface serial
0/0/1 on Router2.
27
Refer to the exhibit. In the partial router configuration that is
shown, what is the purpose of access list BLOCK_XYZ?
to prevent source IP address spoofing by hosts on the Fa0/0 LAN
to block access by Fa0/0 LAN hosts to all network services beyond the
router
to prevent users on the Fa0/0 LAN from opening Telnet sessions on the
router
to secure Fa0/0 hosts by allowing only locally sourced traffic into
the Fa0/0 LAN
28
Refer to the exhibit. The SSH connections between the remote user and
the server are failing. The correct configuration of NAT has been
verified. What is the most likely cause of the problem?
SSH is unable to pass through NAT.
There are incorrect access control list entries.
The access list has the incorrect port number for SSH.
The ip helper command is required on S0/0/0 to allow inbound
connections.
29
Refer to the exhibit. An administrator has added the exhibited
commands to routers A and B, but no routing updates are exchanged
between the two routers. Based on the information that is given, what
is the likely cause of the problem?
Router A is advertising the wrong network.
The authentication key strings do not match.
The serial interfaces of routers A and B are not on the same network.
The authentication key numbers do not match the EIGRP process number
for both routers.
30
Refer to the exhibit. An ACL numbered 101 already exists on this
router. What happens if the network administrator issues the commands
that are shown in the exhibit?
The new ACL overwrites the existing ACL.
The network administrator will receive an error message.
The existing ACL is modified to include the new commands.
A second ACL that is numbered 101 is created and contains only the new
commands.
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31
Refer to the exhibit. A network technician has been called in to
resolve a problem with this network segment. The symptoms include a
loss of connectivity throughout the network segment, high link
utilization, and syslog messages that indicate constant MAC address
relearning. What is the likely cause of these symptoms?
cable fault
faulty NIC card
IP addressing error
spanning tree problem
NAT configuration error
32
Refer to the exhibit. A network administrator is trying to backup the
IOS software on R1 to the TFTP server. He receives the error message
that is shown in the exhibit, and cannot ping the TFTP server from R1.
What action can help to isolate this problem?
Check that R1 has a route to the 10.10.10.0 network.
Verify that the TFTP server software supports binary file transfers.
Make sure that the TFTP server has 192.168.1.1 as its default gateway.
Ensure that the laptop has an IP address in the 192.168.1.0/24
network.
33
Which important piece of troubleshooting information can be discovered
about a serial interface using the show controllers command?
queuing strategy
serial cable type
interface IP address
encapsulation method
34
Refer to the exhibit. You are a network administrator who has been
tasked with completing the Frame Relay topology that interconnects two
remote sites. How should the point-to-point subinterfaces be
configured on HQ to complete the topology?
HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1
HQ(config-subif)#frame-relay interface-dlci 203 on Serial 0/0/0.2
HQ(config-subif)#frame-relay interface-dlci 301 on Serial 0/0/0.1
HQ(config-subif)# frame-relay interface-dlci 302 on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on
Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 203 broadcast on Serial
0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 301 broadcast on
Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 302 broadcast on Serial
0/0/0.2
35
Refer to the exhibit. A packet is being sent from Host A to Host B
through the VPN tunnel between R1 and R3. When the packet first
arrives at R3, what are the source and destination IP addresses of the
packet?
Source 192.168.1.2 - Destination 192.168.4.2
Source 192.168.3.1 - Destination 192.168.3.2
Source 192.168.2.1 - Destination 192.168.3.2
Source 192.168.3.1 - Destination 192.168.4.2
36
At what physical location does the responsibility for a WAN connection
change from the service provider to the user?
DMZ
local loop
CSU/DSU
demarcation point
37
When configuring remote access to a router, what is the significance
of the no password command on a VTY line?
Logins are prevented on that line.
No password is required to log in to that line.
The remote user is not allowed to change the password for that line.
The remote user is prompted to change the line password after
connecting to the router.
38
Which address provides an example of an IPv6 link-local address?
FE80::1324:ABCD
2001:2345:AB12:1935::FEFF
2001:1234:0000:9CA::0876/64
1234:ABCD:5678:EF00:9234:AA22:5527:FC35
39
A system administrator must provide Internet connectivity for ten
hosts in a small remote office. The ISP has assigned two public IP
addresses to this remote office. How can the system administrator
configure the router to provide Internet access to all ten users at
the same time?
Configure static NAT.
Configure dynamic NAT.
Configure static NAT with overload.
Configure dynamic NAT with overload.
40
Refer to the exhibit. What is placed in the address field in the
header of a frame that will travel from the DC office of ABC Company
to the Orlando office?
MAC address of the Orlando router
MAC address of the DC router
192.168.1.25
192.168.1.26
DLCI 100
DLCI 200
41
What is a major characteristic of a worm?
malicious software that copies itself into other executable programs
tricks users into running the infected software
a set of computer instructions that lies dormant until triggered by a
specific event
exploits vulnerabilities with the intent of propagating itself across
a network
42
Refer to the exhibit. Which VLAN will carry untagged traffic on
FastEthernet 0/1?
VLAN 1
VLAN 2
VLAN 11
VLAN 12
VLAN 30
VLAN 999
43
What will be the result of the enable secret command when added at the
global configuration mode on the router?
It will use MD5 encryption to protect the privileged EXEC level
access.
It will use type 7 encryption and will encrypt only the privileged
EXEC level passwords.
It will use type 7 encryption to prevent all passwords that are
displayed on the screen from being readable.
It will use MD5 encryption to protect the passwords that are only used
in the PAP and CHAP authentication process.
44
A network administrator added two switches and a new VLAN over the
past weekend. How can the administrator determine if the additions and
changes improved performance and availability on the company intranet?
Perform a baseline test and compare the current values to values that
were obtained in previous weeks.
Interview departmental secretaries and determine if they think load
time for web pages is improved.
Compare the hit counts on the company web server for the current week
to the values that were recorded from previous weeks.
Performance on the intranet can be determined by monitoring load times
of company web pages from remote sites.
45
An administrator is unable to receive e-mail. While troubleshooting
the problem, the administrator is able to ping the local mail server
IP address successfully from a remote network and can successfully
resolve the mail server name to an IP address via the use of the
nslookup command. At what layer of the OSI model is the problem most
likely to be found?
application
transport
network
data link
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46
Which two functions are provided by the Local Management Interface
(LMI) that is used in Frame Relay networks? (Choose two.)
flow control
error notification
congestion notification
the mapping of DLCIs to network addresses
the sending of keepalive packets to verify operation of the PVC
47
Refer to the exhibit. Which statement is true about the status of the
Frame Relay connection?
The Frame Relay connection is in the process of negotiation.
Only packets with control bit DE set are sent over the PVC. No data
traffic traverses the link.
Packets marked as FECN and BECN indicate that a congestion control
mechanism is enabled on the Frame Relay PVC.
The “DLCI USAGE = LOCAL” status indicates that the PVC link is not
established between the interface S0/0/0.1 and the Frame Relay switch.
48
Refer to the exhibit. A technician is teaching a trainee to interpret
the results of various Frame Relay troubleshooting commands. What
conclusion can be drawn from the output that is shown?
Neighboring routers should use DLCI 177 to reach the Branch router.
DLCI 177 will be used to identify all broadcasts that are sent out the
Branch router.
The Branch router has the address 192.168.3.1 configured for the
S0/0/0 interface.
To reach 192.168.3.1, the Branch router will use the virtual circuit
that is identified by DLCI 177.
49
Refer to the exhibit. Which two statements correctly describe how
Router1 processes an FTP request that enters interface S0/0/0 and is
destined for an FTP server at IP address 192.168.1.5? (Choose two.)
The packet does not match an access list condition.
The router matches the incoming packet to the statement that is
created from the access-list 201 permit ip any any command.
The router matches the incoming packet to the statement that is
created from the access-list 101 permit ip any 192.168.1.0 0.0.0.255
command.
The router matches the incoming packet to the statement that is
created from the access-list 201 deny icmp 192.168.1.0 0.0.0.255 any
command.
The packet is allowed into Router1.
50
Refer to the exhibit. Router1 and Router2 each support separate areas
of a data center, and are connected via a crossover cable. Resources
attached to Router1 are unable to connect to resources attached to
Router2. What is the likely cause?
The crossover cable is faulty.
The IP addressing is incorrect.
There is a Layer 2 problem with the router connection.
The upper layers are experiencing an unspecified problem.
One or both of the Ethernet interfaces are not working correctly.
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1
At what point in the PPP connection process does the authentication
phase occur?
after NCP establishes Layer 3 parameters
before LCP begins the link establishment process
after the initial Configure-Request message from the link initiator
after the link initiator receives a Configure-Ack message from the
responder
2
What three statements describe the roles of devices in a WAN? (Choose
three.)
A CSU/DSU terminates a digital local loop.
A modem terminates a digital local loop.
A CSU/DSU terminates an analog local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.
A router is commonly considered a DCE device.
3
Which wireless solution can provide mobile users with non line-of-
sight broadband Internet access at speeds comparable to DSL or cable?
Wi-Fi
WiMAX
satellite
Metro Ethernet
4
Refer to the exhibit. The network administrator creates a standard
access control list to prohibit traffic from the 192.168.1.0/24
network from reaching the 192.168.2.0/24 network while still
permitting Internet access for all networks. On which router interface
and in which direction should it be applied?
interface fa0/0/0, inbound
interface fa0/0/0, outbound
interface fa0/0/1, inbound
interface fa0/0/1, outbound
5
While configuring a router using RIPng and dual-stack technology with
IPv4 and IPv6, the administrator receives an error message when
inputting IPv4 routes. What could cause the error message?
IPv4 is not compatible with RIPng
RIPng is incompatible with dual-stack technology.
The router interfaces have been configured with incorrect addresses.
When IPv4 and IPv6 are configured on the same interface, all IPv4
addresses are shut down in favor of the newer technology.
6
Refer to the exhibit. What would be the result of entering the
exhibited configuration on a Frame Relay router?
The local interface DLCI will be set to 102.
All traffic that is destined to 172.16.16.8 will be sent as broadcast.
Only broadcast traffic will be recieved on the Frame Relay interface.
Routing protocol multicast updates can be forwarded across the Frame
Relay PVC.
7
What is the function of an IDS?
to report the attack after it happens
to stop the attack prior to its completion
to quarantine the virus or worm so as not to infect any other host
to reconfigure the security policy of a firewall to prevent another
attack
8
Refer to the exhibit. Routers R1 and R2 are both configured for single
area OSPF. Users who are connected to switch S1 are unable to access
database applications that run on servers that are connected to S2.
The network engineer is working remotely and only has the information
that is shown in the exhibit to direct initial troubleshooting
efforts. Based on the exhibit, which OSI layer is the most appropriate
to start with for a divide-and-conquer approach?
network layer
application layer
data-link layer
physical layer
9
What are two characteristics of DSL technology? (Choose two.)
Uploads typically offer larger transfer rates than downloads.
Service providers deploy DSL in the local loop of the telephone
network.
DSL download rates are reduced by large volumes of POTS voice traffic.
Filters and splitters allow POTS and DSL traffic to share the same
medium.
DSL is a shared medium that allows many users to share bandwidth
available from the DSLAM.
10
Which combination of Layer 2 protocol and authentication should be
used to establish a link between a Cisco and a non-Cisco router
without sending authentication information in plain text?
HDLC with PAP
HDLC with CHAP
PPP with PAP
PPP with CHAP
11
Which wildcard mask would specify all IP addresses from 192.168.8.0
through 192.168.15.255?
0.0.0.7
0.0.7.255
0.0.8.255
0.0.15.255
0.0.255.255
12
A network technician accidentally deleted the IOS image from flash and
rebooted the router. Which two options can be used to restore the IOS
image? (Choose two.)
Perform a system restore through SDM.
Download the image from a TFTP server through a network connection.
Download the image from a TFTP server through a console connection.
Establish an FTP session through an SSH connection for the image
download.
Use the Xmodem protocol to download the image through a console
connection.
13
What does an access control list determine when used with NAT on a
Cisco router?
addresses that are to be translated
addresses that are assigned to a NAT pool
addresses that are allowed out of the router
addresses that are accessible from the inside network
14
A company uses a PVC with a committed information rate (CIR) of 128 kb/
s and a committed burst information rate (CBIR) of 64 kb/s. The link
is used to periodically send updates at a rate of 144 kb/s. What will
happen to the update traffic?
The traffic will be sent, but the company will be charged a penalty.
The traffic will be sent using the additional CBIR and will be
guaranteed delivery.
The traffic will be dropped at the CO for exceeding the committed
information rate.
The traffic will be sent, but the burst traffic will be marked for
discard if congestion is encountered.
15
What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0
0.0.0.255 any eq www command have when implemented inbound on the f0/0
interface?
All TCP traffic is permitted, and all other traffic is denied.
The command is rejected by the router because it is incomplete.
All traffic from 172.16.4.0/24 is permitted anywhere on any port.
Traffic originating from 172.16.4.0/24 is permitted to all TCP port 80
destinations.
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16
Refer to the exhibit. What is the effect of the extended ACL when
applied inbound on the S0/0/0 interface on R2?
All IP traffic will be permitted during the specified days and time
range.
Both IP and Telnet traffic will be permitted during the specified days
and time range.
Only Telnet traffic destined for 172.16.10.0/24 will be permitted
during the specified days and time range.
Telnet traffic will be permitted only during the specified days and
time range. All other network traffic will be permitted any time.
17
Refer to the exhibit. A host that is connected to Fa0/0 is unable to
acquire an IP address dynamically from the DHCP server. The output of
the debug ip dhcp server command shows "DHCPD: there is no address
pool for 172.16.1.1". What is the problem?
The default router for the 172Network pool is incorrect.
The 172.16.1.1 address is already configured on Fa0/0.
The pool of addresses for the 172Network pool is incorrect.
The ip helper-address command should be implemented on the Fa0/0
interface.
18
A company has its headquarters office in Dallas and five branch
offices located in New York, Chicago, Los Angeles, Seattle, and
Atlanta. WAN links are used for communications among offices in six
sites. In planning the WAN links, the network designer is given two
requirements: (1) minimize cost and (2) provide a certain level of WAN
link reliability with redundant links. Which topology should the
network designer recommend?
star
full mesh
hierarchical
partial mesh
19
Refer to the exhibit. The corporate network that is shown has been
assigned network 172.16.128.0/19 for use at branch office LANs. VLSM
is not being used. Which subnet mask will allow the most efficient
utilization of IP addresses?
/21
/22
/23
/24
/25
/26
20
Refer to the exhibit. Which statement is true about the WAN switch
device?
It uses a multiport internetworking device to switch traffic such as
Frame Relay, ATM or X.25 over the WAN.
It provides internetworking and WAN access interface ports that are
used to connect to the service provider network.
It provides termination for the digital signal and ensures connection
integrity through error correction and line monitoring.
It converts the digital signals produced by a computer into voice
frequencies that can be transmitted over the analog lines of the
public telephone network.
21
Which three items are LCP options that can be configured for PPP?
(Choose three.)
CHAP
Stacker
IPCP
CDPCP
Multilink
22
Which statement is true about an interface that is configured with the
IPv6 address command?
IPv6 traffic-forwarding is enabled on the interface.
A link-local IPv6 address is automatically configured on the
interface.
A global unicast IPv6 address is dynamically configured the interface.
Any IPv4 addresses that are assigned to the interface are replaced
with an IPv6 address.
23
Refer to the exhibit. A network administrator is using two routers to
test a WAN connection . What can be concluded based on the output of
the show running-config commands?
The WAN link is using PPP encapsulation.
The WAN link speed is faster than a T1 line.
The router R2 serves as the DCE for the WAN link.
The WAN link is configured with the Cisco default encapsulation
protocol.
24
What will be the result of adding the command ip dhcp excluded-address
172.16.4.1 172.16.4.5 to the configuration of a local router that has
been configured as a DHCP server?
Traffic that is destined for 172.16.4.1 and 172.16.4.5 will be dropped
by the router.
Traffic will not be routed from clients with addresses between
172.16.4.1 and 172.16.4.5.
The DHCP server function of the router will not issue the addresses
between 172.16.4.1 and 172.16.4.5.
The router will ignore all traffic that comes from the DHCP servers
with addresses 172.16.4.1 and 172.16.4.5.
25
Refer to the exhibit. Branch A has a Cisco router. Branch B has a non-
Cisco router set for IETF encapsulation. After the commands shown are
entered, R2 and R3 fail to establish the PVC. The R2 LMI is Cisco, and
the R3 LMI is ANSI. The LMI is successfully established at both
locations. Why is the PVC failing?
The PVC to R3 must be point-to-point.
LMI types must match on each end of a PVC.
The ietf parameter is missing from the frame-relay map ip 10.10.10.3
203 command.
The PVCs at R2 use different encapsulation types. A single port can
only support one encapsulation type.
26
Refer to the exhibit. Why are the routers unable to establish a PPP
session?
The usernames are misconfigured.
The IP addresses are on different subnets.
The clock rate is configured on the wrong end of the link.
The CHAP passwords must be different on the two routers.
Interface serial 0/0/0 on Router1 must connect to interface serial
0/0/1 on Router2.
27
Refer to the exhibit. In the partial router configuration that is
shown, what is the purpose of access list BLOCK_XYZ?
to prevent source IP address spoofing by hosts on the Fa0/0 LAN
to block access by Fa0/0 LAN hosts to all network services beyond the
router
to prevent users on the Fa0/0 LAN from opening Telnet sessions on the
router
to secure Fa0/0 hosts by allowing only locally sourced traffic into
the Fa0/0 LAN
28
Refer to the exhibit. The SSH connections between the remote user and
the server are failing. The correct configuration of NAT has been
verified. What is the most likely cause of the problem?
SSH is unable to pass through NAT.
There are incorrect access control list entries.
The access list has the incorrect port number for SSH.
The ip helper command is required on S0/0/0 to allow inbound
connections.
29
Refer to the exhibit. An administrator has added the exhibited
commands to routers A and B, but no routing updates are exchanged
between the two routers. Based on the information that is given, what
is the likely cause of the problem?
Router A is advertising the wrong network.
The authentication key strings do not match.
The serial interfaces of routers A and B are not on the same network.
The authentication key numbers do not match the EIGRP process number
for both routers.
30
Refer to the exhibit. An ACL numbered 101 already exists on this
router. What happens if the network administrator issues the commands
that are shown in the exhibit?
The new ACL overwrites the existing ACL.
The network administrator will receive an error message.
The existing ACL is modified to include the new commands.
A second ACL that is numbered 101 is created and contains only the new
commands.
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31
Refer to the exhibit. A network technician has been called in to
resolve a problem with this network segment. The symptoms include a
loss of connectivity throughout the network segment, high link
utilization, and syslog messages that indicate constant MAC address
relearning. What is the likely cause of these symptoms?
cable fault
faulty NIC card
IP addressing error
spanning tree problem
NAT configuration error
32
Refer to the exhibit. A network administrator is trying to backup the
IOS software on R1 to the TFTP server. He receives the error message
that is shown in the exhibit, and cannot ping the TFTP server from R1.
What action can help to isolate this problem?
Check that R1 has a route to the 10.10.10.0 network.
Verify that the TFTP server software supports binary file transfers.
Make sure that the TFTP server has 192.168.1.1 as its default gateway.
Ensure that the laptop has an IP address in the 192.168.1.0/24
network.
33
Which important piece of troubleshooting information can be discovered
about a serial interface using the show controllers command?
queuing strategy
serial cable type
interface IP address
encapsulation method
34
Refer to the exhibit. You are a network administrator who has been
tasked with completing the Frame Relay topology that interconnects two
remote sites. How should the point-to-point subinterfaces be
configured on HQ to complete the topology?
HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1
HQ(config-subif)#frame-relay interface-dlci 203 on Serial 0/0/0.2
HQ(config-subif)#frame-relay interface-dlci 301 on Serial 0/0/0.1
HQ(config-subif)# frame-relay interface-dlci 302 on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on
Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 203 broadcast on Serial
0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 301 broadcast on
Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 302 broadcast on Serial
0/0/0.2
35
Refer to the exhibit. A packet is being sent from Host A to Host B
through the VPN tunnel between R1 and R3. When the packet first
arrives at R3, what are the source and destination IP addresses of the
packet?
Source 192.168.1.2 - Destination 192.168.4.2
Source 192.168.3.1 - Destination 192.168.3.2
Source 192.168.2.1 - Destination 192.168.3.2
Source 192.168.3.1 - Destination 192.168.4.2
36
At what physical location does the responsibility for a WAN connection
change from the service provider to the user?
DMZ
local loop
CSU/DSU
demarcation point
37
When configuring remote access to a router, what is the significance
of the no password command on a VTY line?
Logins are prevented on that line.
No password is required to log in to that line.
The remote user is not allowed to change the password for that line.
The remote user is prompted to change the line password after
connecting to the router.
38
Which address provides an example of an IPv6 link-local address?
FE80::1324:ABCD
2001:2345:AB12:1935::FEFF
2001:1234:0000:9CA::0876/64
1234:ABCD:5678:EF00:9234:AA22:5527:FC35
39
A system administrator must provide Internet connectivity for ten
hosts in a small remote office. The ISP has assigned two public IP
addresses to this remote office. How can the system administrator
configure the router to provide Internet access to all ten users at
the same time?
Configure static NAT.
Configure dynamic NAT.
Configure static NAT with overload.
Configure dynamic NAT with overload.
40
Refer to the exhibit. What is placed in the address field in the
header of a frame that will travel from the DC office of ABC Company
to the Orlando office?
MAC address of the Orlando router
MAC address of the DC router
192.168.1.25
192.168.1.26
DLCI 100
DLCI 200
41
What is a major characteristic of a worm?
malicious software that copies itself into other executable programs
tricks users into running the infected software
a set of computer instructions that lies dormant until triggered by a
specific event
exploits vulnerabilities with the intent of propagating itself across
a network
42
Refer to the exhibit. Which VLAN will carry untagged traffic on
FastEthernet 0/1?
VLAN 1
VLAN 2
VLAN 11
VLAN 12
VLAN 30
VLAN 999
43
What will be the result of the enable secret command when added at the
global configuration mode on the router?
It will use MD5 encryption to protect the privileged EXEC level
access.
It will use type 7 encryption and will encrypt only the privileged
EXEC level passwords.
It will use type 7 encryption to prevent all passwords that are
displayed on the screen from being readable.
It will use MD5 encryption to protect the passwords that are only used
in the PAP and CHAP authentication process.
44
A network administrator added two switches and a new VLAN over the
past weekend. How can the administrator determine if the additions and
changes improved performance and availability on the company intranet?
Perform a baseline test and compare the current values to values that
were obtained in previous weeks.
Interview departmental secretaries and determine if they think load
time for web pages is improved.
Compare the hit counts on the company web server for the current week
to the values that were recorded from previous weeks.
Performance on the intranet can be determined by monitoring load times
of company web pages from remote sites.
45
An administrator is unable to receive e-mail. While troubleshooting
the problem, the administrator is able to ping the local mail server
IP address successfully from a remote network and can successfully
resolve the mail server name to an IP address via the use of the
nslookup command. At what layer of the OSI model is the problem most
likely to be found?
application
transport
network
data link
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46
Which two functions are provided by the Local Management Interface
(LMI) that is used in Frame Relay networks? (Choose two.)
flow control
error notification
congestion notification
the mapping of DLCIs to network addresses
the sending of keepalive packets to verify operation of the PVC
47
Refer to the exhibit. Which statement is true about the status of the
Frame Relay connection?
The Frame Relay connection is in the process of negotiation.
Only packets with control bit DE set are sent over the PVC. No data
traffic traverses the link.
Packets marked as FECN and BECN indicate that a congestion control
mechanism is enabled on the Frame Relay PVC.
The “DLCI USAGE = LOCAL” status indicates that the PVC link is not
established between the interface S0/0/0.1 and the Frame Relay switch.
48
Refer to the exhibit. A technician is teaching a trainee to interpret
the results of various Frame Relay troubleshooting commands. What
conclusion can be drawn from the output that is shown?
Neighboring routers should use DLCI 177 to reach the Branch router.
DLCI 177 will be used to identify all broadcasts that are sent out the
Branch router.
The Branch router has the address 192.168.3.1 configured for the
S0/0/0 interface.
To reach 192.168.3.1, the Branch router will use the virtual circuit
that is identified by DLCI 177.
49
Refer to the exhibit. Which two statements correctly describe how
Router1 processes an FTP request that enters interface S0/0/0 and is
destined for an FTP server at IP address 192.168.1.5? (Choose two.)
The packet does not match an access list condition.
The router matches the incoming packet to the statement that is
created from the access-list 201 permit ip any any command.
The router matches the incoming packet to the statement that is
created from the access-list 101 permit ip any 192.168.1.0 0.0.0.255
command.
The router matches the incoming packet to the statement that is
created from the access-list 201 deny icmp 192.168.1.0 0.0.0.255 any
command.
The packet is allowed into Router1.
50
Refer to the exhibit. Router1 and Router2 each support separate areas
of a data center, and are connected via a crossover cable. Resources
attached to Router1 are unable to connect to resources attached to
Router2. What is the likely cause?
The crossover cable is faulty.
The IP addressing is incorrect.
There is a Layer 2 problem with the router connection.
The upper layers are experiencing an unspecified problem.
One or both of the Ethernet interfaces are not working correctly.
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