C1841

[Marylouise Colleen]

Originalhand-coloured engraving c1841 by Willliam Home Lizars for The Naturalist's Library, Mammalia, Marsupialia or Pouched Animals by George Waterhouse (1789-1856). Published in Edinburgh in 1841 - also by W.H. Lizars - for Sir William Jardine. Between 1833 and 1843 Lizars engraved between 30 and 40 small portraits of different species of 40 familiies of fauna from the drawings of eminent naturalists in each field.

Page size 105 x 170mm (4 1/8 x 6 5/8 inches). Mounted between 'antique-white' ragmat conservation mattboard and covered with cellophane for protection and presentation. External size for framing is approximately 22 x 28cm.

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Cisco IOS (Internetwork Operating System) is a proprietary operating system. It allows you to control and manage the router or the switch on which it is running. Originally, Cisco developed it for routers, but over the last few years, Cisco has been porting it to its other platforms, including the Catalyst switches.

Cisco makes many types of routers and switches. Different models use different hardware components such as CPU, RAM, and physical interfaces. Low-end routers or fixed chassis routers have limited physical interfaces. High-end routers or modular chassis routers have multiple physical interfaces.

Because of the hardware difference, Cisco compiles different IOS variants for every platform and model. Each IOS variant includes similar features for general functions and some model-specific features for the model or the product-specific requirements.

Two IOS variants may contain similar features or completely different features. The features that are the same in all variants are known as the base features. The features that are different in each variant are known as the add-on features.

Cisco builds the IOS as a single image file. Instead of releasing bug fixes and updates separately, Cisco compiles them into a new IOS image file and releases it. Because of the approach, if you want to update an existing IOS, you have to download and install the updated IOS image file.

When selecting or updating a Cisco IOS, it is important to choose the proper IOS image file with the correct feature set and version. To make this process easier, Cisco uses a special naming convention for IOS image files.

Cisco creates a separate IOS for each series of routers. Because of this, each IOS works only on the router belonging to that series. The first term indicates the series of routers for which the IOS file is compiled. The word 'c1841' indicates that this IOS file is compiled for the 1841 series routers.

Besides the base features, each IOS contains some special add-on features. The next term represents these features. The word 'advipservices' indicates that this IOS contains special security features for advanced IP services. The trailing 'k9' indicates that this IOS supports encryption.

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