If I were to assign ports on A B and C to one or more tagged VLANs,
how would ports on a given VLAN communicate if the trunk ports are
assigned to an untagged VLAN?
(If I'm writing gibberish, pls note the 'Newbie Alert' designator in
the subject.)
Look for the procurve manuals, printed or PDFs from hp.com. Seriously.
They have really good docs on this stuff that makes sense, and it's easy
reading too.
HP doesn't use stupid improbable examples like cisco does for everything,
where they explain what a VLAN is, and then in the next example they're
routing DECnet and apple talk across some corporate VPN using 56k lines.