See Inline:
> 1) What is the size of a token ring frame?
> My answer: Token ring has a variable frame size.
> His answer: 3 bytes..
>
> Isn't that the size of the Token frame?
There are 3 Token Frame Fields
- Start Delimiter
- Access-Control Byte
- End Delimiter
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/tokenrng.htm
(Watch the word wrap)
>
> 2) What the MTU of a token ring frame? (Isn't this
> about the same question as #1?)
> My answer: slightly larger that 16K (I couldn't
> remember the exact number)
> His answer: about 4470 bytes .
>
> Ahh... what? He claimed I was thinking about
> FDDI.grrrr Ah. Who's thinking about what?
That is variable, but check here:
http://www.cisco.com/warp/public/482/11.html
> 3) What is the decision making process involved when a
> packet enters a router? What three criteria are used
> to make this decision?
> My answer: It depends. Is this the first
> packet with this destination to arrive at this router?
> What switching mode is the router configured for.
>
> His answer: Forget about that stuff. how does
> it determine which route to use.
Hang on here... Did we go from 1 question (what is the decision
making process...) to another question (how does it determine
which route to use)?
>
> My answer: longest match in the routing table
Good answer
>
> His answer: What if multiple routes exist in
> the table.
Ouch
>
> My answer: It depends.
>
> Ok...I'm gonna cut to the chase. The answer he
> wanted was longest match, Administrative distance,
> then metric. Ahh.. I'm pretty sure is wrong. The
> router looks at AD and Metrics long before the packet
> enters the router. The router uses AD and metric to
> populate the routing table, and then longest match
> from the routing table to make the decision once the
> packet actually enters the router. Comparing AD and
> metric on every known route every time would place
> unnecessary burden on the CPU. Compare it once, make
> the decision, and enter it in the RIT. Even in the
> case of IGRP/EIGRP with variance, the next eligible
> route is determined before the packet enters the
> router.
>
Well, that's kind of a crappy question, IMHO. Maybe he was just
trying to get an idea of your thought process.
Consider it a learning experience.
btw. How much T/R does this guy use/run into? He sounds like
the CCIE written.
Bob
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