See comments below.
--- "David L. Blair" <[EMAIL PROTECTED]> wrote:
>
> > 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?
>
> Yes.
>
> >
> > 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 .
>
> He is correct.
No, he isn't. Token ring has a variable MTU.
>
> >
> > Ahh... what? He claimed I was thinking about
> > FDDI.grrrr Ah. Who's thinking about what?
> >
> > 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.
>
> Most routers actually do not switch that requires a
> switching module in the
> router. Since routers have to make a routing
> decision on a packet, by
> default a router reads the whole packet before it
> makes a decision that is
> why routers forward packets slower than a switch. A
> switch is basically a
> fixed function bridge that can have one of three
> modes: Cut Through, Store
> and Forward, or Fragment Free.
>
Actually, every router does. Unless you disable it
with a no ip-route cache on the interface, almost
every Cisco router does fast switching by default.
This means the first packet is checked against the
routing information base, then subsequent packets
recieved on the same interface with the same
destination are fast switched using the route cache,
not process switched. Regardless, the first packet
received for a given destination on an interface is
ALWAYS process switched.
> >
> > His answer: Forget about that stuff. how
> does
> > it determine which route to use.
> >
> > My answer: longest match in the routing
> table
> >
> > His answer: What if multiple routes exist
> in
> > the table.
> >
> > My answer: It depends.
> >
>
>
> > Maybe I should have picked up on this stuff
> when
> > the recruiter asked me with BGP was a DV or LS
> based
> > routing protocol. My answer. ahh.neither, it's
> path
> > vector.
>
> BGP is an External Gateway Protocol which most
> closely resembles DV.
>
BGP is a Path Vector routing protocol, although it
more closely resembles a DV, it is not.
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