----- Original Message -----
From: "John Barnes" <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
Sent: Sunday, September 17, 2000 11:48 PM
Subject: Re: Help about a technical interview I had PLEASE!
> 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.
Oops...the maximum is 18k. I'll go with Priscilla's answer over that of Mr.
Giles :)
>
>
> >
> > >
> > > 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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