I forgot to include my thoughts and discoveries before hitting the send key.
Anyway, in researching my conclusion of the original question I found
something I thought might be of interest to all. On pg. 320-322 of Bassam
Halabi's - Internet Routing Architectures we get a good(awesome) explanation
of the networks command and it confirms my belief that question did not
provide the correct answer to be chosen from.
Basically, Halabi's book states, networks that fall on the major net
boundary (255.0.0.0, 255.255.0.0, 255.255.255.0) do not need to have the
mask included. However, the question requires that
>1. Which command allows Router A to advertise subnet 10.1.0.0/24 in BGP?
be advertised. In order to get this done it would require the mask
255.255.255.0, otherwise the major net boundary would 10.0.0.0/8, which
would not meet the requirements of the question.
thoughts anyone?
Nigel..
----- Original Message -----
From: Chuck Larrieu <[EMAIL PROTECTED]>
To: Jay Hennigan <[EMAIL PROTECTED]>
Cc: Peter Abraham <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Sunday, September 24, 2000 5:21 PM
Subject: RE: BGP **** CCO QUESTION ** PA
> Saved this one until I could take a look on a router. Some comments
within:
>
> >1. Which command allows Router A to advertise subnet 10.1.0.0/24 in BGP?
> >
> > A. network 10.1.0.0
> > B. network 10.1.0.0 255.255.0.0
> > C. network 10.1.0.0 mask 255.255.0.0
> > D. network 10.1.0.0/16
> * E. network 10.1.0.0 prefix 16
>
> We've already determined that B, D, and E are illegal commands
>
> A, which I mistakenly believed would work does not do anything on my
router.
>
> Router_3#sh ip bgp
> BGP table version is 7, local router ID is 3.3.3.3
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> *> 192.167.9.0 0.0.0.0 0 32768 i
> *> 199.199.199.0 0.0.0.0 0 32768 I
>
> IP Classless was configured.
>
> Relevant parts of the config:
>
> interface Loopback0
> ip address 10.1.1.1 255.255.0.0
> !
> interface Loopback1
> ip address 192.167.9.1 255.255.255.0
> !
> interface Loopback4
> ip address 199.199.199.1 255.255.255.0
>
> router bgp 100
> no synchronization
> bgp router-id 3.3.3.3
> network 10.1.0.0
> network 192.167.9.0
> network 199.199.199.0
> !
> ip classless
> ip route 0.0.0.0 0.0.0.0 Serial1
>
> yes I did a clear ip bgp * between config changes
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Jay
> Hennigan
> Sent: Monday, September 18, 2000 7:20 PM
> To: Chuck Larrieu
> Cc: Peter Abraham; [EMAIL PROTECTED]
> Subject: RE: BGP **** CCO QUESTION ** PA
>
> On Mon, 18 Sep 2000, Chuck Larrieu wrote:
>
> > Having just exited a three day Global Knowledge class on BGP, let's see
if
> > anything sunk through this thick skull of mine. Comments in line.
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> > Peter Abraham
> > Sent: Thursday, September 14, 2000 2:02 PM
> > To: [EMAIL PROTECTED]
> > Subject: BGP **** CCO QUESTION ** PA
> >
> > All these are questions that I got from the CCO BCSN tests.
> >
> > 1. Which command allows Router A to advertise subnet 10.1.0.0/24 in BGP?
> >
> > A. network 10.1.0.0
> > B. network 10.1.0.0 255.255.0.0
> > C. network 10.1.0.0 mask 255.255.0.0
> > D. network 10.1.0.0/16
> > E. network 10.1.0.0 prefix 16
> >
> > I have my answer as A. B,D, and E all have the wrong syntax. Is C
right?
> I
> > know that the mask length for C is 16.
>
> Jay H:I would choose C. The wording of the question is "allows Router A
to
> advertise". Note that none of the answers LIMIT the advertisement to
> just the subnet 10.1.0.0/24. If no mask is specified, BGP assumes a
> classful network. Answer A has no mask, so should properly be written
> "network 10.0.0.0". C is the only properly-formatted answer which
> would allow the /24 subnet. It would also allow any other subnets of
> 10.1.0.0/16 to be advertised, which is ok.
>
> CL: folks as literal minded as myself often outsmart themselves with
> questions like this. Kinda like my network 0.0.0.0 255.255.255.255 area 0
or
> network 172.16.1.1 172.16.1.1 area 0 propositions in OSPF. There is an
> answer that does what the question asks, plus a whole lot more.
>
> Note: even assuming BGP defaults to the classful boundary, the network
> 10.0.0.0 does NOT appear in the BGP table if the network statement
indicates
> 10.1.0.0
>
> <<snip for brevity>>
>
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