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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