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Posted by Bob by the Bay on May 4, 2005, 3:10 pm
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Saad,
Normally I would say A only. That's probably the answer that would be
considered correct. But I have to qualify that in real life.
I set up router r1 with RIPv1/IOS 12.1(9) just like your example (int e1 is
substituted for your s1) and made sure the connected routers were able to
ping.
Observed: RIP only sends/receives updates from the interface covered by the
NET statement. The default route is not included in any RIP updates. And
surprise - updates to e0 are generated BUT SUPPRESSED as there aren't any
routes to send (the connected route doesn't need to be sent).
See below.
Robert
r1#deb ip rip
r1#sh ip route
.
..
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.1.0 is directly connected, Ethernet1
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Ethernet0
S* 0.0.0.0/0 is directly connected, Ethernet1
r1#
00:28:52: RIP: sending v1 update to 255.255.255.255 via Ethernet0 (10.1.1.1)
00:28:52: RIP: build update entries - suppressing null update
00:29:19: RIP: sending v1 update to 255.255.255.255 via Ethernet0 (10.1.1.1)
00:29:19: RIP: build update entries - suppressing null update
> interface serial 0
>
> ip address 172.16.1.1 255.255.255.0
>
> !
>
> interface ethernet 0
>
> ip address 10.1.1.1 255.255.255.0
>
> !
>
> router rip
>
> network 10.0.0.0
>
> !
>
> ip route 0.0.0.0 0.0.0.0 serial0
>
> !
>
> As per the output above, which of the following is true?
>
> A. RIP updates are sent and received on interface serial 0 of the router
>
> B. A default route is sent to neighbors on interface serial 0 of the
> router
>
> C. A default route is sent to neighbors on interface ethernet 0 of the
> router
>
> D. RIP updates are sent and received on interfaces serial 0 and ethernet 0
> of the router
>
>
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