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- BSCI question
- Saad Ahmed
May 4, 2005, 7:01 pm
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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
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
D. RIP updates are sent and received on interfaces serial 0 and ethernet 0
of the router
Re: BSCI question
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
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).
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
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
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