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CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

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184 Switching Basics <strong>and</strong> Intermediate Routing <strong>CCNA</strong> 3 <strong>Labs</strong> <strong>and</strong> <strong>Study</strong> <strong>Guide</strong><br />

What comm<strong>and</strong> generates the following output?<br />

Router#debug ip rip<br />

00:29:04: RIP: received v2 update from 192.168.1.253 on Serial0/0<br />

00:29:04: 192.168.1.64/26 via 0.0.0.0 in 2 hops<br />

00:29:04: 192.168.1.128/26 via 0.0.0.0 in 1 hops<br />

00:29:04: 192.168.1.248/30 via 0.0.0.0 in 1 hops<br />

00:29:05: RIP: sending v2 update to 224.0.0.9 via FastEthernet0/0 (192.168.1.1)<br />

00:29:05: RIP: build update entries<br />

00:29:05: 192.168.1.64/26 via 0.0.0.0, metric 2, tag 0<br />

00:29:05: 192.168.1.128/26 via 0.0.0.0, metric 2, tag 0<br />

00:29:05: 192.168.1.244/30 via 0.0.0.0, metric 1, tag 0<br />

00:29:05: 192.168.1.248/30 via 0.0.0.0, metric 2, tag 0<br />

00:29:05: 192.168.1.252/30 via 0.0.0.0, metric 1, tag 0<br />

00:29:05: RIP: sending v2 update to 224.0.0.9 via Serial0/0 (192.168.1.254)<br />

00:29:05: RIP: build update entries<br />

00:29:05: 192.168.1.0/26 via 0.0.0.0, metric 1, tag 0<br />

00:29:05: 192.168.1.64/26 via 0.0.0.0, metric 2, tag 0<br />

00:29:05: 192.168.1.244/30 via 0.0.0.0, metric 1, tag 0<br />

Using the preceding output, answer the following questions.<br />

How many RIP neighbors does this router have?<br />

From the output, only one, at 192.168.1.253<br />

Notice that this router sent two updates. How many routes did RIP advertise out FastEthernet0/0?<br />

Five<br />

How many routes did RIP advertise out Serial0/0?<br />

Three<br />

What routes that were advertised out Fa0/0 were not advertised out S0/0?<br />

192.168.1.252/30 <strong>and</strong> 192.168.1.128/26<br />

Why do you think these routes were not advertised out the S0/0 interface?<br />

Because split-horizon prevents a router from sending out updates about networks to another router if the<br />

router receiving the update is the one that originally advertised the route. In this case, the route heard<br />

about the 192.168.1.128/26 network from the router it is sending the update to. In addition, if two routers<br />

share a network, then neither router needs to advertise the route to the other router. That is the case with<br />

the 192.168.1.252/30 network.<br />

Is it necessary to advertise out the Fast Ethernet interface? If not, what can you do to stop advertisements?<br />

If so, why?<br />

The only reason to advertise out the Fast Ethernet interface is if there is another RIP router that needs<br />

updates out that interface. Otherwise, it is best to turn off updates on Fast Ethernet interfaces by using the<br />

passive-interface comm<strong>and</strong>.

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