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CCNP ROUTE Practice Exam:

5 (More) Questions On BGP

By Chris Bryant, CCIE #12933

BGP is a huge topic on the CCNP ROUTE exam, so expect to see additional CCNP ROUTE practice exams in the near future on BGP!

You'll find the answers at the bottom of the page...

... and you'll also find three free hours of CCNP Video Boot Camp training!

Let's get to the questions!

1. Briefly describe the term multihoming.

2. Identify the optional transitive BGP attributes.

A. next-hop

B. AS_PATH

C. LOCAL_PREF

D. aggregator

E. MED

F. origin

G. community

3. A BGP route reflector receives a route from a nonclient peer. What will the RR do with this route?

A. Advertise it to its clients and nonclients as well.

B. Advertise it to its clients only.

C. Keep the route to itself and not advertise it at all.

D. Advertise it only to other nonclients.

4. One reason we configure BGP route reflectors is to avoid the overhead of a full mesh. For example, if you have 10 routers in a BGP as, how many separate BGP peer connections would you need for a full mesh?

5. With our routing protocols such as RIP, EIGRP, and OSPF, we're always concerned about how often full updates are exchanged. How often does that happen with BGP?

A. When there's a change in the network topology.

B. Every 90 minutes.

C. Only right after the adjacency is formed.

D. Every 30 seconds.

E. At a fixed interval not listed here.

Answers right after this brief and important message!

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And now ... the answers!

1. Multihoming is the process of connecting multiple ISPs to a single AS via BGP.

2. (D, G). Community and aggregator are the two transitive optional BGP attributes. MED is the only optional non-transitive attribute.

3. (B). When a BGP route reflector receives a route from a nonclient peer, that route will be reflected only to that route reflector's clients -- not to any other nonclients.

4. To calculate the number of separate TCP connections you'll need for a logical full mesh in a BGP AS, use this formula:

x (x-1) / 2, where x = the overall number of routers

With 10 routers, you will need 45 separate TCP connections. Which is one reason we really like route reflectors!

5. (C). BGP peers exchange updates immediately after an adjacency is formed. After that, updates are sent only after there's a change in the network, and those updates reflect only the changes.

Great work! Now let's get to those three free hours of CCNP Video Boot Camp training...