4A0-102

4A0-102 practice questions, page 5 of 6, with answer review and explanations.

Question 21

A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following export policy. The "aggregate 192.168.0.0/16" command is executed. What is the effect of this configuration?

  1. A single route for 192.168.0.0/16 is advertised.
  2. BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.
  3. BGP routes 192.168.1.0/27 and 192.168.2.0/27 are advertised, and 192.168.0.0/16 appears as a "Blackhole" route in the route table only.
  4. The given export policy is invalid.

Question 22

When an Alcatel-Lucent 7750 SR receives a BGP route with an AS Path loop, what action is taken by default?

  1. The route is ignored.
  2. The route is flagged as invalid and placed in the LOC-RIB.
  3. The route is flagged as invalid and placed in the RIB-In.
  4. The route is flagged as invalid and placed in the RIB-Out.

Question 23

What happens to a route that is rejected by an import policy on an Alcatel-Lucent 7750 SR?

  1. The route is discarded.
  2. The route is kept in the RIB-In, but marked as an invalid route.
  3. The route is moved to the LOC-RIB, but not marked as a used route.
  4. The route is moved to the route table, but not to the FIB.

Question 24

A router receives two routes from its neighbors: a route from OSPF for 10.0.0.0/24, and a route from BGP for 10.0.0.0/8. Both routes have reachable next hops. Which of the following is TRUE?

  1. Only the BGP route is in the route table.
  2. Both routes are in the route table.
  3. None of the routes is in the route table.
  4. Only the OSPF route is in the route table.

Question 25

Click the exhibit. AS 65550 owns CIDR block 10.64.0.0/12. Router R3 is advertising Client1 and Client2 networks into BGP. Router R6 advertises the aggregate 10.64.0.0/12 to AS 65541 with "summary-only" enabled. Which of the following routes are received by router R7?

  1. Client1, Client2 and the aggregate.
  2. Only the aggregate.
  3. Only Client1 and the aggregate.
  4. Only Client2 and the aggregate.