Nokia 4A0-C04 問題集

質問 1：
When are virtual links used in OSPF?
A. When two areas are connected to area 0, but there is no direct path between them.
B. When two areas need to communicate and there is no area 0.
C. When an area needs to connect directly to another area without using area 0.
D. When an area needs to traverse another area to reach area 0.
正解：D

質問 2：
Which of the following devices inspects the MPLS header in the received packet, and exchanges it for a new MPLS header?
A. LER
B. PE
C. eLER
D. LSR
E. iLER
正解：D

質問 3：
Which of the following defines an FEC in traditional IP?
A. A group of packets that arrive at the router on the same interface,
B. A group of packets that arrive at the router on the same interface, from the same source.
C. A group of packets that will be forwarded by the router in the same manner, over the same path.
D. A group of packets that leave the router on the same interface.
正解：C

質問 4：
Which of the following statements regarding OSPF routing updates on a point-to-point link is true?
A. On a point-to-point link, a DR and BDR are elected. To ensure resiliency, both the DR and BDR send link-state advertisements describing the network.
B. On a point-to-point link, there is no need for a DR and BDR election; all routing updates are sent to
224.0.0.5.
C. On a point-to-point link, there is no need for a DR and BDR election. All routing updates are sent to the unicast address of the neighbor's interface.
D. On a point-to-point link, a DR and BDR are elected. The DR sends link-state advertisements describing the network.
正解：B

質問 5：
Which of the following statements apply to link state protocol behavior? Choose three answers.
A. An adjacency database is maintained by each router.
B. Routers broadcast the entire route table to all neighbors.
C. The topological database is the same for all routers in a single area.
D. Information about directly connected links is sent to all neighbors.
E. The sequence number for an update is incremented as it is flooded from router to router.
正解：A,C,D

質問 6：
Click the exhibit.

Routers RR1 are RR2 are redundant route reflectors for clients R3 and R4. Which of the following is a valid configuration on router RR1?

A. Option A
B. Option C
C. Option D
D. Option B
正解：B

質問 7：
When an OSPF adjacency is stuck in the "ExchStart" state, what is the most likely cause?
A. A OSPF Hello has not been received from the neighbor
B. The Router ID is the same on both routers
C. The MTU does not match on both interfaces
D. OSPF is not enabled on one of the routers
正解：C

質問 8：
Which of the following about the Link LDP discovery process on the Nokia 7750 SR is FALSE?
A. LDP Hello messages are exchanged between all directly connected LDP enabled routers.
B. LDP Hello messages are sent to the All Routers address 224.0.0.2.
C. LDP Hello messages are sent over TCP.
D. Each LDP enabled router must have its own unique system IP address.
正解：C

質問 9：
A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each. Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?
A. 12
B. 15
C. 13
D. 14
正解：B