Question 51
A broadcast and an NBMA network, each having two or more routers, must both have a DR and a BDR.
A. True
B. False
Question 52
ABRs advertise link status information about connected non-backbone areas to the backbone area. The backbone area then advertises the routing information to other non-backbone areas. Link status information about the backbone area cannot be advertised to non-backbone areas.
A. True
B. False
Question 53
OSPF directly runs over the IP protocol. Its IP protocol number is 89.
A. True
B. False
Question 54
Which of the following statements about link aggregation are true? (Choose three.)
A. Link aggregation binds a group of physical interfaces together as a logical interface to increase the bandwidth and reliability.
B. Link aggregation complies with IEEE 802.3az.
C. The logical link formed by bundling multiple physical links together is called a link aggregation group (LAG) or a trunk.
D. Active and inactive interfaces exist in link aggregation. Active interfaces forward data, whereas inactive interfaces do not.
Question 55
When links are switched in a Smart Link group, which of the following mechanisms can be used to refresh MAC and ARP entries? (Choose three.)
A. MAC and ARP entries are refreshed automatically with respect to traffic.
B. The Smart Link group uses a new link to send Flush packets.
C. MAC entries are refreshed after the aging time expires.
D. ARP entries are refreshed after the aging time expires
Question 56
Which of the following statements about the BFD asynchronous mode are true? (Choose two.)
A. The local system regularly sends BFD control packets, and the remote system detects the BFD control packets sent from the local system.
B. The local system detects the BFD control packets sent by itself.
C. If one system does not receive any BFD packets from its peer within a detection period, it advertises a session Down event.
D. Each system confirms its connections with other systems in a particular method. After a BFD session is set up, BFD control packets are no longer sent.
Question 57
Routes 172.1.12.0/24, 172.1.13.0/24, 172.1.14.0/24, and 172.1.15.0/24 can be summarized into route 172.1.8.0/21.
A. True
B. False
Question 58
Which of the following statements are true? (Choose three.)
A. The neighbor state machine can transition from the Down state to the Exchage state.
B. The neighbor state machine can transition from the Down state to the Init state.
C. The neighbor state machine can transition from the Init state to the Exstart state.
D. The neighbor state machine can transition from the Init state to the 2-Way state.
Question 59
A router receives a data packet, with the destination address being 195.26.17.4. Which subnet is this address in?
A. 195.26.0.0/21
B. 195.26.16.0/20
C. 195.26.8.0/22
D. 195.26.20.0/22
Question 60
Which of the following statements about the reliability requirement level are true? (Choose three.)
A. Faults seldom occur in the system software or hardware.
B. System functions are affected by faults.
C. System functions are affected by faults but can rapidly recover.
D. System functions can be ensured by using redundancy design, switchover policy, and high success rate in switchover.
