What are the OSPF message types? (Choose four.)
A. Hello
B. Database Description
C. Link State Request
D. Link State Update
E. Link State Advertisement
Which of the following statements are correct regarding Network LSA in OSPF network? (Choose two.)
A. Network LSA is generated by ABR.
B. Only the router which connects NBMA or Broadcast Network may generate Network LSA.
C. DR uses Network LSA to describe routers that have established adjacency relation with it in the network.
D. Network LSA is flooded in the whole AS.
A broadcast and an NBMA network, each having two or more routers, must both have a DR and a BDR.
A. True
B. False
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
OSPF directly runs over the IP protocol. Its IP protocol number is 89.
A. True
B. False
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.
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
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.
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
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.
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