Question 111
Which of the following statements about BFD control packets are true? (Choose three.)
A. A BFD control packet is encapsulated in a UDP packet for transmission. Authentication fields in a BFD control packet are optional.
B. BFD detection is not available in VRP 5.7.
C. Echo packets use UDP destination port number 3784.
D. Echo packets use UDP destination port number 3785.
Question 112
Which of the following elements together uniquely identify a LSA? (Choose three.)
A. LS type
B. Link state ID
C. Advertising Router
D. LS Sequence number
Question 113
The address space 172.28.100.0/24 is currently used. If the subnet mask 172.28.100.0/30 is used to divide this address space into several subnets serving WAN links, how many subnets in total can the address space be divided into?
A. 30
B. 64
C. 126
D. 254
Question 114
An OSPF neighbor relationship fails to be established and the display ospf error command output is as follows.Which of the following is the possible cause?
A. Router IDs conflict.
B. Area IDs are mismatched.
C. Network masks are inconsistent.
D. Authentication types are inconsistent.
Question 115
OSPF supports two authentication modes: area authentication and interface authentication.The two authentication modes cannot be configured at the same time.
A. True
B. False
Question 116
A Router ID is optional in the OSPF configuration.
A. True
B. False
Question 117
Which statement about OSPF is false?
A. Hello packets are used to discover and maintain neighbor relationships. On a broadcast network or an NBMA network, Hello packets can also be used to elect a DR and a BDR.
B. DD packets describe summary LSDB information by carrying LSA headers.
C. The intervals at which two routers send Hello packets must be consistent; otherwise, a neighbor relationship cannot be established between them.
D. DD packets contain headers of all LSAs for periodic LSDB synchronization between OSPF neighbors.
Question 118
A device can be assigned an IP address 192.168.13.175, with the mask being 255.255.255.240.
A. True
B. False
Question 119
Which of the following statements about OSPF authentication are false? (Choose two.)
A. Entering a password in cipher text is allowed.
B. The ospf authentication-mode md5 1 huawei command and the ospf authentication-mode md5 1 plain huawei command have the same function.
C. If passwords are configured for both an area and an interface, the password configured for the area is used.
D. The ospf authentication-mode simple huawei command and the ospf authentication-mode simple plain Huawei command have the same function.
Question 120
Which of the following rules should a network administrator obey when the network administrator uses the VLSM technology to plan subnets? (Choose three.)
A. A subnet is composed of all summarized routes.
B. A subnet can address a host or be further subnetted.
C. The Update message of a routing protocol in use must carry subnet mask information.
D. The summarized networks must have the same high-order bit.
