最新的高品質 H12-821_V1.0-ENU 考試練習題庫

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問題 #1

Which of the following descriptions is wrong about the address function of NDP?

A. The address realizes the function from IPv6 address to link layer address
B. Two types of ICMPv6 packets, neighbor solicitation and neighbor advertisement, are used in the addressing process.
C. When sending a Neighbor Solicitation message, the source address is set to be the link-local address of the local interface
D. When sending a Neighbor Solicitation message, the destination address is set as the multicast address of the requested node of the neighbor

問題 #2

A company has a stack system consisting of three switches that is running stably. Now the main switch has restarted due to a fault.
Which of the following descriptions of this phenomenon are incorrect? (Multiple choice)

A. After the original master switch is restarted, the original backup switch will become the new slave switch.
B. After the original master switch is restarted, the original master switch will become the new master switch.
C. Before the original master switch is restarted, the original slave switch will be designated as the new backup switch.
D. Before the original master switch is restarted, the original backup switch will be upgraded to the new master switch.

問題 #3

In PIM, which of the following descriptions about DR is correct? (Multiple choice)

A. If the current DR fails, the PIM neighbor relationship will time out, and a new round of DR election will be triggered between other PIM neighbors.
B. PIM routers become PIM neighbors by exchanging Hello messages. The Hello messages carry the DR priority and the interface address of the network segment.
C. On the shared network segment of the connection group members, the DR is responsible for sending a Register message to the RP. The DR connected to the group members is called the group member-side DR.
D. On the shared network segment connected to the multicast source, the DR is responsible for sending Join registration messages to the RP. The DR connected to the multicast source is called the source DR.

問題 #4

Routers R1 and R2 establish an OSPF neighbor relationship. When R1 receives an LSU message from R2, which of the following methods will it use to inform R2 that it has received the LSU?

A. R1 will transmit the TCP packet with the ACK bit set to 1 to R2
B. R1 will respond with LSAck message to R2
C. R1 will return the LSU with the same serial number to R2
D. R1 will respond to R2 with a DD message, in which the sequence number of the LSA header is the same as that of the LSU

問題 #5

After dual-machine hot backup is configured, the primary and backup channels cannot be established. The information on the primary device cannot be normally backed up to the backup device, resulting in abnormal dual-machine hot backup. What is the possible cause of this failure? (Multiple choice)

A. The source IP address and source port number of the local end are inconsistent with the destination IP address and destination port number of the peer end.
B. The priorities of the two ACs are the same
C. The retransmission times and retransmission intervals of the active and standby service packets at both ends are inconsistent
D. The TCP channel is not established

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