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H3C Constructing H3C High-Performance Campus Networks Sample Questions:

1. In the switching network as shown in the figure, VLAN 10 is set as Super VLAN on the switch SWA, VLAN 2 and VLAN 3 are Sub VLANs of VLAN 10, Port Ethernet1/0/3 is Trunk port, PVID is VLAN 1, allowing all VLANs to pass ; Create VLAN2~VLAN20 on the switch SWB, port Ethernet1/0/4 as Trunk port, PVID is VLAN1, allowing all VLANs to pass, after setting the IP address of each device as shown in the figure, check the MAC address table on SWB , It can be judged that PCA belongs to

A) VLAN 1
B) VLAN 10
C) VLAN3
D) VLAN2

2. As shown in the network topology, if STP is enabled on SWA and SWD, the statement about SWA and SWD port status changes is correct.

A) If i sets the bridge priority of SWD to 0, the role of SWA port E0/1 will be changed from a designated port to a root port, and the port will remain in the Forwarding state during the transition.
B) If the cost value of the SWD port EO/2 link is changed to 100, the port E0/2 will immediately turn into the new root port and enter the Forwarding state
C) If the SWD bridge priority is set to 0, the SWD ports E0/1 and E0/2 will enter the Forwarding state after going through the Listening state and the Learning state
D) SWD port EO/1 will change from designated port to root port in the Listening state

3. The following statements about the PIM SM registration suppression timer are correct (choose one or more)

A) The DR router of the multicast source will maintain a registration suppression timer. If the timer expires, the DR will unicast multicast source registration messages to the RP
B) After receiving the registration stop message, the DR will update the registration suppression timer and continue to send data in multicast mode
C) To prevent the registration suppression timer from expiring, the DR will send the Register message encapsulating the multicast data to the RP before the timer expires
D) After the RP receives the registration message from the DR, it will send a registration stop message and update the local (S, G) and (*, G) entries

4. Regarding the comparison of RSTP and STP BPDU processing methods, the correct statement is

A) The aging time of RSTBPDU is reduced from Max age to 3 consecutive Hello Time durations
B) After the RSTP switch receives the configuration BPDU, the calculation and comparison method of the priority vector is the same as that of STP
C) RSTP follows the way of sending configuration BPDUs in STP, and configuration BPDUs are only sent periodically by the root bridge
D) In RSTP, a blocked port can respond immediately when it receives a ground-first BPDU

5. Routers running PIM-DM will periodically send Hello messages to discover neighbors, establish and maintain neighbor relationships. The following descriptions of Hello messages are correct. __

A) The router sends PIM Hello in multicast mode, the destination address is 224.0.0.13
B) When the DR is elected, the router with the higher priority of the Hello message will become the DR
C) If the remaining routers do not receive the Hello message sent by the DR within the timeout period, a new DR election process is triggered
D) If Hello messages have the same priority, the router with the smaller interface IP address will become the DR
E) When there are multiple routers running IGMPV1 on the shared network segment, the DR is elected for the shared network segment through the PIMHello message, and the DR serves as the Querier of IGMP

Solutions: