H3CSE-RS-SW Sample Questions:

1. There are multiple IGMPv2 group member hosts (Client1/Client2/Client3) in the shared network segment, and there are also multiple IGMPv2 routers (Router1/Router2) as shown below:

Then, which of the following statement is correct? (Multiple choice)

A) Only Router1 periodically sends general group queries to the shared network segment
B) Router1 and Router2 periodically send general group queries to the shared network segment
C) After the host receives the general group query message, Client1, Client2, and Client3 may all send Report messages.
D) Only Router2 periodically sends general group queries to the shared network segment
E) After the host receives the general group query message, after the first host sends a Report message, the Report messages of other hosts are suppressed
F) After the host receives the query message, only the Clients send Report messages

2. The mechanisms of the multicast group management protocol mainly include? (Multiple choice)

A) Router maintenance multicast group
B) Hosts joining and leaving multicast groups
C) Member Report Suppression Mechanism
D) Querier Election

3. In the PIM-DM network shown in the figure, some unicast routing tables of routers RT1 and RT2 are as follows:
<RT1>display ip routing-table Routing Tables: Public
Destination/MaskProtoPreCost NextHop Interface 1.1.0.0/16xxxxP1-1 C1-1 10.1.1.1Port1
1.1.1.0/24xxxxP1-2 C1-2 10.1.1.1Port1
<RT2>display ip routing-tableRouting Tables: Public
Destination/MaskProtoPreCost NextHop Interface 1.1.1.0/24XXXX P2-1 C2-1 11.1.1.1Port2
1.1.1.1/32XXXX P2-2 C2-2 11.1.1.1Port2

Then, when routers RT1 and RT2 perform Assert, the winner should be? (Multiple choice)

A) If P1-2>P2-2, C1-1<C2-2, then RT2 wins.
B) If P1-2=P2-2, C1-2=C2-2, then RT2 wins.
C) If P1-1=P2-2, C1-1<C2-2, then RT1 wins.
D) If P1-1=P2-2, C1-1=C2-2, then RT1 wins.
E) If P1-1>P2-2, C1-1<C2-2, then RT1 wins.
F) If P1-2=P2-2, C1-2<C2-2, then RT2 wins.

4. Regarding the STP port status, which of the following is correct? (Multiple choice)

A) When the port is in the Listening state or the Learning state, if the port role changes to an Alternate port, the port state will directly change to Blocking.
B) When the port is in the Listening state, it will receive configuration BPDUs and perform calculations, but will not send configuration BPDUs.
C) When the port is in the Learning state, it starts learning MAC addresses but does not forward data.
D) Regardless of the role the port ultimately determines, the time it stays in the Listening state and the Learning state is the length of one Forward Delay.

5. As shown in the figure, SWA and SWB enable STP, and SWC does not enable STP. Initially, link 2 is not connected, and PCB can send data to PCA. If link 1 fails at this time, the maintenance personnel connect link 2. Which of the following statement about the recovery process of data transmission from PCB to PCA is (assuming that PCA will not actively send data) is correct?

A) Since the SWA link interruption will trigger the topology change process, the MAC address aging time of SWA and SWB will be shortened, so the service recovery takes 15 seconds by default.
B) When SWB port EO/1 enters the Forwarding state, it triggers the topology change process, so the service will eventually recover in the default time of 30+15=45 seconds.
C) Since SWB port EO/1 takes 30 seconds to enter the forwarding state by default, the service takes 30 seconds to recover by default.
D) Service recovery requires waiting for the MAC address of the SWC to age, so the default time is 300 seconds.

Solutions: