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The following command is configured on a device: [sysname] port-security enable Which of the following is an incorrect description of the function and meaning of this configuration?
(Multiple choice)

• A. The function implemented by this configuration can only control the access of unauthorized devices to the network by detecting the source MAC address in the data frame.
• B. The function implemented by this configuration can only control the access of unauthorized devices to the network by detecting the destination MAC address in the data frame.
• C. This configuration enables the port security feature
• D. The purpose of this configuration is to enable the device to learn the legal destination MAC address to achieve network management

In PIM-DM networking, which of the following is correct about the router sending the Prune message?

• A. When the router has no local directly connected multicast receiver, it sends a Prune message to all PIM neighbors.
• B. After the router interface receives the Prune message, it will no longer send messages of the corresponding multicast group on this interface.
• C. When the outbound interface list in the router (S, G) table is empty, a Prune message is sent to all PIM neighbors.
• D. The party that fails the Assert will send a

There are multiple IGMPV2 group member hosts (Client1/Client2/Client3) and multiple IGMPv2 routers (Router1/Router2) in the shared network segment, as shown in the following figure:

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

• A. Only Router2 periodically sends general group queries to the shared network segment
• B. After the host receives the query message, only Client1 sends a Report message
• C. After the host receives the general group query message, Client1 sends a Report message to join group A, which will not suppress Client2's Report message to join group B.
• D. Router1 and Router2 periodically send general group queries to the shared network segment
• E. After the host receives the general group query message, Client1, Client2, and Client3 may send the same
• F. Only Router1 periodically sends general group queries to the shared network segment

In the network connection shown in the figure, SWA and SWB are three-layer switches, running STP+VRRP, and after the initial configuration is completed, SWA is the root of STP and the Master of VRRP. SWC is a two-layer switch connected to the terminal. Which of the following description of the network link failure is correct? (Multiple choice)

• A. When only the link between SWB and SWC is intact, the VRRP Master will remain unchanged, but the SWC downstream terminal cannot communicate with the gateway.
• B. When the link between SWB and SWC is disconnected, the port status on the remaining STP links does not change and remains Forwarding.
• C. When the link between SWB and SWC is disconnected, the VRRP Master will remain unchanged and the SWC downstream terminal can still communicate normally.
• D. When only the link between SWB and SWC is intact, SVVA and SWB will become the Master of VRRP, and the lower end of SWC can communicate normally with the gateway.

What is the purpose of deploying SSH in the campus network? (Multiple choice)

• A. Build a private network, provide tunneling, encryption and message authentication
• B. Implement server authentication of users
• C. Prevent remote connection attacks
• D. When logging into the device remotely, it can ensure that the device is not attacked by IP fraud, plain text password interception, etc.