As shown in the figure, the APLS LSP is configured in the network and the goal is to establish an LDP session between SWA and SWB, then which of the following statement is correct?

• A.The mpls lsr-id of the two devices cannot be configured in the same way
• B.No need to enable MPLS globally
• C.No need to enable MPLS on the port
• D.Configured correctly

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In order to prevent hackers from attacking user devices or networks through MAC addresses, the MAC addresses of untrusted users can be configured as black hole MAC addresses to filter out illegal MAC addresses.

• A.FALSE
• B.TRUE

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The session-based stateful inspection firewall has different processing flows for the first packet and subsequent packets. Which of the descriptions of the flow is correct? (Multiple choice)

• A.When the stateful inspection mechanism is enabled, when the firewall processes TCP packets, only SYN packets can establish a session.
• B.When the state check mechanism is turned on, subsequent packets also need to be checked for security policies.
• C.When a packet arrives at the firewall, it will look up the session table. If there is no match, the firewall will process the first packet.
• D.When the packet reaches the firewall, it will look up the session table, and if it matches the firewall, the subsequent packet processing process will be performed.

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Deploying port isolation technology in Ethernet can realize Layer 2 intercommunication and Layer 3 isolation, making networking more flexible.

• A.FALSE
• B.TRUE

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Which of the following is the least likely cause of the dual-active failure of the VRRP backup group?

• A.The low-priority VRRP backup group discards the received VRRP advertisement packets as illegal packets
• B.The VRRP backup group IDs on both ends are different
• C.The link that transmits VRRP advertisement packets is faulty
• D.The Master device sends 1 notification message per second

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