An advanced access control list is a sequence of rules consisting of permit |deny statements that can match IP messages based on which attributes? (). Multiple select).

• A. Source port number
• B. Destination address
• C. Source address
• D. Destination port number

MPLS does not enable the secondary unsubject pop-up, the penultimate hop label can be the same as

• A. FALSE
• B. TRUE

Without dividing the zone, is the following description of the link state routing protocol correct?

• A. Routers throughout the flood domain have the same database of wrong-state states
• B. The router will send all the mis-routing status information from one neighbor to all other neighbors to ensure the synchronization of the database
• C. Each router learns route entries directly from the route update and adds them to the routing table
• D. Routers in the flood domain may receive the same link state information repeatedly
• E. Each router establishes a topology for the entire floodplain

Off-stem cross-domain VPN-Option B scenario, the following description is incorrect?

• A. The outer layer tag is exchanged between two ASBRs to vpnV4 routes.
• B. two ASBRs IP-EBGP neighbor relationships.
• C. During the packet forwarding process, it is necessary to exchange the VPN's private network LSP on the
• D. The cross-domain VPN-Option B scheme is not limited by the number of interconnection links between ASBRs