Which layer of data packets does the packet filtering firewall inspect?

• A.Link layer
• B.Application layer
• C.Network layer
• D.Physical layer

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Route redistribution refers to the operation of only advertising routing information from one routing protocol to another routing protocol.
Which of the following statements about route introduction is correct? (Multiple choice)

• A.When implementing route import, you need to pay attention to the routing priority agreements of different vendors may be different
• B.By importing routes, routing information can be transmitted between different routing protocols
• C.The routing protocol itself has anti-loop characteristics, so there is no need to consider loop issues when routes are imported into each other
• D.When implementing route import, route control can also be deployed to achieve flexible control of correct business traffic

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How does IGMPv2 router maintain the network segment group membership? (Multiple choice)

• A.After receiving the eave message, the router immediately deletes the group membership
• B.The router maintains a timeout timer for each group membership, refreshes the timer if it receives the receiver host, and deletes the group membership if the timer expires
• C.The router will query a specific group
• D.The router periodically sends Query messages, and the receiver host reports a Repeat message after receiving the Query message

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There can be multiple nodes under a route-policy. Different nodes are identified by node. Each node can have multiple if-match and apple clauses. Which of the following descriptions are wrong? (Multiple choice)

• A.The relationship between the if-match clauses under each node is "and"
• B.There is an "or" relationship between different nodes
• C.There is an "or" relationship between the if-match clauses under each node
• D.The relationship between different nodes is "and"

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Which is not included in the three elements of the server map table of the USG series firewalls?

• A.Source IP
• B.Destination port number
• C.Agreement number
• D.Destination IP

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