A session is an entry used to record the connection status of a protocol and is fundamental for the firewall to forward packets. Which of the following protocol packets will the firewall create sessions for?

• A.Subsequent fragment
• B.ICMP error packet
• C.GRE
• D.TCP

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BFD provides fast fault detection independent of media and routing protocols. To use this mechanism to detect link connectivity, devices at both ends must support this feature.

• A.TRUE
• B.FALSE

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Which of the following descriptions about OSPF Router ID is correct?

• A.When using the IP address of a physical interface as the Router ID of OSPF, the interface must be included in the corresponding OSPF domain.
• B.When the OSPF Router ID is not manually configured, the device first uses the IP address of the Loopback 0 interface as the Router ID.
• C.If the physical interface IP address is used as the OSPF Router ID, the one with the highest IP address will be selected as the OSPF Router ID of the device.
• D.Allow multiple devices to use the same Router ID, which also makes it easier to identify the area where the device is located.

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By default, a router interface sends PIM Hello messages at an interval of __________ seconds.

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SSH negotiates a variety of algorithms during its implementation. So which of the following are included in the algorithm categories used by SSH? (Multiple choice)

• A.Spanning tree algorithm to prevent communication loops
• B.Shortest Path Algorithm for Determining the Shortest Communication Path
• C.Algorithm used for data encryption
• D.Host public key algorithm for digital signatures and authentication
• E.Algorithms for data integrity protection
• F.Key exchange algorithm used to generate session keys

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