The configuration of two routers in a company is as follows. which of the following statement about the R1 routing table is correct?

• A.If the priority of the R1 ISIS protocol is adjusted to 5, the P route entry with the destination network segment of 10.0.2.2/32 on R1 is generated by ISIS.
• B.If the priority of the R2 ISIS protocol is adjusted to 5, the P route entry with the destination network segment of 10.1.2.2/32 on R1 is generated by ISIS.
• C.Only if the priority of the R2 ISIS protocol is adjusted to 5, the P route entry with the destination network segment of 10.1.2.2/32 on R1 will be generated by OSPF.
• D.If the priority of the ISIS protocol of R1 is adjusted to 5, the P route entry with the destination network segment of R1 on 10.6.2.2/32 is generated by OSPF.

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Which of the following statement about the NSSA area is correct?

• A.In the hello message sent by OSPF neighbor in NSSA region, position N is 0 and position E is 1 in option field.
• B.The NSSA region generates Type 7 LSA to inform external routing, and the FA address role in the Type 7 LSA is to prevent loops
• C.In the hello message sent by OSPF neighbor in NSSA region, position N is 1 and position E is 0 in option field
• D.The NSSA region will automatically generate a default LSA to access the external network.

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BGP can only automatically aggregate routes originating from Incomplete.

• A.True
• B.False

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Which of the following descriptions about the FTP protocol is correct?

• A.FTP always uses TCP port 20 to establish a data session, using ICP port 21 to establish control Session
• B.In the FTP Passive mode, the client completes the initialization of the TCP session for control and data.
• C.FTP always uses a TCP session to transmit control information and data information.
• D.In FTP Active mode, the server uses the command "PORT" to tell the client which port it expects to send data.
• E.FTP always uses TCP port 21 to establish a data session and TCP port 20 to establish a control session.

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The LAND attack is performed by the attacker sending a source address and a destination address to the destination host are the destination host, the same SYN packet on source port and the destination port. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

• A.False
• B.True

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