The LAND attack is performed by the attacker sending a source address and a destination address to the destination host, they are all the destination hosts. The source port and the destination port are the same SYN packet. 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.True
• B.False

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Which of the following are the techniques for improving MPLS BGP VPN reliability? (Multiple Choice)

• A.VPN GR
• B.Configure CE dual-homing networking at the access layer.
• C.Private network IP routing between the PE and the CE FRR
• D.VPN FRR

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In multicast network, what happens to multicast traffic that cannot be forwarded normally? (Multiple choice)

• A.Multi-router exit network, this router is not DR
• B.The router does not have RPF routes.
• C.PIM is not enabled on the RPF interface.
• D.The upstream router discards the received PIM Join message.

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Four routers R1, R2, R3, and R4 run ISIS, the ISIS router type is marked, and the routing table is viewed on R1. The reason why R1 does not reach the route of 10.34.34.4 is

• A.R2's system-ID conflicts with R3
• B.R2's system-ID conflicts with R1
• C.Regional planning errors for R3 and R4
• D.Configure a routing policy on R2 to filter the default route.

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Enable SSM on the entire IP multicast network.
Which of the following statements about SSM are correct? (Multiple Choice)

• A.SSM is suitable for one-to-many application
• B.Only SPT is used for SSM.
• C.Only RPT is used for SSM.
• D.No RP is required.
• E.SSM is recommended when there are multiple sources on the network and multicast routing is simple.

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