Regarding BGP route filtering, which of the following description is wrong?

• A.For a locally advertised route, configure a routing policy. The policy takes effect before the route is added to the BGP routing table.
• B.In the same node of Route-Policy, the relationship of multiple if-match clauses for different attributes is "OR".
• C.When receiving a route from a BGP peer, perform a routing policy to filter unwanted BGP routes. These routes are not added to the local BGP routing table.
• D.The filtering relationship between the nodes of the Route-Policy is "OR", that is, the Route-Policy can be passed with a node filter only.

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Use the ip as-path-filter as-path-filter-number {deny | permit} regular-expression command to configure the as-path filter.
In this command, multiple clauses can form an as-path-filter statement.
So what is the relationship between multiple statements?

• A.Relationship with
• B.The routes are matched in order. When a route matches a clause, it no longer matches downwards.
• C.The routes are matched in order and the route needs to match all the clauses.
• D.Relationship or

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Which of the following description is correct about the ISIS LSP fragmentation extension?

• A.ISIS fragmentation extension is achieved by adding virtual systems, which can be expanded to up to 1000 virtual systems.
• B.Enable the lSIS router to generate more LSP fragments to carry more ISIS information.
• C.The maximum number of fragments that an ISIS router can generate is 1024.
• D.The fragmentation extension of ISIS is equally valid for the Helio package.

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The LAND attack is performed by the attacker sending a source address and a destination address to the destination host as the destination host. 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.False
• B.True

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As shown in the figure, three switches SW1, SW2 and SW3, where SW1 is the root bridge, the link between SW1 and SW2 is congested, and SW2 cannot receive the configuration BPDU sent by the root bridge. What kind of spanning tree protection mechanism need to configure to prevent problems caused by link congestion?

• A.BPDU protection
• B.Root protection
• C.TC-BPDU protection
• D.Loop protection

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