Which of the following tools cannot be directly referenced by the If-match clause in the Route-policy?

• A.Community-filt
• B.IP-prefix
• C.AS-path-filter
• D.Regular expression

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As shown in the figure, the AS100 has two paths to the AS400. By default, the best route is transmitted from the AS200. It is known that the path to the AS400 through the AS300 is better. Therefore, the following configuration is performed on the R2. After the configuration is complete, the optimal route is not changed. Which of the following operations can make the configuration take effect?
[R2] ip as-path-filter 1 permit ^400$
R2] route-policy med permit node 10
r2-route-policy] if-match as-path-filter 1
Ir2-route-policy] apply cost 20

• A.Configure compare- different-as-med in the BGP process of R1.
• B.Configure deterministic-med in the BGP process of R1.
• C.Configure compare- different-as-med in the BGP process of R2.
• D.Configure deterministic-med in the BGP process of R2.

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Which of the following statements about the attributes of the ISIS protocol LSP message are correct? (Multiple choice)

• A.Configure an intelligent timer generated by the LSP, which can automatically adjust the delay time according to the change frequency of the routing information.
• B.When the link state information increases, the packet length of the SP can be increased, so that each LSP can carry more information.
• C.The LSP fast flooding feature first spreads out LSPs smaller than the specified number to speed up the synchronization process of the LSDB.
• D.Reduce the minimum interval for sending LSPs on an interface to speed up LSP diffusion.

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The following topology diagram, all the interfaces of the router in the figure open the ISIS protocol, which of the following statement is correct? (Multiple Choice)

• A.If the Ethernet 0/0/0 interface of R3 is down, then R2 will become the master device.
• B.If the GE0/0/0 interface of R3 is down, then R2 will become the master device.
• C.If the Ethernet 0/0/1 interface of R1 is down, then R2 will become the master device.
• D.If the Ethernet 0/0/0 interface of R1 is down, then R2 will become the master device.

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Which of the following description about the CHAP authentication function in the PPP protocol is correct? (Multiple Choice)

• A.If the authenticator does not configure a username, the password cannot be configured on the authenticated interface.
• B.The user name must be configured under the authenticated interface of CHAP authentication.
• C.Three-message interactive authentication is required, and the username is transmitted only on the network without transmitting the password.
• D.Calculate a Hash value by the MD5 algorithm using the authentication sequence ID, random number and key

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