In the ISIS broadcast network database synchronization process, the following statement which is correct?

• A.R1 and R3 maintain database consistency by periodically sending PSNP requests.
• B.R2 acts as DIS and periodically sends CSNP.
• C.R2 acts as DIS, and the Hello time is three times than the ordinary router.
• D.R2 acts as DIS will not receive PSNP requests for other routes.

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SSH uses asymmetric encryption algorithms AES and DES to realize the security of data transmission, and uses HMAC to ensure the integrity of the data.

• A.TRUE
• B.FALSE

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

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

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Which of the following statements about the description of the firewall security zone is correct?

• A.The same interface of the firewall can belong to different security zones
• B.The built-in security zone of the firewall can be deleted
• C.Different interfaces of the firewall can belong to the same security zone
• D.Different security zones of the firewall can have the same priority

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The following statement about the security confederation SA in IPsec, which is wrong?

• A.The SA is uniquely identified by a triplet that includes the Security Parameter Index (SP), the source IP address and the security protocol number used (AH or ESP).
• B.IPsec only supports the use of symmetric encryption algorithms to encrypt data.
• C.There must be two-way SA between IPsec peers to establish an IPsec VPN connection.
• D.Use display IPsec to view information about encryption algorithms, traffic, and other information used between another IPsec peer.

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