In information security protection, commonly used security products include firewalls, Anti-DDos equipment, and IPS/IDS equipment

• A.True
• B.False

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Regarding the NAT policy processing flow, which of the following options are correct? (Multiple choice)

• A.The source NAT policy query is processed after the session is created
• B.Server-map is processed before the security policy matches
• C.Server-map is processed after status detection
• D.The source NAT policy is processed after the security policy is matched

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About firewall fragmentationWhich of the following options is correct? (multiple choice)

• A.By default, the firewall caches fragmented packets
• B.For fragmented packets,NATALGnot supportedSIPFragmented Packet Processing
• C.After the direct forwarding of fragmented packets is configured, the firewall will forward the fragmented packets that are not the first fragmented packets according to the interzone security policy.
• D.By default, aIPV4The maximum number of fragment buffers for packets is32,OneIPV6The maximum number of fragment buffers for packets is255

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The attacker searches the ports currently open by the attacked object by scanning the ports to determine the attack mode. In port scanning attacks, attackers usually use Port Scan attack software to initiate a series of TCP/UDP connections, and determine whether the host uses these ports to provide services according to the response packets. Such network probing is called _____ scanning.[fill in the blank]*

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A digital envelope refers to the data obtained by the sender using the receiver's _____ to encrypt the symmetric key[fill in the blank]*

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