Some applications, such as Oracle database application, there is no data transfer for a long time, so that firewall session connection is interrupted, thus resulting in service interruption, which of the following technology can solve this problem?

• A.Configure a long business connection
• B.Configure default session aging time
• C.Optimization of packet filtering rules
• D.Turn fragment cache

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Antivirus software and host firewall have the same effect

• A.True
• B.False

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Firewall update signature database and Virus database online throjgh security servicecenter, requires the firewall can connect to the Internet first, and then need to configure the correct DNS addresses.

• A.FALSE
• B.TRUE

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Which of the following descriptions of the firewall fragment cache function are correct? (Multiple choice)

• A.By default, the firewall caches fragmented packets.
• B.For fragmented packets, NAT ALG does not support the processing of SIP fragmen:ed packets.
• C.By default, the number of largefragment caches of an IPV4 packet is 32, and the number of large fragmentation buffers of an IPV6 packet is 255
• D.After the fragmented packet is directly forwarded, the firewall forwards the fragment according to the interzone security policy if it is not the fragmented packet of the first packet.

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As shown in the figure, a TCP connection is established between client A and server B Which of the following two "Tpacket numbers should be?

• A.a+1: a
• B.b+1: b
• C.a+1: a+1
• D.a: a+1

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