During the establishment of the TCP connection as shown in the figure, the X part of the SYN should be filled with ________.

• A.a+1
• B.b+1
• C.a
• D.b

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In the following statement about Easy IP, the error is ______.

• A.No need to configure NAT address pool when configuring Easy IP
• B.Easy IP is suitable for NAT device dialing or dynamically obtaining public network IP address
• C.When configuring Easy IP, there is no need to configure ACL to match the packets that need to be translated by NAT
• D.Easy IP is a special case of NAPT

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The WAN link between the only two routers MSR-1 and MSR-2 in the customer network adopts the PPP protocol, and the two ends learn each other's routes by configuring RIP. Currently, the route learning is normal, and now it is in the RIP of MSR-1. The following commands are added to the configuration:
[MSR-1-rip-1] silent-interface all
So ______ . (Multiple choice)

• A.This command makes all interfaces of MSR-1 only send routing updates and not accept routing updates
• B.10 minutes after configuring this command, the RIP route in the MSR-1 routing table disappears
• C.This command makes all interfaces of MSR-1 only receive routing updates without sending routing updates
• D.10 minutes after configuring this command, the RIP route in the MSR-2 routing table disappears

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The well-known port number of the transport layer protocol used by DNS is ______.

• A.55
• B.50
• C.51
• D.53

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The subnet mask of IP address 132.119.100.200 is 255.255.255.240, so the broadcast address of its subnet is ______.

• A.132.119.100.223
• B.132.119.100.193
• C.132.119.100.255
• D.132.119.100.207

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