If the Length/Type of an Ethernet data frame is 0X8100, which of the following is correct?

• A.This data frame must carry VLAN TAG
• B.There must be a TCP header in the upper layer of this data frame
• C.There must be an IP header in the upper layer of this data frame
• D.There must be a UDP header in the upper layer of this data frame

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In the WLAN network architecture, what is terminal equipment that supports the 802.11 standard called?

• A.Client
• B.STA
• C.AC
• D.AP

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Which of the following descriptions about firewalls is wrong?

• A.Firewall can isolate networks with different security levels
• B.Firewall can realize access control between different networks
• C.The firewall cannot achieve network address translation
• D.Firewall can realize user identity authentication

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As shown in the figure, RTA uses NAT technology and realizes multiple-to-multiple NAPT address translation by defining an address pool, so that hosts in the private network can access the public network. Suppose that there are only two public IP addresses in the address pool, and they have been assigned to hosts A and B for address conversion, and if host C also wants to access the public network, which of the following description is correct?

• A.RTA converts the source port of host C, and host C can access the public network
• B.Host C cannot be assigned a public network address and cannot access the public network
• C.All hosts can access the public network by using the public network address in turn
• D.RTA assigns the interface address (200.10.10.3) to host C, host C can access the public network

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On the VRP platform, the default protocol priority of routes in the direct routing, static routing, RIP, OSPF area is:

• A.Direct routing,OSPF,RIP,Static routing
• B.Direct routing,RIP,Static routing,OSPF
• C.Direct routing,OSPF,Static routing,RIP
• D.Direct routing,Static routing,RIP,OSPF

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