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多項(xiàng)選擇題下列哪些是防火墻的局限性（）

A.配置不當(dāng)，防火墻會(huì)引起嚴(yán)重問題
B.很多應(yīng)用不能安全通過防火墻
C.用戶可能會(huì)積極尋找繞過防火期接收被阻信息的方法，使網(wǎng)絡(luò)遭受潛在攻擊的危險(xiǎn)
D.未授權(quán)的流量可能經(jīng)隧道或隱藏在合法的流量中通過防火墻

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1.單項(xiàng)選擇題Which of the following protocols uses both TCP and UDP ports？（）

A.SMTP
B.Telnet
C.FTP
D.DNS

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2.單項(xiàng)選擇題VLAN 3 is not yet configured on your switch.What happens if you set the switchport access vlan 3 commmand interface configuration mode?（）

A.The command is accepted and the respective VLAN is added to vlan dat.
B.The command is rejected.
C.The command is accepted and you must configure the VLAN manually.
D.The port turns amber.

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3.多項(xiàng)選擇題網(wǎng)絡(luò)中使用防火墻有哪些好處（）

A.防止敏感用戶和應(yīng)用暴露于不受信任的用戶前
B.網(wǎng)絡(luò)性能提升
C.凈化協(xié)議流量，防止暴露協(xié)議漏洞
D.正確的配置防火墻后，使得安全策略的實(shí)現(xiàn)更簡(jiǎn)單、可擴(kuò)展、更健壯

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4.多項(xiàng)選擇題Which two statements are characteristics of a distance vector routing protocol？（）

A.RIP is an example of distance vector routing protocols.
B.Updates are periodic and include the entire routing table.
C.Routing updates are sent only after topology changes
D.The protocol can be useful in hub-and-spoke and hierarchical networks.
E.Convergence is usually faster than with link state protocols
F.Each router has its own view of the topology

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5.單項(xiàng)選擇題The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?（）

A.10.10.0.0/18 subnetted with mask 255.255.255.252
B.10.10.0.0/25 subnetted with mask 255.255.255.252
C.10.10.0.0/24 subnetted with mask 255.255.255.252
D.10.10.0.0/23 subnetted with mask 255.255.255.252
E.10.10.0.0/16 subnetted with mask 255.255.255.252

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