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單項選擇題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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1.多項選擇題網(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，使得安全策略的實現(xiàn)更簡單、可擴(kuò)展、更健壯

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2.多項選擇題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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3.單項選擇題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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4.多項選擇題使用ACL可以過濾哪些流量（）

A.ICMP消息
B.Traceroute
C.DOS TCP SYN
D.DOS smurf

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5.單項選擇題How dose a DHCP server dynamically assign IP address to host？（）

A.Addresses are allocated after a negotiation between the server and the host to determine the length ofthe agreement.
B.Addresses are assigned for a fixed period of time.At the end of period，a newquest for an address mustbe made ，and another address is then assigned.
C.Addresses are leased to host.A host will usually keep the same address by periodicallycontacting theDHCP sever to renew the lease.
D.Addresses are permanently assigned so that the host uses the same address at all times.

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