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單項(xiàng)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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2.多項(xiàng)選擇題使用ACL可以減少哪些攻擊（）

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B.IP地址欺騙
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3.單項(xiàng)選擇題Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch overFastEthernet？（）

A.802.3ad
B.802.1w
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4.多項(xiàng)選擇題相對(duì)標(biāo)準(zhǔn)和靜態(tài)擴(kuò)展ACL，動(dòng)態(tài)ACL有哪些優(yōu)勢(shì)（）

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5.單項(xiàng)選擇題Which component of VPN technology ensures that data can be read only by its intended recipient?（）

A.data integrity
B.encryption
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