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 of the agreement.
B.Addresses are assigned for a fixed period of time.At the end of period,a newquest for an address must be made,and another address is then assigned.
C.Addresses are leased to host.A host will usually keep the same address by periodically contacting the DHCP 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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1.多項選擇題哪兩種方法被推薦用來保守網(wǎng)絡設備的配置文件不受外網(wǎng)的威脅？（）

A.允許unrestricted訪問到console或VTY口
B.用防火墻去限制外網(wǎng)的網(wǎng)絡設備訪問
C.因為數(shù)據(jù)被自動加密，所以總是允許使用TELNET命令訪問網(wǎng)絡設備的命令行
D.使用SSH或其他加密、認證機制去訪問設備的配置
E.為了避免丟失密碼，所以不對密碼進行加密（明文）

2.單項選擇題What is the function of the Cisco IOS command ip nat inside source static 10.1.1.5 172.35.16.5（）。

A.It creates a global address pool for all outside NAT transactions
B.It establishes a dynamic address pool for an inside static address
C.It creates dynamic source translations for all inside local PAT transactions
D.It creates a one-to-one mapping between an inside local address and an inside global address
E.It maps one inside source address to a range of outside global addresses

3.單項選擇題Which command can be a router to verify the layer 3 path to a host？（）

A.traceroute address
B.tracert address
C.ssh address
D.telnet address