單項選擇題In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN（）。

A.during high traffic periods
B.after broken links are re-established
C.when upper-layer protocols require high reliability
D.in an improperly implemented redundant topology
E.when a dual ring topology is in use


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1.單項選擇題There are no boot system commands in a router configuration in NVRAM. What is the fallback sequence that the router will use to find an IOS during reload（）。

A.TFTP server, Flash, NVRAM
B.ROM, NVRAM, TFTP server
C.NVRAM, TFTP server, ROM
D.Flash, TFTP server, ROM
E.Flash, NVRAM, ROM

2.單項選擇題Which type of EIGRP route entry describes a feasible successor?（）

A.a primary route,stored in the routing table
B.a backup route,stored in the routing table
C.a backup route,stored in the topology table
D.a primary route,stored in the topology table

3.多項選擇題以下哪兩個安全工具能被安裝在一個網絡里？（）

A.ATM
B.IDS
C.IOS
D.IOX
E.IPS
F.SDM

4.多項選擇題What are some of the advantages of using a router to segment the network (Choose two.)（）。

A.Filtering can occur based on Layer 3 information.
B.Broadcasts are eliminated.
C.Routers generally cost less than switches.
D.Broadcasts are not forwarded across the router.
E.Adding a router to the network decreases latency.

5.單項選擇題Which dose the frame-relay interface-dlci command configure？（）

A.remote DLCI on the main interface
B.local DLCI on the main interface
C.local DLCI on the subinterface
D.remote DLCI on the subinterface

6.多項選擇題

根據下圖，該access list被配置在路由器RTB的S0/0接口上的OUT方向，哪兩個數據包會被DENY，如果被路由到該接口上的話？（）

A.source ip address：192.168.15.5 destination port：21
B.source ip address：192.168.15.37 destination port：21
C.ssource ip address192.168.15.41 destination port：21
D.source ip address：192.168.15.36 destination port：23
E.source ip address：192.168.15.46 destination port：23
F.source ip address：192.168.15.49 destination port：23

7.單項選擇題An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC. If a reply is received, what does this confirm（）。

A.The PC has connectivity with a local host.
B.The PC has connectivity with a Layer 3 device.
C.The PC has a default gateway correctly configured.
D.The PC has connectivity up to Layer 5 of the OSI model.
E.The PC has the TCP/IP protocol stack correctly installed.

8.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.

9.多項選擇題哪兩種方法被推薦用來保守網絡設備的配置文件不受外網的威脅？（）

A.允許unrestricted訪問到console或VTY口
B.用防火墻去限制外網的網絡設備訪問
C.因為數據被自動加密，所以總是允許使用TELNET命令訪問網絡設備的命令行
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）

10.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

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