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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

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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

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3.多項選擇題以下哪兩個安全工具能被安裝在一個網(wǎng)絡(luò)里？（）

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

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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.

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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

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