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單項(xiàng)選擇題 When upgrading the IOS image，the network administrator receives the exhibited error message.What could be the cause of this error？（）

A.The new IOS image is too large for the router flash memory.
B.The TFTP server is unreachable from the router.
C.The new IOS image is not correct for this router platform.
D.The IOS image on the TFTP server is corrupt.
E.There is not enough disk space on the TFTP server for the IOS image.

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1.單項(xiàng)選擇題An administrator attempts a traceroute but receives a "Destination Unreadable" messagE.Which protocol is responsible for that message?（）

A.RARP
B.RUDP
C.ICMP
D.SNMP

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2.單項(xiàng)選擇題In which solution is a router ACL used？（）

A.protecting a server frome unauthorized acces
B.controlling path selection，based on the route metric
C.reducing router CPU utilization
D.filterring packets that are passing through a router

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3.單項(xiàng)選擇題 What is the most likely reason for the dispartly between the actual network numbers at the branches andthe routes in the routing table on Gateway-Router？（）

A.Branch-Router2 is configured to send both RIPv1 and RIPv2 updates.
B.Gateway-Router is configured to only receive RIPv2 updates.
C.Gateway-router is configured to receive only RIPv1 updates.
D.Branch-Router1 is configured to only send RIPv1 updates

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4.多項(xiàng)選擇題下列哪些是Radius的關(guān)鍵因素（）

A.使用RADIUS代理服務(wù)器提供可擴(kuò)展性
B.只加密密碼
C.將RADIUS認(rèn)證和授權(quán)結(jié)合成一個(gè)過(guò)程
D.支持遠(yuǎn)程訪問(wèn)技術(shù)、802.1X和SIP

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5.單項(xiàng)選擇題When a host transmits data across a network to another host, which process does the data go through?（）

A.standardization
B.conversion
C.encapsulation
D.synchronization

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