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單項選擇題Refer to the exibit. Three cisco 2950 switches are set to their default priority sttings.During the spanningtree process,which switch will be elected as the root bridge?（）

A.Switch3
B.Switch4
C.Switch2
D.Switch1

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1.單項選擇題Given an IP address 172.16.28.252 with a subnet mask of 255.255.240.0, what is the correct network addres?（）

A.172.16.16.0
B.172.16.24.0
C.172.16.0.0
D.172.16.28.0

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2.單項選擇題Which command can be used to verify the DLCI destination address in a Frame Relay static configuration?（）

A.show frame-relay end-to-end
B.show frame-relay map
C.show frame-relay lmi
D.show frame-relay pvc

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3.多項選擇題As a frame leaves a Layer 3 device，the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen？（）

A.The data is moving from 10BASE-TX to 100BASE-TX.
B.The WAN encapsulation type has changed.
C.The data format has changed from analog to digital.
D.The source and destination hosts are in the same subnet.
E.The source and destination MAC addresses have changed.

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4.單項選擇題Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）

A.Frame Relay
B.HDLC
C.x.25
D.PPP

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5.單項選擇題What is the default administrative distance of OSPF？（）

A.120
B.100
C.90
D.110

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6.單項選擇題A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782.The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table？（）

A. the OSPF route
B. the EIGRP route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes

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7.單項選擇題Which command sets and automatically encrypts the privileged enable mode password?（）

A.enbale password c1sco
B.secret enable c1sco
C.password enable c1sco
D.enable secret c1sco

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8.單項選擇題Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaionaddress？（）

A.FF02：：A
B.FF05：：101
C.FF02：：9
D.FF02：：6

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9.單項選擇題Which statement is true?（）

A.An IPv6 address is 64 b long and is represented as hexadecimal characters.
B.An IPv6 address is 32 b long and is represented as decimal digits.
C.An IPv6 address is 128 b long and is represented as decimal digits.
D.An IPv6 address is 128 b long and is represented as hexadecimal characters.

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10.單項選擇題 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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