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單項選擇題The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch.What must be done to ensure that this new switch becomes the root bridge on the network?（）

A.One router is running RIPv1.
B.RIP neighbor is 224.0.0.9.
C.The network contains a loop.
D.Network 10.10.1.0 is reachable.

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1.單項選擇題Which IPsec security protocol should be used when confidentiality is required？（）

A.AH
B.MB5
C.PSK
D.ESP

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2.多項選擇題Which two subnetworks would be included in the summarized address of 172.31.80.0 /20? （）

A.172.31.17.4 /30
B.172.31.51.16 /30
C.172.31.64.0 /18
D.172.31.80.0 /22
E.172.31.92.0 /22
F.172.31.192.0 /18

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3.單項選擇題Which command can you use to manually assign a static IPV6 address to a router interface？（）

A.ipv6 address PREFIX_1：：1/64
B.ipv6 autoconfig 2001：db8：2222：7272：：72/64
C.ipv6 autoconfig
D.ipv6 address 2001：db8：2222：7272：：72/64

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4.多項選擇題For what two purposes does the Ethernet protocol use physical addresses? （）

A.Network A - 172.16.3.48/26
B.Network A - 172.16.3.128/25
C.Network A - 172.16.3.192/26
D.Link A - 172.16.3.0/30
E.Link A - 172.16.3.40/30
F.Link A - 172.16.3.112/30

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5.多項選擇題 What can be determined from the line of show ip route output shown in the exhibit?（）

A.The next routing update can be expected in 35 seconds.
B.The IP address 10.10.10.6 is configured on S0/1.
C.The IP address 10.10.10.8 is configured on S0/1.
D.This route is using the default administrative distance.
E.The 10.10.10.8 network is two hops away from this router.

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