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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.Router R2 will not form a neighbor relationship with R1.
B.Router R2 will obtain a full routing table, including a default route, from R1.
C.R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.
D.R2 will not have a route for the directly connected serial network, but all other directly connected

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1.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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2.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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3.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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4.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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5.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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