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單項選擇題 Refer to the exhibit.The Lakside Company has the internetwork in the exhibit.The administrator would liketo reduce the size of routing table on the Central router.Which partial routing table entry in the Central routerepresents a route summary that represents the vlans in Phoenix but no additional subnets？（）

A.10.0.0.0/22 is subnetted，1 subnets D 10.4.0.0[90/20514560] via 10.2.0.2，6w0d，serial0/1
B.10.0.0.0/28 is subnetted，1 subnets D 10.2.0.0[90/20514560] via 10.2.0.2，6w0d，serial0/1
C.10.0.0.0/22 is subnetted，1 subnets D 10.0.0.0[90/20514560] via 10.2.0.2，6w0d，serial0/1
D.10.0.0.0/30 is subnetted，1 subnets D 10.2.2.0[90/20514560] via 10.2.0.2，6w0d，serial0/1
E.10.0.0.0/28 is subnetted，1 subnets D 10.4.4.0[90/20514560] via 10.2.0.2，6w0d，serial0/1
F.10.0.0.0/30 is subnetted，1 subnets D 10.4.4.4[90/20514560] via 10.2.0.2，6w0d，serial0/1

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1.多項選擇題A single 802.11g access point has been configured and installed in the center of a square officE.A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem? （）

A.mismatched TKIP encryption
B.null SSID
C.cordless phones
D.mismatched SSID
E.metal file cabinets
F.antenna type or direction

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2.多項選擇題hat two things will a router do when running a distance vector routing protocol？（）

A.Send periodic updates regardless of topology changes.
B.Send entire routing table to all routers in the routing domain.
C.Use the shortest-path algorithm to the determine best path.
D.Update the routing table based on updates from their neighbors.
E.Maintain the topology of the entire network in its database.

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3.多項選擇題 The OSPF process has been started and the networks have been configured for Area 0 as shown in the diagram. The network administrator has several options for configuring RouterB to ensure that it will be preferred as the designated router (DR) for the 172.16.1.0 /24 LAN segment. What configuration tasks could be used to establish this preference (Choose three.)（）。

A.Configure the priority value of the Fa0/0 interface of RouterB to a higher value than any other interface on the Ethernet network.
B.Change the router id of Router B by assigning the IP address 172.16.1.130/24 to the Fa0/0 interface of RouterB.
C.Configure a loopback interface on RouterB with an IP address higher than any IP address on the other routers.
D.Change the priority value of the Fa0/0 interface of RouterB to zero.
E.Change the priority values of the Fa0/0 interfaces of RouterA and RouterC to zero.
F.No further configuration is necessary.

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4.多項選擇題What are two security appliances that can be installed in a network? （）

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

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5.多項選擇題Which of the following describes the roles of devices in a WAN?（）

A.A CSU/DSU terminates a digital local loop.
B.A modem terminates a digital local loop.
C.A CSU/DSU terminates an analog local loop.
D.A modem terminates an analog local loop.
E.A router is commonly considered a DTE device.
F.A router is commonly considered a DCE device.

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