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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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1.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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2.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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3.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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4.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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5.單項選擇題Two buildings on the San Jose campus of a small company must be connected to use Ethernet with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage potential differences between the two buildings. Which media type should be used for the connection（）。

A.UTP cable
B.STP cable
C.coaxial cable
D.fiber optic cable

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6.多項選擇題Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）

A.alternate
B.backup
C.designated
D.disabled
E.root

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7.單項選擇題Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）

A.L2TP
B.IPsec
C.PPTP
D.RSA

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8.多項選擇題Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? （）

A.HDLC
B.Ethernet
C.Token Ring
D.PPP
E.FDDI
F.Frame Relay

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9.單項選擇題 Refer to the exhibit.How many broadcast domains exist in the exhibited topology？（）

A.one
B.two
C.three
D.four
E.five
F.six

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10.單項選擇題 A routing protocol is required that supports:
1)routing update authentication
2)an addressing scheme that conserves IP addresses
3)multiple vendors
4)a network with over 50 routers Which routing protocol fulfills these requirements（）。

A.RIPv1
B.RIPv2
C.EIGRP
D.OSPF

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