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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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1.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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2.多項選擇題Which two Ethernet fiber-optic modes support distances of greater than 550 meters？（）

A.1000BASE-CX
B.100BASE-FX
C.1000BASE-LX
D.1000BASE-SX
E.1000BASE-ZX

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3.多項選擇題A Catalyst 2950 needs to be reconfigureD.What steps will ensure that the old configuration is erased?（）

A.Erase flash.
B.Restart the switch.
C.Delete the VLAN database.
D.Erase the running configuration.
E.Erase the startup configuration.
F.Modify the configuration register.

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4.多項選擇題Which three statements accurately describe layer 2 Ethernet switches？（）

A.Microsegmentation decreases the number of collisions on the network.
B.if a switch receives a frame for an unkown destination，it uses ARP to resolve the address.
C.Spanning Tree Protocol allows switches to automatically share vlan information.
D.In a properly functioning network with redundant switched paths，each swiched aegment will contain oneroot bridge with all its ports in the forwarding state.All other switches in that broadcast domain will haveonly one root port.
E.Establishing vlans increases the number of broadcast domains.
F.Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3address information.

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5.多項選擇題What are two characteristics of RIPv2？（）

A.classful routing protocol
B.variable-length subnet masks
C.broadcast addressing
D.manual route summarization
E.uses SPF algorithm to compute path

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