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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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1.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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2.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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3.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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4.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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5.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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6.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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7.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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8.多項選擇題A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? （）

A.ARP
B.CDP
C.DHCP
D.DNS
E.ICMP

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9.多項選擇題What are two results of entering the Switch(config)# vtp mode client command on a Catalyst switch?（）

A.The switch will ignore VTP summary advertisements.
B.The switch will forward VTP summary advertisements.
C.The switch will process VTP summary advertisements.
D.The switch will originate VTP summary advertisements.
E.The switch will create, modify and delete VLANs for the entire VTP domain.

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10.單項選擇題A technician is troubleshooting a host connectivity problem. The host is unable to ping a server connected to Switch_A. Based on the results of the testing, what could be the problem（）。

A.A remote physical layer problem exists.
B.The host NIC is not functioning.
C.TCP/IP has not been correctly installed on the host.
D.A local physical layer problem exists.

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