單項選擇題While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist（）。

A.the session layer
B.the protocol layer
C.the data link layer
D.the access layer
E.the network layer
F.the application layer


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1.多項選擇題Which statements describe the routing protocol OSPF? （）

A.It supports VLSM.
B.It is used to route between autonomous systems.
C.It confines network instability to one area of the network.
D.It increases routing overhead on the network.
E.It allows extensive control of routing updates.
F.It is simpler to configure than RIP v2.

2.多項選擇題Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true (Choose two.)（）。

A.Router C will use ICMP to inform Host 1 that Host 2 cannot be reached
B.Router C will use ICMP to inform Router B that Host 2 cannot be reached
C.Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached
D.Router C will send a Destination Unreachable message type
E.Router C will send a Router Selection message type
F.Router C will send a Source Quench message type

3.單項選擇題Which IPV6 routing protocol uses multicast group FF02::8 to send updates?（）

A.RIPng
B.OSPFv3
C.IS-IS for IPv6
D.static

4.多項選擇題What information does a router running a link-state protocol use to build and maintain its topological database?（）

A.hello packets
B.SAP messages sent by other routers
C.LSAs from other routers
D.beacons received on point-to-point links
E.routing tables received from other link-state routers
F.TTL packets from designated routers

5.多項選擇題OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? （）

A.Each OSPF area requires a loopback interface to be configured.
B.Areas may be assigned any number from 0 to 65535.
C.Area 0 is called the backbone area.
D.Hierarchical OSPF networks do not require multiple areas.
E.Multiple OSPF areas must connect to area 0.
F.Single area OSPF networks must be configured in area 1.

6.多項選擇題Which are valid modes for a switch port used as a VLAN trunk? （）

A.transparent
B.auto
C.on
D.desirable
E.blocking
F.forwarding

8.多項選擇題Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。

A.amount of RAM
B.bridge priority
C.IOS version
D.IP address
E.MAC address
F.speed of the links

9.單項選擇題Which component of VPN technology ensures that data can be read only by its intended recipient?（）

A.dataintegrity
B.encryption
C.keyexchange
D.authentication

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