衡量网络性能的主要标准是（）、（）。

填空题衡量网络性能的主要标准是（）、（）。

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1.多项选择题一个子网掩码为255.255.240.0的网络中，（）为合法网段地址。

A.150.150.0.0
B.150.150.0.8
C.150.150.8.0
D.150.150.16.0

2.多项选择题All of the routers in the network are configured with the ip subnet-zero command. Which network addresses should be used for Link A and Network A (Choose two.)（）。

A.Network A - 172.16.3.48/26
B.Network A - 172.16.3.128/25
C.Network A - 172.16.3.192/26
D.Link A - 172.16.3.0/30
E.Link A - 172.16.3.40/30
F.Link A - 172.16.3.112/30

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3.多项选择题 The switches shown in the diagram, Core and Core2, are both Catalyst 2950s. The addressing scheme for each company site is as follows:Router Ethernet port - 1st usable addressCore - 2nd usable addressCore2 - 3rd usable addressFor this network, which of the following commands must be configured on Core2 to allow it to be managed remotely from any subnet on the network? （）

A.Core2(config)# interface f0/0 Core2(config-if)# ip address 192.168.1.10 255.255.255.248
B.Core2(config)# interface vlan 1 Core2(config-if)# ip address 192.168.1.11 255.255.255.248
C.Core2(config)# line con 0 Core2(config-line)# password cisco
D.Core2(config)# line vty 0 4 Core2(config-line)# password cisco
E.Core2(config)# ip default-gateway 192.168.1.9
F.Core2(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.8

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4.单项选择题Which type of EIGRP route entry describes a fesible successor？（）

A.a primary route，stored in the routing table
B.a backup route，stored in the routingt able
C.a backup route，stored in the topology table
D.A primary route，stored in the topology table

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5.单项选择题无类路由协议路由表表目为三维组，其中不包括（）。

A.子网掩码
B.源网络地址
C.目的网络地址
D.下一跳地址

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6.单项选择题VLAN tag在OSI参考模型的哪一层？（）

A.应用层
B.表示层
C.会话层
D.传输层
E.网络层
F.链路层
G.物理层

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7.判断题RIP协议引入路由保持机制的作用是防止路由形成环路。

参考答案：对

8.单项选择题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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9.多项选择题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.

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10.多项选择题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

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