在七十年代末，国际标准化组织ISO提出了开放系统互连参考模型。协议分层大大简...

单项选择题在七十年代末，国际标准化组织ISO提出了开放系统互连参考模型。协议分层大大简化了网络协议的复杂性，在OSI7层模型中，网络层的功能主要是（）。

A.在信道上传输原始的比特流
B.加强物理层数据传输原始比特流的功能并且进行流量调控
C.确定数据包从源端到目的端如何选择路由
D.确保到达对方的各段信息正确无误

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1.单项选择题PPP验证成功后，将由Authenticate阶段转入什么阶段？（）

A.Dead
B.Establish
C.Network
D.Terminate

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2.单项选择题OSI代表（）。

A.Organization for Standards Institute
B.Organization for Internet Standards
C.Open Standards Institute
D.Open Systems Interconnection

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3.单项选择题What is the purpose of the inverse ARP？（）

A.to map a known DLCI to an IP address
B.to mapa known IP address to a MAC address
C.to map known SPID toa MAC address
D.to map a known DLCI to a MAC address
E.to map a known IP address to a SPID
F.to mapa known MAC address to an IP address

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4.单项选择题X.25协议提供给用户的可用的逻辑信道最多为（）条。

A.16
B.32
C.4095
D.4096

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5.单项选择题The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?（）

A.10.10.0.0/18 subnetted with mask 255.255.255.252
B.10.10.0.0/25 subnetted with mask 255.255.255.252
C.10.10.0.0/24 subnetted with mask 255.255.255.252
D.10.10.0.0/23 subnetted with mask 255.255.255.252
E.10.10.0.0/16 subnetted with mask 255.255.255.252

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6.单项选择题X.25使用映射的作用是（）。

A.映射本地IP到对端端口值，以便路由器发送数据时确认发送端口
B.映射本地IP到本地端口值，以便路由器发送数据时确认发送端口
C.映射对端IP到本地端口值，以便X.25交换网络查找数据发送路径
D.映射对端IP到对端端口值，以便X.25交换网络查找数据发送路径

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7.填空题衡量网络性能的主要标准是（）、（）。

参考答案：带宽；延迟

8.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

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9.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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10.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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