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單項(xiàng)選擇題在七十年代末，國(guó)際標(biāo)準(zhǔn)化組織ISO提出了開(kāi)放系統(tǒng)互連參考模型。協(xié)議分層大大簡(jiǎn)化了網(wǎng)絡(luò)協(xié)議的復(fù)雜性，在OSI7層模型中，網(wǎng)絡(luò)層的功能主要是（）。

A.在信道上傳輸原始的比特流
B.加強(qiáng)物理層數(shù)據(jù)傳輸原始比特流的功能并且進(jìn)行流量調(diào)控
C.確定數(shù)據(jù)包從源端到目的端如何選擇路由
D.確保到達(dá)對(duì)方的各段信息正確無(wú)誤

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1.單項(xiàng)選擇題PPP驗(yàn)證成功后，將由Authenticate階段轉(zhuǎn)入什么階段？（）

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

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2.單項(xiàng)選擇題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.單項(xiàng)選擇題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.單項(xiàng)選擇題X.25協(xié)議提供給用戶的可用的邏輯信道最多為（）條。

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

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5.單項(xiàng)選擇題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.單項(xiàng)選擇題X.25使用映射的作用是（）。

A.映射本地IP到對(duì)端端口值，以便路由器發(fā)送數(shù)據(jù)時(shí)確認(rèn)發(fā)送端口
B.映射本地IP到本地端口值，以便路由器發(fā)送數(shù)據(jù)時(shí)確認(rèn)發(fā)送端口
C.映射對(duì)端IP到本地端口值，以便X.25交換網(wǎng)絡(luò)查找數(shù)據(jù)發(fā)送路徑
D.映射對(duì)端IP到對(duì)端端口值，以便X.25交換網(wǎng)絡(luò)查找數(shù)據(jù)發(fā)送路徑

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7.填空題衡量網(wǎng)絡(luò)性能的主要標(biāo)準(zhǔn)是（）、（）。

參考答案：帶寬；延遲

8.多項(xiàng)選擇題一個(gè)子網(wǎng)掩碼為255.255.240.0的網(wǎng)絡(luò)中，（）為合法網(wǎng)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.多項(xiàng)選擇題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.多項(xiàng)選擇題 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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