單項選擇題Acknowldgement, Sequencing, and Flow control are characteristics of which OSI layer?（）

A.Layer 2
B.Layer 3
C.Layer 4
D.Layer 5
E.Layer 6
F.Layer 7


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1.單項選擇題The administrator is unable to establish connectivity between two Cisco routers. Upon reviewing the command output of both routers, what is the most likely caust of the problem?（）

A.Authentication needs to be changed to PAP for both routers.
B.Serial IP addresses of routers are not on the same subnet.
C.Username/password is incorrectly configured.
D.Router names are incorrectly configured.

2.多項選擇題

Exhibit: Which of the following are true regarding the command output shown in the display (Choose two.)（）。

A.There are at least two routers participating in the RIP process.
B.A ping to 192.168.168.2 will be successful.
C.A ping to 10.0.15.2 will be successful.
D.RtrA has three interfaces participating in the RIP process.

5.多項選擇題Which can be done to secure the virtual terminal interfaces on a router？（）

A.Administratively shut down the interfaces.
B.Physically secure the interfaces.
C.Configure a virtual terminal password and login process.
D.Enter an access list and apply it to the terminal interfaces using the access-class command.
E.Create an access list and apply it to the terminal interfaces using the access-groupc ommand.

6.多項選擇題At which layers of the OSI model do WANs operate (Choose two.)（）。

A.application layer
B.session layer
C.transport layer
D.network layer
E.datalink layer
F.physical layer

7.單項選擇題Which statement is correct regarding the operation of DHCP?（）

A.A DHCP client uses a ping to detect address conflicts.
B.A DHCP server uses a gratuitous ARP to detect DHCP clients.
C.A DHCP client uses a gratuitous ARP to detect a DHCP server.
D.If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
E.If an address conflict is detected, the address removed from the pool for an amount of time configurable by the administrator.
F.If an address conflict is detected, the address is removed from the pool and will not be reused until server is rebooted.

8.單項選擇題

根據(jù)下圖，哪個選項描述了DLCI 17？（）

A.DLCI 17描述了R2和R3之間的ISDN線路
B.DLCI 17描述了一條在R2上的PVC 不能用在R3和R1上
C.DLCI 17是R2使用的二層地址，用來描述一條到R3的PVC
D.DlDLCI 17描述了一條從R2 R3到服務提供商撥號網絡

9.多項選擇題Why does the data communication industry use the layered OSI reference model (Choose two.)（）。

A.It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
B.It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
C.It supports theevolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers.
D.It encourages industry standardization by defining what functions occur at each layer of the model.
E.It provides a means by which changes in functionality in one layer require changes in other layers.

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請參見圖示。一臺路由器（其路由表如圖所示）收到發(fā)往192.168.1.4的數(shù)據(jù)包。路由器將如何處理該數(shù)據(jù)包？（）

題型：單項選擇題

何時必須使用clock rate 命令配置路由器串行接口？（）

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請參見圖示。主機A 正在訪問多臺服務器。結合使用什么端口號和地址即可唯一識別特定服務器上運行的特定進程？（）

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OSI 模型的哪兩項功能在第2層實現(xiàn)？（）

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請參見圖示。網絡中的所有設備均使用默認配置。此拓撲中存在多少個廣播域？（）

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請參見圖示。主機X 和主機Y 與本地網絡的通信受到限制。此問題的原因是什么？（）

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在配置路由器時，網絡技術人員想要命名路由器。輸入hostname 命令后，技術人員會看到下列哪一項提示？（）

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