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Which two statements are true about broadband cable （HFC） systems？（）A、Cable modems only operate at Layer 1 of the OSI model.B、Cable modems operate at Layers 1 and 2 of the OSI model.C、Cable modems operate at Layers 1， 2， and 3 of the OSI model.D、A functio

题目

Which two statements are true about broadband cable （HFC） systems？（）

  • A、Cable modems only operate at Layer 1 of the OSI model.
  • B、Cable modems operate at Layers 1 and 2 of the OSI model.
  • C、Cable modems operate at Layers 1， 2， and 3 of the OSI model.
  • D、A function of the cable modem termination system （CMTS） is to convert the modulated signal from the cable modem into a digital signal.
  • E、A function of the cable modem termination system is to convert the digital data stream from the end user host into a modulated RF signal for transmission onto the cable system.
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相似问题和答案

第1题：

You are asked to change the cable on interface ge－0／2／1.Which statement is correct?()

A. The cable is found on slot 2, port 0, and FPC 1.

B. The cable is found on FPC 0, slot 1, and port 2.

C. The cable is found on port 1, slot 0, and FPC 2.

D. The cable is found on slot 2, port 1, and FPC 0.


参考答案：D

第2题：

In which of the following layers of the OSI model does the TCP protocol operate?()

A.Session

B.Network

C.Data link

D.Transport


参考答案：D

第3题：

As a CCNA candidate, you must know the various layers of the OSI model. At which layers of the OSI Model do Wide Area Networks operate in? (Choose two)

A. Physical Layer

B. Datalink Layer

C. Network Layer

D. Session Layer

E. Transport Layer

F. Presentation Layer

G. Application Layer


正确答案：AB
A,B 解析：Explanation:
A WAN is a data communications network that covers a relatively broad geographic area and that often uses transmission facilities provided by common carriers, such as telephone companies. WAN technologies generally function at the lower two layers of the OSI reference model: the physical layer and the data link layer as shown below.


Note: Occasionally WAN's would also be considered to operate at layer 3, but since this question asked for only 2 chopices layers 1 and 2 are better choices.

第4题：

In the OSI model, at which layers do WANs operate at?()

A.Applicationlayer

B.Presentationlayer

C.Sessionlayer

D.Transportlayer

E.Networklayer

F.Datalinklayer

G.Physicallayer


参考答案：F, G

第5题：

A crossover cable is MOST commonly associated with which of the following layers of the OSI model?()

A.Session

B.Application

C.Network

D.Physical


参考答案：D

第6题：

You are asked to change the cable on interface ge－2／1／3.Which statement is correct?()

A. The cable is found on FPC 1, slot 3, and port 2.

B. The cable is found on slot 1, port 2, and FPC 3.

C. The cable is found on port 3, FPC 2, and slot 1.

D. The cable is found on FPC 1, slot 2, and port 3.


参考答案：C

第7题：

At which of the following layers does the TCP protocol operate?()

A.Layer 1

B.Layer 4

C.Layer 6

D.Layer 7


参考答案：B

第8题：

● OSI is a theoretical model that shows how any two different systems can communicate with each other．Router, as a networking device, operate at the (71) layer of the OSI model．

(71)

A．transport

B．application

C．network

D．physical


正确答案：C
试题（71）分析
 OSI是Open System Interconnect的缩写，意为开放式系统互联。国际标准组织制定了OSI模型。这个模型把网络通信的工作分为7层，分别是物理层、数据链路层、网络层、传输层、会话层、表示层和应用层。
 Router路由器，是运行在OSI中网络层network上的网络通信设备，而不是传输层transport layer，应用层application layer，及物理层physical layer，因此选C
参考答案
（71）C

第9题：

At which of the following layers does the ICMP protocol operate?()

A.Layer 1

B.Layer 3

C.Layer 4

D.Layer 5


参考答案：B

第10题：

At which layers of the OSI model do WANs operate?()

A.application layer

B.session layer

C.transport layer

D.network layer

E.datalink layer

F.physical layer


参考答案：E, F

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