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RG-6 coaxial cable&#

题目

RG-6 coaxial cable is typically used in all of the following applications：（）

  • A、multi-room audio， telephone， intercom and temperature control.
  • B、thermostat， CCTV， smoke detectors and keypads.
  • C、home theater， lighting control and multi-room audio.
  • D、video， digital cable， and satellite applications.
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相似问题和答案

第1题：

In a data communication system, which transport media can be described as following: Has two classes: single mode and multiple mode; with higher transmit rate; with the best reliability

A．radio channel

B．fiber optic cable

C．twisted-pair cable

D．coaxial cable


正确答案：B

第2题：

isn't a type of transmission medium used for LANs.

A．Twisted pair

B．Coaxial cable

C．Satellite

D．Optical fiber


正确答案：C
解析：四个选项分别是双绞线、同轴电缆、人造卫星和光纤，只有C不属于局域网传输介质。

第3题：

根据下面的文字资料回答 72～76 题 （ 1 ）is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string．

（ 2 ）is a protocol that most USENET machines nOW use it to allow news articles to propagate from one machine to another over a reliable connection．

（ 3 ）is an approach preferred by cable TV providers．In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable．

（ 4 ）is a device used to connect two separate network that use different communication protocol．

（ 5 ）is a digital-to-digital polar encoding method in which the signal level is always either positive or negative．

第6题：文中（ 1 ）处正确的答案是（ ）。

A．MD

B．RSA

C．DES

D．MIB


正确答案：A

MD是一种单向的在利用任意长度的文本来计算固定长度的字符串的功髓；NNTP是一种非常流行的新闻机制协议，现在我们利用它通过可靠的连接传播新的文章；HFC是一种更受有线电视提供商欢迎的接入方法，利用这种方法，光纤中止于广电转换器，最后一段通过共享式同辅电缆传输；网桥是一种用来涟接两个采用了不同通信协议的网络的设备；非零编程(NRZ)是一种数字编码技术，在它的编码中要么正电平要么负电平。

第4题：

is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(67)is a protocol that most USENET machines how use it to allow news articles to propagate from one machine to another over a reliable connection.(68)is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(69)is a device used to connect two separate network that use different communication protocol.(70)js a digital

A．MD

B．RSA

C．DES

D．MIB


正确答案：A
解析：本题主要考查加密理论中的消息摘要(messagedigest)的简写MD。答案为A。

第5题：

RG－59 is a designation for which of the following cable types?()

A. Plenum

B. Fiber optic

C. Twisted pair

D. Coaxial


参考答案：D

第6题：

HFC(Hybrid Fiber Coaxial,指光纤同轴电缆混合网),它是一种新型的宽带网络,采用光纤到服务区,而在进入用户的最后一段采用同轴电缆,最常见的就是( )。"

A.有线电视网络

B.电话网

C.小区宽带

D.数字数据网


参考答案A

第7题：

Older video cards used S－video to output to a TV. This standard has been replaced by:()

A. FireWire.

B. SCSI.

C. coaxial.

D. HDMI.


参考答案：D

第8题：

● (71) In the strength of the carrier signal is varied to represent binary 1 or 0．

(72) is a system that can map a name to an address and conversely an address to an name．

(73) is a three-way handshaking authentication protocol that it's packets are encapsulated in the point-to-point protocol

(74) is an approach that enables an ATM Switch to behave like a LAN switch．

(75) is an guided media which is made of glass or plastic and transmits signals in the form. of light．

(71) A．ASK

B．PSK

C．FSK

D．FDM

(72) A．NAT

B．NCP

C．DDN

D．DNS

(73) A．PPP

B．PAP

C．CHAP

D．LCP

(74) A．VLAN

B．LANE

C．VPN

D．IPOA

(75) A．Coaxial cable

B．Optical fiber

C．Unshielded Twisted-pair Cable

D．Shielded Twisted-pair Cable


正确答案：A,D,C,B,B
【解析】在幅频键控(ASK)调制中，载波的振幅随所表示的0、1变化；DNS是一种能够将名字映射为IP地址同时也可以将IP地址映射为名字的系统；CHAP是一种利用三次握手机制的认证协议，它的数据包被封装在点对点链路协议上：LANE是一种能够让ATM交换机象局域网交换机一样的方式；光纤是一种用玻璃纤维和塑料外套制成的传输介质，它上面以光的形式来传输信号。

第9题：

Which of the following describes what the number two represents in l00Base2 cabling?()

A. Fiber

B. Coaxial cable

C. UTP

D. Twisted pair


参考答案：B

第10题：

is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.

(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.

(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.

(74) is a device used to connect two separate network that use different communication protocol.

(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．MD

B．RSA

C．DES

D．MIB


正确答案：A

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