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In SDH， what is the name of the embedded Data Communication 

题目
单选题
In SDH， what is the name of the embedded Data Communication Channel （DCC） in bytes D1-D3？（）
A

 the DCC-E

B

 the DCC-M

C

 the DCC-R

D

 the Line DCC

E

 the Section DCC

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相似问题和答案

第1题：

I want to know().

A. what is his name

B. what his name is

C. what his name is


参考答案：C

第2题：

下面哪些句子可以表示"您贵姓?"()

A、What's your last name?

B、What's your family name?

C、What's your name?

D、What's your first name?


参考答案：AB

第3题：

When ________, John did not reply.

(A) he asking what his name was

(B) was asked what his name was

(C) asking what John’s name was

(D) asked what his name was


正确答案：D
解答参考：D.分词的独立结构。我们可以用诸如when，after等连接词+分词在句中做状语，但该状语的逻辑主语需与该句的主句主语一致。在本句中，主句的主语是John，所以状语的逻辑主语也应是John，他应该是被问及姓名，故用被动语态asked。【译文】当被问及姓名时，约翰没有回答。

第4题：

The data（ ）includes the function of updating data on a database， and retrieving data from a database.


A. management
B. storage
C. analysis
D. communication


答案：A
解析：
数据管理包括更新数据库中的数据，从数据库中检索数据等功能。

第5题：

Catalyst switches utilize a special technology to identify and prevent topology loops and ensure that data flows properly through a single network path. What is the name of this technology?()

A. VTP

B. ISL

C. 802.1Q

D. STP

E. None of the above


参考答案：D

第6题：

A Windows Communication Foundation (WCF) service implements the following contract. [ServiceContract] public interface IHelloService { [OperationContract(WebGet(UriTemplate="hello?name={name}"))]

A.

B.

C.

D.


参考答案：B

第7题：

In data communication, data link is those parts of two data terminal equipments that are controlled by a protocol along with the(71) data circuit, which together enable data(72). So-called protocol means, in short, a set of rules that determines the behavior. of functional units in achieving communication.Data circuit, however, consists of a pair of(73) transmission channels that provides a means of two-way data transmission. Between data switching exchanges, the data circuit may or may not include data circuit-terminating equipment (DCE), depending on the type of(74) used at the data switching exchange. Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment(75) to a DCE at the data switching exchange or dam concentrator location.

A．handshaking

B．interconnecting

C．linkage

D．joining


正确答案：B

第8题：

● The data （74） includes the function of updating data on a database, and retrieving ata from a database.

（74）

A. management

B. storage

C. analysis

D. communication


正确答案：A

第9题：

The data（ ）includes the function of updating data on a database，and retrieving data from a database.

A.management
B.storage
C.analysis
D.communication

答案：A
解析：
数据管理包括更新数据库中的数据，从数据库中检索数据等功能。

第10题：

What is a static packet-filtering firewall used for ？（）

  • A、It validates the fact that a packet is either a connection request or a data packet belonging to a connection
  • B、It evaluates network packets for valid data at the application layer before allowing connections
  • C、It analyzes network traffic at the network and transport protocol layers
  • D、It keeps track of the actual communication process through the use of a state table

正确答案:C

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