is an error detection code that most data communication networks use。A．CRCB．Manchester CodeC．Huffman CodeD．4B/5B Code
题目
is an error detection code that most data communication networks use。
A．CRC
B．Manchester Code
C．Huffman Code
D．4B/5B Code
相似考题
更多“is an error detection code that most data communication networks use。A.CRCB.Manchester ”相关问题
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第1题：
You need to serialize an object of type List<int> in a binary format.The object is named data.Which code segment should you use?()A.
B.
C.
D.
参考答案：A
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第2题：
The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72)control functions.In(73)data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74)by the primary station, interprets received commands and (75) responses to be transmitted.
A．performance
B．functional
C．capacity
D．quality
正确答案：B
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第3题：
For each blank, choose the best answer from the four choices and write down on the answer'sheet.
(66)is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group.
(67)is an error detection code that most data communication networks use.
(68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(69)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.
(70)is an identifier of a web page.
A．ICMP
B．SMTP
C．IGMP
D．ARP
正确答案：C
解析：IGMP协议是接收者发现协议。IGMP协议运行在主机和路由器之间，用于路由器维护组播组是否有组成员。IGMP只维护组播组是否有成员，而不维护组播组有哪些成员，因此状态信息不会因组播组成员的增加而增加。
循环冗余校验(cyclic redundancy check，CRC)是由分组线性码的分解而来，其主要应用是二元码组，主要应用于数据传输过程中的差错控制。
OSPF是一个内部网关协议(Interior Gateway Protocol，IGP)，用于在单一自治系统 (autonomous system，AS)内决策路由。与RIP相对，OSPF是链路状态路由协议，而RIP是距离向量路由协议。它是依靠距离，即跳数来衡量一条路径的好坏。通过距离向量路由算法来传播路由信息。
ATM是异步传输模式，实现OSI物理层和链路层功能。ATM以独有的ATM信元进行数据传输，每个ATM信元为53个字节。ATM不严格要求信元交替地从不同的源到来，每一列从各个源来的信元，没有特别的模式，信元可以从任意不同的源到来，而且不要求从一台计算机来的信元流是连续的，数据信元可以有间隔，这些间隔由特殊的空闲信元(idle cell)填充。
URL(Uniform. Resource Locator)是单一资源定位符，是一种用来鉴别文件与资源在WWW中地址的专用表示。 -
第4题：
is an error detection code that most data communication networks use。
A．Cyclic Redundancy Code
B．Manchester Code
C．Huffman Code
D．4B/5B Code
正确答案：A
解析：循环冗余码(CRC)是一种检错码，主要应用于数据传输过程中的差错控制。 -
第5题：
根据下面的文字资料回答 68～72 题For each blank．choose the best answerfrom the four choices and write down on the answer sheet．
（ 1 ）is a protocol that a host uses toinform. a router when it joins or leaves an Internet muhicast group．
（ 2 ） is an error detection code that most data communication networks use．
（ 3 ）is an interior gateway protocol that uses a distance vector algorithm topropagate routing information．
（ 4 ）is a transfer mode in which all types of information ate organized intofixed form. cells onan asynchronous or non－periodic basis over a range of media．
（ 5 ）is an identifier of a web page．
第68题：文中（ 1 ）处正确的答案是（ ）。
A．SMTP
B．ICMP
C．RARP
D．IGMP
正确答案：DIGMP协议是Intemet组管理协议。TCP／IP协议族的一个子协议，允许Intemet主机参加多播，也即是IP主机用作向相邻多目路由器报告多目组成员的协议。多目路由器是支持组播的路由器，向本地网络发送IGMP查询。主机通过发送IGMP报告来应答查询。组播路由器负责将组播包转发到所有网络中组播成员。
循环冗余校验(CRC)是一种用得最广，检错能力很强的差错检测方法。它对数据进行多项式计算，并将得到的和数附在帧的后面。接收设备也执行类似的算法。
RIP是推出时间最长的路由协议，也是最简单的路由协议。它是“路由信息协议”的缩写，主要传递路由信息(路由表)来广播路由：每隔30秒，广播一次路由表，维护相邻路由器的关系，同时根据收到的路由表计算自己的路由表。RIP运行简单，适用于小型网络，Internet上还在部分使用着RIP。
OSPF协议是“开放式最短路优先”的缩写。“开放”是针对当时某些厂家的“私有”路由协议而言，而正是因为协议开放性，才造成OSPF今天强大的生命力和广泛的用途。它通过传递链路状态(连接信息)来得到网络信息，维护一张网络有向拓扑图，利用最小生成树算法
(SPF算法)得到路由表。OSPF是一种相对复杂的路由协议。ATM是Asynchronous Time division multiplexing的缩写，译为“异步传输模式”，它是以高速分组传送模式为主，综合电路传输模式优点的一种宽带传输模式。
URL是单一资源定位符，是一种用来鉴别文件和资源在WWW中地址的专用表示。 -
第6题：
Two autonomous networks who wish to exchange routing data should use which of the following protocols?（）
- A、OSPF
- B、BGP
- C、EIGRP
- D、IS-IS
正确答案:B -
第7题：
Error detection schemes check errors in the data packets by reading which field frame IDs?（）
- A、MTU
- B、PDU
- C、FCS
- D、Flag
- E、MAC
- F、BRI
正确答案:C -
第8题：
You have a large amount of historical data in a flat file. Some analysts in your organization need toquery this data in the file. The file is too large to load the data in it into your current database. Which is the most effective method to access this data in your database（）
- A、Use the database link.
- B、Use the SQL*Loader utility.
- C、Use the Oracle Data Pump utility.
- D、Create an external table and leave the data in the flat file
正确答案:D -
第9题：
You are developing a client that sends several types of SOAP messages to a Windows Communication Foundation (WCF) service method named PostData. PostData is currently defined as follows:[OperationContract]void PostData(Order data);You need to modify PostData so that it can receive any SOAP message. Which code segment should you use？（）
- A、[OperationContract(IsOneWay=true, Action="*", ReplyAction="*")] void PostData(Order data);
- B、[OperationContract(IsOneWay=true, Action="*", ReplyAction = "*")] void PostData(BodyWriter data);
- C、[OperationContract] void PostData(BodyWriter data);
- D、[OperationContract] void PostData(Message data);
正确答案:D -
第10题：
You need to meet the fraud detection requirements. What should you do?（）
- A、Use Percentage Sampling in SSIS.
- B、Use a Neural Network Data mining algorithm.
- C、Create an SSAS Key Performance Indicator for each account.
- D、Monitor transactions by using SQL Server Profiler.
正确答案:B -
第11题：
单选题Which of the following networks would MOST likely require EGP routing?（）ANetworks that use OSPF in addition to static routes
BNetworks with classless Internet domain routing
CNetworks with multiple ISPs
DNetworks that use encryption
正确答案： B解析： 暂无解析 -
第12题：
单选题Which technique retrieves the error number when explicit DML fails?（）ASQLCODE in an On-Error trigger.
BSQLCODE in an exception handler.
CDBMS_ERROR_CODE in an On-Error trigger.
DDBMS_ERROR_CODE in an exception handler.
正确答案： A解析： 暂无解析 -
第13题：
You are developing a client that sends several types of SOAP messages to a Windows Communication Foundation (WCF) service method named PostData. PostData is currently defined as follows:[OperationContract]void PostData(Order data);You need to modify PostData so that it can receive any SOAP message. Which code segment should you use？（）
A. [OperationContract(IsOneWay=true, Action="*", ReplyAction="*")] void PostData(Order data);
B. [OperationContract(IsOneWay=true, Action="*", ReplyAction = "*")] void PostData(BodyWriter data);
C. [OperationContract] void PostData(BodyWriter data);
D. [OperationContract] void PostData(Message data);
参考答案：D
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第14题：
Most IP layer-based proxy mechanisms，such as network address translation (NAT)，only supportuni-directional proxy，from the internal network to external network(the Interned．The proxvestablishes the communication channel by (71) IP addresses．The IP addresses must be (72) ．These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels，such as，multimedia applications．IP layer-based proxy mechanisms need additional software (73) for each application that uses (74) channels． SOCKS identifies communication targets through domain names，overcoming the restriction of Usina private IP addresses．SOCKS can use domain names to establish communication between separate LANs，with (75) IP addresses．
(66)
A．manufacturing
B．manipulating
C．conduct
D．implement
正确答案：B
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第15题：
Which of the following networks would MOST likely require EGP routing?()A. Networks that use OSPF in addition to static routes
B. Networks with classless Internet domain routing
C. Networks with multiple ISPs
D. Networks that use encryption
参考答案：C
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第16题：
Error detection schemes check errors in the data packets by reading which field frame IDs?()A.MTU
B.PDU
C.FCS
D.Flag
E.MAC
F.BRI
参考答案：C
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第17题：
Which of the following networks would MOST likely require EGP routing?（）
- A、Networks that use OSPF in addition to static routes
- B、Networks with classless Internet domain routing
- C、Networks with multiple ISPs
- D、Networks that use encryption
正确答案:C -
第18题：
For what two purposes does the Ethernet protocol use physical addresses？（）
- A、to uniquely identify devices at Layer 2
- B、to allow communication with devices on a different network
- C、to differentiate a Layer 2 frame from a Layer 3 packet
- D、to establish a priority system to determine which device gets to transmit first
- E、to allow communication between different devices on the same network
- F、to allow detection of a remote device when its physical address is unknown
正确答案:A,E -
第19题：
Error log analysis indicates that a disk is starting to fail and will need to be replaced. The failing disk contains multiple logical volumes which span multiple disks. A free disk has been added to the failing disk’s volume group.Which of the following is the most efficient method to move the data from the failing disk to the new disk？（）
- A、Back up the data， remove the failing disk from the volume group， then restore the data to the new disk.
- B、Use the migratepv command to move data from one disk to another and then remove the failing disk from the volume group.
- C、Use the mirrorvg command to mirror the data to the new disk， break the mirror and then remove the failing disk from the volume group.
- D、Create a new filesystem on the new disk and use the mv command to move the data to the new filesystem， and then remove the failing disk from the volume group.
正确答案:B -
第20题：
ou have a large amount of historical data in a flat file. Some analysts in your organization need to query thisdata in the file. The file is too large to load the data in it into your current database. Which is the most effectivemethod to access this data in your database（）
- A、Use the database link.
- B、Use the SQL*Loader utility.
- C、Use the Oracle Data Pump utility.
- D、Create an external table and leave the data in the flat file
正确答案:D -
第21题：
You are creating an undo buffer that stores data modifications.You need to ensure that the undo functionality undoes the most recent data modifications first.You also need to ensure that the undo buffer permits the storage of strings only.Which code segment should you use？（）
- A、Stack<string> undoBuffer=new Stack<string>（）；
- B、Stack undoBuffer=new Stack（）；
- C、Queue
<string> undoBuffer=new Queue <string>（）； - D、Queue undoBuffer=new Queue（）；
正确答案:A -
第22题：
单选题Error detection schemes check errors in the data packets by reading which field frame IDs?（）AMTU
BPDU
CFCS
DFlag
EMAC
FBRI
正确答案： B解析： 暂无解析 -
第23题：
单选题Two autonomous networks who wish to exchange routing data should use which of the following protocols?（）AOSPF
BBGP
CEIGRP
DIS-IS
正确答案： B解析： 暂无解析