更多"[单选题]TCP头部和UDP头部都有的字段为（请作答此空）；（ ）字段"的相关试题:
[单选题]TCP头部和UDP头部都有的字段为（ ）；（请作答此空）字段是TCP头部有，而UDP头部没有的；当一个TCP连接处于（ ）状态时等待应用程序关闭端口。
A.目标端口号
B.顺序号
C.源端口号
D.校验和
[单选题]TCP头部和UDP头部都有的字段为（ ）；（ ）字段是TCP头部有，而UDP头部没有的；当一个TCP连接处于（请作答此空）状态时等待应用程序关闭端口。
A.CLOSED
B.ESTABLISHED
C.CLOSE-WAIT
D.LAST-ACK
[单选题]IP数据报的分段和重装配要用到报文头部的（请作答此空）个字段。其中，分片偏移字段（段偏置值）表示数的单位是（ ）字节；标记字段M标志（MF位）为0表示（ ）。
A.1
B.2
C.3
D.4
[单选题]TCP的标记部分包含的字段（请作答此空）表示含义是重新连接。
A.ACK
B.SYN
C.RST
D.PSH
[单选题]在交换机上通过(请作答此空) 查看到下图所示信息，其中State字段的含义是( )
A.display vrrp statistics
B.display ospf peer
C.display vrrp verboses
D.display ospf neighbor
[单选题]（请作答此空）是企业与消费者个人之间的电子商务，如京东、当当等，（ 此空不作答）是指线上购买线下的的商品和服务，实体店提货或享受服务，特别适合餐饮、院线、会所等服务连锁企业。
A.020
B.B2B
C.B2C
D.C2C
[单选题]（此空不作答 ）是企业与消费者个人之间的电子商务，如京东、当当等，（请作答此空）是指线上购买线下的的商品和服务，实体店提货或享受服务，特别适合餐饮、院线、会所等服务连锁企业。
A.020
A.B2B
B.B2C
C.C2
D.
[单选题]Certificates are（请作答此空）documents attesting to the （ ） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to（ ）someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （ ）date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital（ ）of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.
A.text
B.data]
C.digital
D.structured]
[单选题]以下设计模式中，（请作答此空）模式使多个对象都有机会处理请求。将这些对象连成一条链。并沿着这条链传递该请求。直到有一个对象处理为止。从而避免请求的发送者和接收者之间的耦合关系。（ ）模式提供一种方法顺序访问一个聚合对象中的各个元素。且不需要暴露该对象的内部表示。这两种模式均为（ ）
A.责任链（Chain of Responsibility）
B.解释器（Interpreter）
C.命令（Command）
D.迭代器（Iterator）
[单选题]（请作答此空）analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems.Ultimately,the system models become the（ ）for designing and constructing an improved system.（ ）is such a technique.The emphasis in this technique is process-centered.Systems analysts draw a series of process models called（ ）、（ ）is another such technique that integrates data and process concerns into constructs called objects.
A.Prototyping
B.Accelerated
C.Model-driven
D.Iterative
[单选题]The objective of (请作答此空) is to determine what parts of the application software will be assigned to what hardware. The major software components of the system being developed have to be identified and then allocated to the various hardware components on which the system will operate. All software systems can be divided into four basic functions. The first is (72). Most information systems require data to be stored and retrieved, whether a small file, such as a memo produced by a word processor, or a large database, such as one that stores an organization's accounting records. The second function is the (73), the processing required to access data, which often means database queries in Structured Query Language. The third function is the (74), which is the logic documented in the DFDs, use cases, and functional requirements. The fourth function is the presentation logic, the display of information to the user and the acceptance of the user's commands. The three primary hardware components of a system are (75).
A.architecture design
B.modular design
C.physical design
D.distribution design
[单选题]TCP/IP（请作答此空）layer protocols provide services to the application（ ）running on a computer.The application layer does not define the application itself,but rather it defines（ ）that applications need--like the ability to transfer a file in the case of HTTP.In short,the application layer provides an（ ）between software running on a computer and the network itself.The TCP/IP application layer includes a relatively large number of protocols,with HTTP being only one of those.The TCP/IP（ ）layer consists of two main protocol options--the Transmission Control Protocol（TCP）and the User Datagram Protocol（UDP）.
A.application
B.transport
C.link
D.network
[单选题]MIDI enables people to use（请作答此空）computers and electronic musical instruments.There are actually three components to MIDI,the communications"（ ）",the Hardware interface and a distribution（ ）called"Standard MIDI Files".In the context of the WWW,the most interesting component is the（ ）Format.In principle,MIDI files contain sequences of MIDI Protocol messages:However,when MIDI Protocol（ ）are stored in MIDI files,the events are also time-stamped for playback in the proper sequence.Music delivered by MIDI files is the most common use of MIDI today.
A.personal
B.electronic
C.multimedia
D.network
[单选题]TCP/IP （请作答此空）layer protocols provide services to the application（ ）running on a computer. The application layer does not define the application itself, but rather it defines（ ）that applications need--like the ability to transfer a file in the case of HTTP. In short, the application layer provides an（ ）between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP（ ）layer consists of two main protocol options--the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
A.application
B.transport
C.link
D.network
[单选题]MIDI enables people to use （请作答此空）computers and electronic musical instruments. There are actually three components to MIDI, the communications"（ ）", the Hardware interface and a distribution（ ）called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （ ）Format. In principle, MIDI files contain sequences of MIDI Protocol messages: However, when MIDI Protocol（ ）are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.
A.personal
B.electronic]
C.multimedia]
D.network
[单选题]BGP runs over a reliable transport （请作答此空）. This eliminates the need to implement explicit update fragmentation, retransmission, acknowledgement, and （ ）. Any authentication scheme used by the transport protocol may be used in addition to BGP's own （ ）mechanisms. The error notification mechanism used in BGP （ ）that the transport protocol supports a “graceful” close, i.e., that all outstanding data will be delivered （ ）the connection is closed.
A.protocol
B.moving
C.machine
D.gateway
