Packet-switching wireless networks are preferable(71)when transmissions are(72)because of the way charges are(73)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(74)

题目

Packet-switching wireless networks are preferable(71)when transmissions are(72)because of the way charges are(73)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(74)for the(75)of time they use the network.

A．to

B．for

C．than

D．only

相似考题

1.He had no plans to retire _______he is now very comfortably off.(A) until(B) when(C) because(D) even though

2.● The （71） is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several （72）.（71）A. waterfall modelB. workflow reference modelC. evolutionary modelD. spiral model（72）A. workflow enginesB. processesC. workflow threadsD. tasks

3.A basic premise of OGSA is that everything is(71)by a service: a network enabled entity that(72)some capability through the exchange of messages. Computational resources, storage resources, networks, programs, databases, and so forth are all(73). This adoption of a uniform. service-oriented model means that all components of the environment are virtual. More specifically, OGSA represents everything as a Grid service: a Web service that conforms(74)a set of conventions and supports standard interfaces for such purposes as lifetime management. This core set of consistent interfaces, from which all Grid services are implemented,(75)the construction of hierarchical, higher-order services that can be treated in a uniform. way across layers of abstraction.A．definedB．representedC．usedD．passed

4.●A firewall is a (71) system designed to (72) an organization′s network against threats.(71) A．operatingB．programmingC．securityD．data(72) A．preventB．protectC．examineD．exploit

更多“Packet－switching wireless networks are preferable(71)when transmissions are(72)because of ”相关问题

  • 第1题：

    71-72

    第71题：


    正确答案：D

  • 第2题：

    ● One of the most widely used routing protocols in IP networks is the Routing Information Protocol (RIP). RIP is the canonical example of a routing protocol built on the （71）algorithm. Routing protocols in internetworks differ slightly from the idealized graph model. In an internetwork, the goal of the routers to forward packets to various （72）.

    Routers running RIP send their advertisement about cost every （73） seconds. A router also sends an update message whenever an update from another router causes it to change its routing table.

    It is possible to use a range of different metrics or costs for the links in a routing protocol. RIP takes the simplest approach, with all link costs being equal （74）. Thus it always tries to find the minimum hop route. Valid distances are 1 through （75）.This also limits RIP to running on fairly small networks.

    （71）

    A. distance vector

    B. link state

    C. flooding

    D. minimum spanning tree

    （72）

    A. computers

    B. routers

    C. switches

    D. networks

    （73）

    A. 10

    B. 30

    C. 60

    D. 180

    （74）

    A. 1

    B. 15

    C. 16

    D. length of the link

    （75）

    A. 6

    B. 10

    C. 15

    D. 16


    正确答案：A,D,B,A,C
    参考译文
        IP网络中广泛使用的路由协议之一是路由信息协议（RIP）。RIP是基于（71）路由算法的路由协议。网络中的路由协议与理想的图算法存在少量的差异。在互联网中，路由器的目的是将数据包转发给不同的（72）。
        运行RIP协议的路由器每 （73）秒广播一次路由信息，另外，每当路由器收到其他路由器的更新消息而导致其路由表变化时，就会发送更新消息。
        路由协议使用不同的度量或成本来建立连接是可能的。RIP采用了最简单的方法，所有链路的成本都等于（74）。这样，它总是试图寻找跳数最少的路径。有效的距离范围是从1到（75）。这也限制了RIP只能在相当小规模的网络上运行。
    参考答案
    　　（71）A（72）D（73）B（74）A（75）C

  • 第3题：

    Without proper safeguards,every part of a network is vulnerable to a security breach or unauthorized activity from（71）,competitors,or even employees.Many of the organizations that manage their own（72）network security and use the Internet for more than just sending/receiving e-mails experience a network（73）—and more than half of these companies do not even know they were attacked.Smaller（74）are often complacent,having gained a false sense of security.They usually react to the last virus or the most recent defacing of their website.But they are trapped in a situation where they do not have the necessary time and（75）to spend on security.

    A.users
    B.campuses
    C.companies
    D.networks

    答案：C
    解析：
    略

  • 第4题：

    Asystem's architecture is a representation of a system in which there is amapping of（71）onto hardware and softwarecomponents, a mapping of the（72）onto thehardware architecture. and a concern for the human interaction with thesecomponents. That is, system architecture is concerned with a total system, includinghardware. software, and humans.

    Softwarearchitectural structures can be divided into three major categories, dependingon the broad nature of the elements they show.1）（73）embodydecisions as a set of code or data units that have to be constructed orprocured.2）（74）embody decisions as to how the systemis to be structured as set of elements that have runtime behavior. andinteractions.3）（75）embody decisions as to how thesystem will relate to nonsoftware structures in its

    environment(suchas CPUs, file systems, networks, development teams, etc.).

    71.( )

    A.attributes

    B.constraint

    C.functionality

    D.requirements


    正确答案：C
    系统架构是一个系统的一种表示，包含了功能到软硬件构件的映射、软件架构到硬件架构的映射以及对于这些组件人机交互的关注。也就是说，系统架构关注于整个系统，包括硬件、软件和使用者。软件架构结构根据其所展示元素的广义性质，可以被分为三个主要类别。1）模块结构将决策体现为一组需要被构建或采购的代码或数据单元。2）构件连接器结构将决策体现为系统如何被结构化为一组具有运行时行为和交互的元素。3）分配结构将决策体现为系统如何在其环境中关联到非软件结构，如CPU、文件系统、网络、开发团队等。

  • 第5题：

    （72）

    A．computers

    B．routers

    C．switches

    D．networks


    正确答案：D

  • 第6题：

    1、下列序列中哪个是最小堆？

    A．2, 55, 52, 72, 28, 98, 71

    B．2, 28, 71, 72, 55, 98, 52 ‍

    C．2, 28, 52, 72, 55, 98, 71‍

    D．28, 2, 71, 72, 55, 98, 52


    2, 28, 52, 72, 55, 98, 71

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