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用看的、听的学真题
study by eyes and ears.
2026中级信息安全工程师培训报名
2026高级系统分析师培训报名
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系统分析师
第4章 计算机网络与分布式系统
真题列表
第4章 计算机网络与分布式系统
总题数：155题
【71-75】The objective of the systems analysis phase is to understand the proposed project,ensure that it wil1 support business requirements, and build a solid foundation for systemdevelopment. The systems analysis phase includes four main activities.
（71）
involves fact-finding to describe the current system and identification of the requirements for the newsystem, such as outputs， inputs，processes,performance,and security.
（72）
refer to thelogical rules that are applied to transform the data into meaningful information.
（73）
continuesthe modeling process by learning how to represent graphica1ly system data and processes usingtraditional structured ana1ysis techniques.
（74）
combines data and the processes that act onthe data into objects. These objects represent actual people, things，transactions，and eventsthat affect the system. In
（75）
, we wil1 consider various development options and preparefor the transition to the systems design phase of the SDLC.
真题详情及解析
【71-75】Unified Modeling Language （UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop
（71）
, in which an object represents a person, place, event, or transaction that is significant to the information system. Systems analysts define an object
,
s attributes during the
（72）
. An object also has
（73）
, which are tasks or functions that the object performs when it receives a message, or command, to do so. A(n)
（74）
is a group of similar objects. If objects are similar to nouns,attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a(n)
（75）
, which of an object is an adjective that describes the object，s current status. All objects within a class share common attributes and methods, so a class is like a blueprint, or template fbr all the objects within the class.
真题详情及解析
【71-75】During the systems planning phase, a systems analyst conducts a
（71）
activity to study the systems request and recommend specific action. After obtaining an authorization to proceed, the analyst interacts with
（72）
to gather facts about the problem or opportunity,project scope and constraints, project benefits, and estimated development time and costs.In many cases, the systems request does not reveal the underlying problem, but only asymptom. A popular technique for investigating causes and effects is called
（73）
.
The analyst has analyzed the problem or opportunity, defined the project scope and constraints, and performed
（74）
to evaluate project usability, costs, benefits, and time constraints. The end product of the activity is
（75）
. The main content must include an estimate of time, staffing requirements, costs, benefits, and expected results for the next phase of the SDLC.
真题详情及解析
【71-75】The purpose of the systems analysis phase is to build a logical mode1 of the new system.The first step is
（ 71）
,where you investigate business processes and document what the new system must do to satisfy users. This step continuesthe investigation that began during the
（72）
.You use the fact-finding results to build business models，data and processmodels , and object models. The deliverable for the systems analysis phase is the
（73）
, which describes managementand user requirements , costs and benefits , and outlines alternative development strategies.
The purpose of the systems design phase is to create a physical model that will satisfy a11 documented requirementsfor the system.During the systems design phase，you need to determine the
（74）
， which programmers wil1 use to transformthe logical design into program modules and code.The deliverable for this phase is the
（75）
, which is presented tomanagement and users for review and approva1.
真题详情及解析
【71-75】A variety of tools is available to help the analyst to discover the users' true needs.These tools are grouped into three broad techniques that are based on the degree of change anticipated in the to-be system - Business process
（71）
is used when the basic business Requirements outlined in the system request focus on employing computer technology in some aspect of the business process. Two popular activities used in the technique are
（72）
. Business process
（73）
means that the basic business requirements target moderate changes to the organization' s operations.
（74）
are three popular activities in the technique. Business process
（75）
means changing the current way of doing business and making major changes to take advantage of new ideas and new technology.
真题详情及解析
【71-75】A requirement is simply a statement of what the system must do or what characteristics it needs to have. Requirements evolve from broad statements of overall
（71）
from the system to detailed statements of the business capabilities that a system should support to detailed technical statements of the way in which the capabilities will be implemented in the new system.
（72）
focus on describing how to create the software product that will be produced from the project Nonfunctional requirements are primarily used in the design phase when decisions are made about the user interface, the hardware and software, and the system's underlying architecture. The system's physical and technical environments would be considered
（73）
. The speed, capacity, and reliability of the system belong to
（74）
.
（75）
describes that who has authorized access to the system under what circumstances.
真题详情及解析
【66-70】WLANs are increasingly popular because they enable cost-effective connections among people，applications and data that were not possible，or not cost-effective， in the past. For example， WLAN-based applications can enable fine-grained management of supply and distribution
（66）
to improve their efficiency and reduce
（67）
. WLANs can also enable entirely new business processes．To cite but one example， hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall
（68）
care．WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example， they can protect corporate data by preventing
（69）
through rogue access points. They help control salary costs， by allowing IT staffs to manage larger networks without adding staff. And they can improve overall network management by integrating with customers’ existing systems， such as Open View and UniCenter. Fortunately， it isn’t necessary to measure these benefits to justify investing in WLAN management solutions，which can quickly pay for themselves simply by minimizing time-consuming
（70）
and administrative chores.
真题详情及解析
【66-70】when the system upon which a transport entity is running fails and subsequently reatarts，the
（66）
information of all active connections is lost.the affected connections become half-open，as the side that did not fail does not yet realize the promble.
The still active side of a half-open connections using a
（67）
timer.this timer measures the time transport machine will continue to await an
（68）
of a transmitted segment after the segment has been retransmitted the maximum number of times.when the timer
（69）
，the transport entity assumes that either the other transport entity or the intervening network has failed.as a result，the timer closes the connection，and signals an abnormal close to the TS user.
In the event that a transport entity fails and quickly restart，half-open connections can be teminated more quickly by the use of the RST segment.the failed side returns an RST I to every segment I that it receives.when the RST I reaches the other side，it must be checked for validity dased on the
（70）
number I，as the RST could be in response to an old segment .if the reset is valid，the transport entity performs an abnormal termination.
真题详情及解析
【71-75】astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost
（71）
.for example， the maintenance of multiple networks can require additional staff. often， this staff must be trained on multiple vendor technologies， sometimes requiring parallel groups specializing in each
（72）
hence， additional maintenance procedures must be maintained and administrative records are
（73）
the duplication of trasport facilities to carry
（74）
network traffic is an inefficient use of resources and， not surprisingly， more technologies installed in a central office mean the necessity for more physical space， and an increase in power connections and power consumption. migration of these
（75）
network elements to IP-based DCns is alogical strategy.
真题详情及解析
【64】在地面上相距2000公里的两地之间利用电缆传输4000比特长的数据包，数据速率为64kb/s，从开始发送到接收完成需要的时间为
（64）
。
真题详情及解析
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