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用看的、听的学真题
study by eyes and ears.
2027中级数据库系统工程师培训报名
2027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：160题
【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
【67】假设网络的生产管理系统采用B/S工作方式，经常上网的用户数为100个，每个用户每分钟产生11个事务处理，平均每个事务处理的数据量大小为0.06MB，则这个系统需要的信息传输速率为
（67）
。
真题详情及解析
【68】在异步通信中，每个字符包含1位起始位、7位数据位、1位奇偶位和2位终止位，每秒钟传送100个字符，则有效数据速率为
（68）
。
真题详情及解析
【67】假设生产管理网络系统采用B/S工作方式，经常上网的用户数为200，每个用户平均每分钟产生8个事务处理，每个事务处理的规模平均为0.05MB，则这个系统需要的信息传输速率为
（67）
。
真题详情及解析
【7】在异步通信中，每个字符包含1位起始位、7位数据位、1位奇偶位和2位终止位，每秒钟传送100个字符，采用4相相位调制，则有效数据速率为
（7）
。
真题详情及解析
【37】某条上海到乌鲁木齐的线缆长为4120km，传输带宽峰值为155Mb/s，信号在导体中的传输速度为光速的2/3，那么平均有
（37）
字节正在光缆中通行（光速为300.000km/s）。
真题详情及解析
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