2005年05月系统分析师考试上午真题【基础知识】-软考吧-您身边的软考专家-www.ruankaoba.com

2005年05月系统分析师考试上午真题【基础知识】

内容：基础知识
时间：120分钟
总分：75分
题数：75题

【60】1到1000的整数（包含1和1000）中至少能被2，3，5之一整除的数共有（60）个。

真题详情及解析

【61】用路由器把一个网络分段，这样做的好处是（61）。

真题详情及解析

【62】划分虚拟局域网（VLAN）有多种方式，不正确的划分方式是（62）。

真题详情及解析

【63】在距离矢量路由协议中，（63）可以防止路由循环。

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【64-65】关于kerberos和PKI俩种认证协议的叙述中正确的是（64），在使用kerberos认证时，首先向密钥分发中心发送初始票据（65）来请求会话票据，以便获取服务器提供的服务。

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