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发布时间: 2023-06-21 17:54
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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 for all the objects within the class.
本题解析:
统一建模语言(UML)是一种广泛使用的信息系统可视化和文档化方法。UML可用于开发( 71 ),其中一个对象表示对信息系统重要的人、地点、事件或事务。系统分析人员在( 72 )期间定义对象的属性。对象还具有( 73 ),是对象在收到消息或命令时执行的任务或函数。一个( 74 )是一组类似的对象。如果对象类似于名词,那么属性类似于描述对象特征的形容词。对象可以有一个称为( 75 )的特定属性,该属性是描述对象当前状态的形容词。一个类中的所有对象都共享公共属性和方法,因此一个类就像是一个蓝图,或者类中所有对象的模板。
(71)
A.数据库模型
B.对象模型
C.事件模型
D.静态系统模型
(72)
A.系统维护过程
B.系统实施过程
C.系统设计过程
D.系统测试过程
(73)
A.方法
B.交互
C.接口
D.行为
(74)
A.参与者
B.实例
C.构件
D.类
(75)
A.状态
B.常量
C.实例
D.成员
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 for all the objects within the class.
本题解析:暂无解析
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 for all the objects within the class.
本题解析:暂无解析
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 for all the objects within the class.
本题解析:暂无解析
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 for all the objects within the class.
本题解析:暂无解析
为了控制IP报文在网络中无限转发,在IPv4数据报首部中设置了( )字段。
本题解析:
标识符表明数据分片是从哪个数据分出来的。首部长度表明IP首部长度。
生存周期限制了IP报文在因特网中转发的次数或时间,用于防止数据包在网络中无限转发。总长度表明IP数据报长度。
在Linux系统中,DNS配置文件的( )参数,用于确定DNS服务器地址。
本题解析:
resolv.conf是resolver类库使用的配置文件,每当一个程序需要通过域名来访问internet上面的其他主机时,需要利用该类库将域名转换成对应的IP,然后才可进行访问。
resolv.conf的关键字主要有四个,分别是:
①nameserver #定义DNS服务器的IP地址。
②domain #定义本地域名。
③search #定义域名的搜索列表。
④sortlist #对返回的域名进行排序。
最主要是nameserver关键字,如果没指定nameserver就找不到DNS服务器,其他关键字是可选的。nameserver表示解析域名时使用该地址指定的主机为域名服务器。其中域名服务器是按照文件中出现的顺序来查询的,且只有当第一个nameserver没有反应时才查询下面的nameserver。故本题应该选择A项。
用户在登录FTP服务器的过程中,建立TCP连接时使用的默认端口号是( )。
本题解析:
FTP服务基于传输层TCP协议,使用21和20端口,其中建立TCP连接使用端口21,数据传输使用端口20。22端口是默认的SSH端口,23端口主要用于Telnet(远程登录)服务。
使用电子邮件客户端从服务器下载邮件,能实现邮件的移动、删除等操作在客户端和邮箱上更新同步,所使用的电子邮件接收协议是( )。
本题解析:
电子邮件协议通常包括SMTP和POP3,其中SMTP是电子邮件发送协议,POP3是电子邮件接收协议。
MIME是多用途互联网邮件扩展,它是一个互联网标准,扩展了电子邮件标准,使其能够支持:非ASCII字符文本;非文本格式附件(二进制、声音、图像等);由多部分组成的消息体;包含非ASCII字符的头信息(Header information)。
IMAP和POP3的区别是:POP3协议允许电子邮件客户端下载服务器上的邮件,但是在客户端的操作(如移动邮件、标记已读等),不会反馈到服务器上,比如通过客户端收取了邮箱中的3封邮件并移动到其他文件夹,邮箱服务器上的这些邮件是没有同时被移动的。而IMIAP客户端的操作都会反馈到服务器上,对邮件进行的操作,服务器上的邮件也会做相应的动作。本题描述的是C项。
Cookie为客户端持久保持数据提供了方便,但也存在一定的弊端。下列选项中,不属于Cookie弊端的是( )。
本题解析:
Cookie作用如下:
(1)可以在客户端上保存用户数据,起到简单的缓存和用户身份识别等作用。
(2)保存用户的登录状态,用户进行登陆,成功登陆后,服务器生成特定的Cookie返回给客户端,客户端下次访问该域名下的任何页面,将该Cookie的信息发送给服务器,服务器经过检验,来判断用户是否登陆。
(3)记录用户的行为。
(4)通过加密和安全传输技术(SSL),减少Cookie被破解的可能性。只在Cookie中存放不敏感数据,即使被盗也不会有重大损失。控制Cookie的生命期,使之不会永远有效。偷盗者很可能拿到一个过期的Cookie。
Cookie弊端:
(1)增加流量消耗,每次请求都需要带上Cookie信息。
(2)安全性隐患,Cookie使用明文传输。如果Cookie被人拦截了,那人就可以取得所有的session信息。
(3)Cookie数量和长度的限制。每个domain最多只能有20条Cookie,每个Cookie长度不能超过4kB,否则会被截掉。D项。保存访问站点的缓存数据是Cookie的作用,而不是Cookie的弊端。
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