免费智能真题库 > 历年试卷 > 数据库系统工程师 > 2016年上半年 数据库系统工程师 上午试卷 综合知识
  第71题      
  知识点:   route
  关键词:   OS        章/节:   计算机专业英语       

 
In the fields of physical security and information security, access control is the selective restriction of access to a place or other resource. The act of accessing may mean consuming,entering, or using. Permission to access a resource is called authorization(授权).
An access control mechanism(71)between a user (or a process executing on behalf of a user) and system resources, such as applications, operating systems, firewalls; routers, files,and databases. The system must first authenticate(验证)a user seeking access. Typically the authentication function determines whether the user is (72) to access the system at all.
Then the access control function determines if the specific requested access by this user is permitted. A security administrator maintains an authorization database that specifies what type of access to which resources is allowed for this user. The access control function consults this database to determine whether to(73) access. An auditing function monitors and keeps a record of user accesses to system resources. 
In practice, a number of(74)may cooperatively share the access control function. All Operating systems have at least a rudimentary(基本的).and in many cases a quite robust, access control component. Add-on security packages can add to the (75)access control capabilities of the OS. Particular applications .or utilities, such as a database management system, also incorporate access control functions. External devices, such as firewalls, can also provide access control services .
 
 
  A.  cooperates
 
  B.  coordinates
 
  C.  connects
 
  D.  mediates
 
 
 

 
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   知识点讲解    
   · route
 
       route
        route命令的功能是显示和修改本地的IP路由表。如果不带参数,则给出帮助信息。
        1)语法格式
        
        2)参数说明
        .-f:删除路由表中的网络路由、本地环路路由和组播路由。
        .-p:与add命令联合使用时,一条路由被添加到注册表中,当TCP/IP启动时,用于初始化路由;与print命令联合使用时,则显示持久路由列表;对于其他命令,这个参数被忽略。
        .Command:表示要运行的命令,可用的命令有add(添加路由)、change(修改已有的路由)、delete(删除路由)和print(打印路由)。
        .Destination:说明目标地址,可以是网络地址、主机地址或默认路由。
        .mask Netmask:说明目标地址对应的子网掩码。
        .Gateway:说明下一跃点的IP地址。
        .metric Metric:说明路由度量值,通常选择度量值最小的路由。
        .if Interface:说明接口的索引。
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