题目内容

网管人员在监测网络运行状态时,发现下列现象:服务器上有大量的 TCP连接,收到了大量源地址各异、用途不明的数据包;服务器收到大量的 ARP报文。网管人员的判断是( 54),针对前一现象将采取的措施是(55),针对后一现象可能采取的措施是(56)。 空白处(55)应选择()

A. 暂时关闭服务器
B. 暂时关闭出口路由器
C. 修改防火墙配置过滤不明数据包
D. 修改 IDS配置使其保护服务器不受攻击

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The network layer provides services to the transport layer. It can be based on either(71). In both cases,its main job is (72) packets from the source to the destination. In network layer,subnets can easily become congested,increasing the delay and(73)for packets. Network designers attempt to avoid congestion by proper desing,Techniques include (74) policy,caching,flow control,and more. The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client,traffic shaping,resource(75),and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiatd services, and MPLS. 空白处(73)应选择()

A. lowering the throughput
B. lowering the correctness
C. lowering the effectiveness
D. lowering the preciseness

PowerBuilder9.0中,开发空间有三个层次:Workspace(工作空间)、Target(目标)和________。

某园区有多栋房屋,每栋房屋都通过光缆连接到机房的同一设备上,现在其中一栋房屋内的用户不能访问 Internet,引起这一故障现象的原因首先应判断为( 34),采取相应措施后,故障依然存在,此时最可能的问题是(35)。 空白处(35)应选择()

A. 该栋楼房的光终端设备损坏
B. 用户机器的协议
C. VLAN配置错误
DHCP服务器故障

简述物理数据独立性与逻辑数据独立性的含义。

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