单选题如图所示，SwitchA通过SwitchB和NMS跨网段相连并正常通信

单选题Network frewalls are security devices used to stop or mitigate () access to private networks connected to the Internet, especially intranets. The only trafle alowed on thev network is defined via firewall ( )-any other taff attempting to access the network is blockeD. Network firewalls sit at the ( ) line of a network, acting as a communicationsliaison between intemal and gxtemal devics, When properly configured, a firewall alws users to access any of the resources they need while simultaneously keeping out unwanted accesses. In addition to limiting access to a protected computer and network, a firewall can (回答此处 ) all traffit coming into or leaving a network, and manage remote access to a private network through secure authentication grtificates and logins. ( ) firewalls examine every packet that passes through the network and then accep or deny it as defined by rules set by the user.

单选题在 TCP 协议连接释放过程中，请求释放连接的一方（客户端）发送连接释放报文段，该报文段应该将（）。

单选题（ ）指用计算机平均每秒能执行的百万条指令数来衡量计算机性能的一种指标。

单选题通常使用（ ）为IP数据报文进行加密。

单选题以下网络控制参数中，不随报文传送到对端实体的是（ ）。

单选题Network frewalls are security devices used to stop or mitigate () access to private networks connected to the Internet, especially intranets. The only trafle alowed on thev network is defined via firewall ( )-any other taff attempting to access the network is blockeD. Network firewalls sit at the (回答此处 ) line of a network, acting as a communicationsliaison between intemal and gxtemal devics, When properly configured, a firewall alws users to access any of the resources they need while simultaneously keeping out unwanted accesses. In addition to limiting access to a protected computer and network, a firewall can ( ) all traffit coming into or leaving a network, and manage remote access to a private network through secure authentication grtificates and logins. ( ) firewalls examine every packet that passes through the network and then accep or deny it as defined by rules set by the user.

单选题网络设备发生故障时，会向网络管理系统发送（）类型的 SNMP 报文。

单选题Windows系统中，DHCP客户端通过发送（ 此空作答 ）报文请求IP地址配置信息，当指定的时间内未接收到地址配置信息时，客户端可能使用的 IP 地址是（ ）。

单选题X.509数字证书标准推荐使用的密码算法是( )，而国密SM2数字证书采用的公钥密码算法是(回答此处 )。

单选题Windows Server 2008 R2 上配置（）服务器前需要先安装 IIS 服务。

单选题Network Address Translation NATis an Internet standard that enables a local-area network to use one set IP addresses for internal traffic and another set of（ 此空作答 ）IP addresses for external traffic. T

单选题下列命令中，不能用于诊断DNS故障的是(61)________________。

单选题在BGP4协议中，路由器通过发送(24)________________报文将正常工作信息告知邻居

单选题( )存储方式常使用多副本技术实现数据冗余。

单选题PC1的IP地址为192.168.5.16， PC2的IP地址为192.168.5.100，PC1和PC2在同一网段中，其子网掩码可能是_

单选题使用（ ）格式的文件展示视频动画可以提高网页内容的载入速度。

单选题云计算有多种部署模型，当云按照服务方式提供给大众时，移为（ ）

单选题HDLC 协议中， 帧的编号和应答号存放在 字段中。