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采用脉码调制(PCM)方法对声音信号进行编码，若采样频率为8000Hz，量化级为256级，那么数据传输率要达到 (10) 。
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在Linux操作系统下安装网卡，如果操作系统没有内置的驱动程序，那么用户必须 (20) ，才能完成该网卡驱动程序的安装。
未依法进行征用土地公告的，被征地农村集体经济组织、农村村民或者其他权利人有权依法要求公告，有权拒绝办理征地补偿登记手续。( )
在配置命令frame-relay map ip 192.168.1.1 dlci 101 broadcast中，数字101的含义是 (50) 。
(66) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. (67) , an application-layer protocol, authenticates each peer in an IPsec transaction. IKE negotiates security policy, determining which algorithm may be used to set up the tunnel. It also handles the exchange of session keys used for that one transaction. Networks that use (68) to secure data traffic can automatically authenticate devices by using (69) , which verify the identities of the two users who are sending information back and forth. IPsec can be ideal way to secure data in large networks that require secure connections among many devices. Users deploying IPsec can (70) their network infrastructure without affecting the applications on individual computer. The protocol suite is available as a software-only upgrade to the network infrastructure. This alows security to be implemented without costly changes to each computer. Most important, IPsec allows interoperability among different network devices, PCs and other computing systems.
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