根据以下Redhat Linux 9.0操作系统的提示信息，空缺处的Apache服务操作命令是(59)。  [root@gcz root] # service httpd start  [root@gcz root] #(59)httpd(pid 20014 20013 20012 20011 20010 20009 20008 20007 20004)正在运行…

(131)

(130)

(129)

(128)

Flow control is a function that prevents network congestion by ensuring that(71)do not overwhelm(72)with data.

 There are three commonly used methods for handling network congestion.(73)is used by network devices to temporarily store bursts of excess data in memory until they can be processed(74)are used by receiving devices to help prevent their buffers from overflowing.(75)is a flow-control scheme in which the source device requires an acknowledgment from the destination aider a certain number of packets have been transmitted.

(126)

(125)

(124)

(123)

SNMPv2增加了一个非原子的Get命令，可以做到(63)，SNMPv2增加的Inform命令使得网络管理的结构可以是(64)。SNMPv1的报文中除版本号和SNMPPDU外，还包括(65)，在 SNMPv2中，在原PDU的基础上增加了(66)信息。RMON2监视(67)层的通信。