SNMPv2增加了一个非原子的Get命令,可以做到(46),SNMPv2增加的 Inform命令使得网络管理的结构可以是(47)。SNMPv1的报文中除版本号和SNMP PDU外,还包括(48),在SNMPv2中在原PDU的基础上增加了(49)信息。 RMON2监视(50)层的通信。
(143)
(142)
(141)
(140)
(138)
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in small pieces over a number of the(71)frequencies available for use at any time in the specified range. Devices using(72)spread spectrum(DSSS)communicate by(73)each byte of data into several parts and sending them concurrently on different(74). DSSS uses a lot of the available(75), about 22 megahertz(MHz).
(137)
(136)
(135)
For each blank, choose the best answer from the four choices and write down on the answer sheet.
(66)is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group.
(67)is an error detection code that most data communication networks use.
(68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(69)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.
(70)is an identifier of a web page.
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