关于OSI参考模型中说法不正确的是(19)。
- A．不同系统同等层之间按相应的协议进行通信，同一系统不同层之间通过接口进行通信
- B．只有最底层物理层完成物理数据传送，其他同等层之间的通信称为逻辑通信
- C．一般用户由最上层的应用层提供服务
- D．数据总是由物理层传输到应用层
-
(76)
- A．period
- B．days
- C．epoch
- D．phase
-
(74)
- A．scarcity
- B．lack
- C．deficiency
- D．shortage
-
(75)
- A．restrict
- B．limited
- C．imprison
- D．confine
-
Ipv6 is(71)for "Internet Protocol Version 6"。Ipv6 is the "next generation" protocol design by the IETF to(72)the current version Inernet Protocol, IP Version 4. Most of today's internet uses Ipv4, which is now nearly twenty years old. Ipv4 has been remarkably resilient in spite of its age, but it is beginging to have problems. Most importantly, there is a growing(73)of Ipv4 addresses, which are needed by all new machines added to the Internet. Ipv6 fixs a number of problems in Ipv4, shch as the(74)number of available Ipv4 addresses. It also adds many improvements to Ipv4 in areas such as souting and network autoconfiguration. Ipv6 is expected to gradually replace Ipv4, with the two coexing for a number of years during a transition(75)A.
- A．short
- B．abbreviate
- C．abbreviation
- D．initial
-
(73)
- A．substitution
- B．replace
- C．switchover
- D．swap
-
(71)
- A．FTP
- B．UDP
- C．IP
- D．HTTP
-
(69)
- A．Email address and IP address
- B．MAC address and port address
- C．MAC address and IP address
- D．port number and IP address
-
(70)
- A．full-duplex
- B．half-duplex
- C．simplex
- D．complex
-
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
- A(66)is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running on separate computers at tached to the network. A socket(67)two addresses:(68). Sockets provide a(
- A．program
- B．UDP
- C．socket
- D．TCP
-
(68)
- A．is made of
- B．composed of
- C．is composed of
- D．is consisted of
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