(59)
- A．两子系统同时同步运行，当联机子系统出错时，退出服务，由备份系统接替
- B．备份系统处于电源开机状态，一旦联机子系统出错，立即切换到备份系统
- C．两子系统交替处于工作和自检状态，当发现一子系统出错时，它不再交替到工作状态
- D．两子系统并行工作，提高机器速度，一旦一个子系统出错，放弃并行工作
-
(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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