信元是信元交换的单位。为控制差错，在信元中包括CRC校验和，其生成公式为(22)，校验和对(23)进行校验。信元交换采用(24)技术进行复用。在交换过程中，当实施VP交换时，其中VPI、VCI的变化情况是(25)。如果在交换过程中出现拥塞，该信息被记录在信元的(26)中。
-
(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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