题1：引入多道程序设计技术的目的是(61)。

题2：某节点。(路由器)存放的路由信息如表3-1所示。

则该网络使用的路由算法最可能是(62)。节点A根据当前的路由信息计算出的到节点D的路由可能为(63)。将路由信息发送到其他节点所采用的基本算法是(64)。

为避免路由信息被重复发送，需要给路由信息包编号。设想每秒钟传送一次路由信息，为确保路由信息包的编号在1年内不重复使用，则编号的最短长度应为(65)位。

(93)

(91)

(92)

Multipurpose Internet Mail Extension(MIME)is a(71)document messaging standard in the Internet enviroment, with MIME, users can send(72)Email messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be(73)into messages. It defines the fonts, formats, and(74)features of a document so the document can be easily(75)on many different types of systems.

(90)

(88)

(86)

(87)

For each blank, choose the best answer from the four choices and write down on the answer sheet.

(66)is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(67)is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(68)functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(69)is the popular LAN developed under the direction of the IEEE 802.5.

(70)is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

(85)