2007级计算机网络基础试卷及答案.doc

集 美 大 学 试 卷 纸 2009 — 2010 学年 第 二 学期 课程名称 计算机网络基础 试卷 卷别 A 适 用 学院、专业、年级 信息与计算科学2007级，数学与应用数学2007级，应用物理学2008级，光信息科学与技术2008级 考试 方式 闭卷 √ 开卷 □ 备注 答案请写在答题纸上，否则视为不得分。 一、选择题(共 30 分，每小题 2 分,选择符合题目要求的答案)。 1.Which of the following topologies are considered logical topologies? (Choose two.) a. broadcast b. star c. token-passing d. hierarchical e. bus f. mesh 2.Which of the following describe Ethernet MAC addresses? (Choose three.) a. 6 pairs of hex digits b. logical host address c. physical address d. 48 hex digits e. 32 bit network and 48 bit host address f. 24 bit OUI and 24 bit serial number 3.What is the name of the Layer 2 Protocol Data Unit(PDU)? a. data b. bit c. packet d. segment e. frame 4. Which combinations of charges will be repelled by electric force? (Choose two.) a. positive and positive b. negative and negative c. neutral and neutral d. neutral and negative e. positive and negative f. neutral and positive 5. Which type of cable has the color of the wires in pins #1 and #2 on one end appear on the other end at pins #3 and #6. a. straight-through cable b. hub connector cable c. rollover cable d. console cable e. crossover cable 6. Which items are contributors to latency in a switched network? (Choose two.) a. incorrect MAC addressing b. circuit delays c. software delays d. too many collision domains 7. Which switching mode results in the lowest amount of latency and provides no error checking? a. store-and-forward b. cut-through c. synchronous d. fragment-free 8. Which TCP/IP layer provides services that support a logical connection between the sending and receiving hosts? a. application b. transport c. ip d. network e. presentation 9. In what ways are the TCP/IP and OSI models the same? (Choose three.) a. Both assume circuit-switched networks. b. Both have similar transport and network layers. c. Both have an application layer d. Both have a physical layer. e. Both have network access and data-link layers. f. Both