天津理工大学 计算机网络题库.doc

PART Ⅰ: Choice B 1. Which of the following services does not the transport layer provide for the application layer? In-order delivery of data segments between processes Best effort delivery of data segments between communicating hosts Multiplexing and demultiplexing of transport layer segments Congestion control A 2. What are the two of the most important protocols in the Internet? A. TCP and IP B. TCP and UDP C. TCP and SMTP D. ARP and DNS C 3. The Internet provides two services to its distributed applications: a connection oriented reliable service and a ( ). A. connection oriented unreliable service B. connectionless reliable service C. connectionless unreliable service D. In order data transport service D 4. Processes on two different end systems communicate with each other by exchanging ( ) across the computer network. A. packets B. datagram C. frames D. messages A 5. The job of delivering the data in a transport-layer segment to the correct socket is called ( ). A. demultiplexing B. multiplexing C. TDM D. FDM C 6. Two important reasons that the Internet is organized as a hierarchy of networks for the purposes of routing are: Least cost and maximum free circuit availability Message complexity and speed of convergence Scale and administrative autonomy Link cost changes and link failure B 7. Which of characters is not distance-vector algorithm’s characters？（ ） A. iterative B. global C. asynchronous D. distributed D 8. The length of IPV6 address is （ ）bits. A. 32 B. 48 C. 64 D. 128 C 9. The host component of a CIDR address of the form a.b.c.d/25 can contain addresses for: 225 hosts (minus “special” hosts) 512 hosts (minus “special” hosts) 2(32-25) hosts (minus “special” hosts) 25 hosts (minus “special” hosts) C 10. The primary function of the address resolution protocol (ARP) that resides in Internet hosts and routers is: To provide LAN router functions To translate between