아주대학교 컴퓨터네트워크 퀴즈 TCPIP Quiz1-1

1. (O/X) 다음 각 문항의 내용이 맞으면 O, 틀리면 X 를 적으시오. 단, X로 선택한 경우에는 이유를 함께 적으시오. 이유가 잘못된 경우에는 틀린 것으로 간주됩니다. 각 문항당 점수는 5점이며, 답을 잘못 적은 경우 경우에는 0점이 아닌 -5점을 받게 되니 주의하여 답을 작성하시오. (1) The TCP service model includes a connectionless service and a reliable data transfer service. (2) HTTP is a stateless protocol. However, it is often desirable for a Web site to identify users, either because the server wishes to restrict user access or because it wants to serve content as a function of the user identity. For these purposes, HTTP uses cookies. (3) In non-persistent connections in HTTP, all of the requests and their corresponding responses are sent over the same TCP connection. (4) FTP sends the control information out-of-band, while HTTP sends it in-band. (5) When a user agent accesses and obtains the mail messages from its mail box in a mail server, it uses SMTP. (6) DNS provides a directory service that translates hostnames to IP addresses only. (7) There are three classes of DNS servers: root DNS servers, top-level domain (TLD) servers, and local DNS servers. (8) P2P network is an overlay network, in which the peers form an abstract logical network which resides above the “underlay” computer network consisting of physical links, routers, and hosts.