아주대학교 컴퓨터네트워크 퀴즈 TCPIP Quiz1-2

1. (O/X) 다음 각 문항의 내용이 맞으면 O, 틀리면 X 를 적으시오. 단, X로 선택한 경우에는 모든 잘못된 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) In a client-server architecture, there is an always-on host with dynamic IP addresses, called the client, which services requests from many other hosts, called servers. (2) In the context of a communication session between a pair of processes, the process that initiates the communication is labeled as the server. The process that waits to be contacted to begin the session is the client. (3) The applications such as e-mail, remote terminal access, the Web, and file transfer, all use TCP primarily because TCP provides reliable data transfer, guaranteeing that all data will eventually get to its destination. (4) A web page consists of objects. An object is simply a file such as an HTML file, a JPEG image, a Java applet, or a video clip that is addressable by a single URL. Each URL has two components: the hostname of the server that houses the object and the object’s path name. (5) The first line of an HTTP response message has three fields: the method field, the URL field, and the HTTP version field. (6) FTP and SMTP send their control information through separate control connections, so called out-of-band. (7) The hierarchy of DNS servers consists of four classes of DNS serversroot DNS servers, toplevel domain (TLD) DNS servers, authoritative DNS servers and local DNS servers. (8) HTTP is mainly a pull protocolsomeone loads information on a Web server and users use HTTP to pull the information from the server at their convenience. In particular, the TCP connection is initiated by the machine that wants to receive the file. On the other hand, SMTP is primarily a push protocolthe sending mail server pushes the file to the receiving mail server. In particular, the TCP connection is initiated by the machine that wants to send the file. (9) P2P network is an