南京信息工程大学2009-2010学年第一学期Internet Technologies课程试卷及答案(A卷).pdf

1 南京信息工程大学试卷南京信息工程大学试卷 20092009 2012010 0学年第学年第 一一学学期期InternetInternet TechnologieTechnologies s课程试卷课程试卷 A A 卷卷 本试卷共本试卷共3 3页页 考试时间考试时间 120120 分钟分钟 任课教师任课教师朱节中 出卷时间出卷时间 09年年 1212 月月 系专业年级班 学号姓名得分 A Fill in the blanks 10X1score 10scores 1 Scientists and engineers devised ways to build networks that connected multiple computers across large geographic distances which is calledinternetor long haul networks 2 is the Internet s origins 3 Web pages are written in a computer language which ishtml 4 HTTP uses what numeric value in decimal of the destination port field of the TCP header 80 5 POP3 protocol we use to receive email 6 Ancan be used to protect a private network from outside attack 7 Today there are encryption systems that use two keys one for encryption and one for decryption The key used for decryption is called a public keybecause it must be kept secret The key used for encryption is called aprivate keybecause it can be distributed to anyone 8 The standard protocol for remote login is known aspop3 9 The HTML taginstructs a browser to begin a new line B Explain abbreviation 10X2 20scores 1 TCP Transmission Control Protocol 2 UDP User Datagram Protocol 3 HTTP HyperText Transfer Protocol 4 FTP File Transfer Protocol 5 WWW World Wide Web 6 SMTP Simple Mail Transfer Protocol 7 DNS Domain Name System 8 HTML HyperText Mark up Language 9 IP Internet Protocol 10 ADSL Asymmetric Digital Subscriber Line C Short answer 55scores 2 1 What s OSI reference model What s TCP IP reference model Please use figure to explain your answer 10 scores 物理层 Physical Layer 数据链路层 Datalink Layer 网络层 Network Layer 传输层 Transport Layer 会话层 Session Layer 表示层 Presentation Layer 应用层 Application Layer 应用层 application layer 传输层 transport layer 互连层 internet layer 主机 网络层 host to network layer 2 Since all outgoing datagrams have the same return address how can a NAT box know which computer should receive a response datagram that arrives from the Internet 10 scores A NAT box keeps a record of what each computer is doing When a datagram arrives from the Internet the NAT box consults its records to determine which computer should receive the datagram The NAT box replaces the to address of an incoming datagram with the local address of the correct destination computer 3 Please write the correct router table of R3 in the below figure Note The packet can arrive any subnet by router 15 scores subnet2 202 212 2 0 subnet1 138 210 0 0 R3 R2 R1 subnet4 138 220 0 0 subnet3 138 215 0 0 subnet5 138 206 0 0 202 212 2 5 138 210 1 0138 215 1 5 138 215 1 8 138 220 1 0 138 206 1 0 138 220 2 0 3 4 Please explain these header keywords Received Date From To Subject in the below figure 10scores Received Date From To Subject Received line added by each transfer agent along the route Date the date and the time the message was sent From people who create the message To Email address of primary recipient Subject shot summy of the message for the one line display 5 What is URL Please explain simply 10 scores Uniform Universal Resource Locator Also known as web addresses the Internet address of a resource on the standard Address An identifier u