| 1: | Which two TCP/IP protocols transmit e-mails across a network? List the acronyms and what they stand for. |
| A1: | Answer: Simple Mail Transfer Protocol (SMTP) and Post Office Protocol, Version 3 (POP3) |
| 2: | Fred and Barney each use a PC. They connect to the Internet using different ISPs. Describe the process by which Fred's e-mail to Barney traverses the Internet, in regard to which e-mail servers are used and how. |
| A2: | Answer: Fred sends the email to his ISP's e-mail server. That e-mail server sends the e-mail to Barney's ISP's e-mail server. Finally, Barney retrieves his e-mail from his own ISP's e-mail server. |
| 3: | In a typical network, which e-mail protocol does a client use to retrieve messages from a server? |
| A3: | Answer: POP3 |
| 4: | Describe the two parts of a typical e-mail address and tell what each part defines. |
| A4: | Answer: The format of an e-mail address is as follows: username@servername where the servername portion identifies the e-mail server for that user. The username portion identifies the individual user of that e-mail server. |
| 5: | Under which layer of the TCP/IP networking model do the e-mail protocols described in this chapter fall? |
| A5: | Answer: The TCP/IP application layer defines the protocols. |
| 6: | What does the acronym FTP stand for, and what is its main purpose? |
| A6: | Answer: The File Transfer Protocol (FTP) is an application layer TCP/IP protocol whose main purpose is to allow files to be transferred between a client and a server, and vice versa. |
| 7: | What are the names of the FTP operations to move a file to a server and move a file to a client? |
| A7: | Answer: FTP PUT refers to moving a file to the server, and FTP GET refers to moving a file from the server to a client. |
| 8: | Explain the usage of FTP servers for transferring a file from user1, which is connected to ISP1, to user2, which is connected to ISP2. In particular, point out to which servers each client moves the file. |
| A8: | Answer: Unlike e-mail servers, a single FTP server is required. Both user1 and user2 would need a working username and password on that server. So, user1 would move (put) the file to the FTP server, and later, user2 would connect to the server and get the file. |
| 9: | Considering the two main FTP commands to move files to and from an FTP server, which commands both move the file and delete the original file from the location it was copied? (For instance, if user1 moves file1.doc to an FTP server, does that delete file1.doc from user1's computer?) |
| A9: | Answer: Neither a GET nor a PUT deletes the original source file. |
| 10: | What term refers to the process of making sure a user is who he claims to be, before allowing him to use a server? |
| A10: | Answer: Authentication |
| 11: | What does the acronym HTTP stand for, and what is its main purpose? |
| A11: | Answer: The Hypertext Transfer Protocol (HTTP) is an application layer TCP/IP protocol whose main purpose is to allow files to be transferred between a web server and a web browser. |
| 12: | From what other standard did HTTP derive the first two letters in its name? |
| A12: | Answer: The Hypertext Markup Language (HTML) defines content of a website, formatting information, and other instructions. Because HTTP was originally defined to transfer HTML files, the first two letters behind the HTTP acronym are "Hypertext." |
| 13: | What HTTP operation does a browser use to request a particular file from a web server? |
| A13: | Answer: The HTTP GET command |
| 14: | What does the acronym URL stand for, and how is it used? |
| A14: | Answer: The Uniform Resource Locator identifies the protocol to be used, the name of the server, the name of a file at the server, and often the directory at the server in which the file resides. |
