CompCh19-Answers to RQ

CompCh19-Answers to RQ - REVIEW QUESTIONS (COMP CHAPTER 19)...

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R EVIEW  Q UESTIONS  (C OMP  C HAPTER  19) Reviewing the Basics 1. Explain how a single physical computer can be a Web server and an e-mail server at the same time. Server functions can be controlled by software, and a single physical computer can be running more than one type of server software simultaneously. Programs on client PCs access the different servers running on the same machine through the use of port numbers assigned to the different server types. 2. Give the service and protocol for the following ports: port 21, port 25, port 80, and port 110. Port 21 is used for FTP (using FTP); port 25 is used for sending e-mail (using SMTP); port 80 is used for Web browsers and the World Wide Web (using HTTP); and port 110 is used for receiving e-mail (using POP3). 3. What are API calls used for? Why are they necessary? When an application wants to send data to a counterpart application on another host, it makes an API call to the operating system, which handles the request. The API call causes the OS to generate an HTTP request. 4. Which protocol used by Web browsers and Web servers is responsible for guaranteeing delivery? For breaking data into packets? For decrypting and decompressing data as
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necessary? TCP, IP, HTTP 5. Explain the difference between a connection- oriented protocol and a connectionless protocol, and give an example of each. A connection-oriented protocol such as TCP establishes a session before sending data. A connectionless protocol such as UDP sends data without establishing a session first, and without being concerned with whether the data is received. 6. What TCP/IP utility would you use to display the route taken over the Internet by a communication between a Web browser and Web server? Tracert 7. What utility would you use to display information about the name space kept by a DNS server for a particular domain name? NSLookup 8. Explain the functions of the following TCP/IP utilities: NSLookup, Winipcfg, Ipconfig, and Microsoft SNMP agent. NSLookup—Requests information about domain name resolutions from the DNS server’s zone data Winipcfg—Displays IP address and other configuration information in a user-friendly window (not available under Windows NT/2000/XP) Ipconfig—Displays the IP address of the host and other
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configuration information Microsoft SNMP Agent—Provides system management for networks; allows a system manager to monitor connections to computers running Windows 98 with SNMP Agent 9. What is the full command line to use Ipconfig
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CompCh19-Answers to RQ - REVIEW QUESTIONS (COMP CHAPTER 19)...

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