Chapter 12
Application Layer Services
Objectives
Upon completion of this chapter, you will be able to answer the following questions:
What are common network applications?
How does DNS operate?
How do HTTP and HTML operate?
How does FTP operate?
How do Telnet and SSH operate?
How do email protocols operate?
Key Terms
This chapter uses the following key terms. You can find the definitions in the Glossary.
Domain Name System (DNS) page 231
File Transfer Protocol (FTP) page 235
Hypertext Markup Language (HTML) page 233
Hypertext Transfer Protocol (HTTP) page 233
Internet Message Access Protocol (IMAP) page 241
Post Office Protocol (POP) page 241
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