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Lesson 1
Internet services
All over the world, Linux systems routinely deliver Web pages, news articles, music, and other services to millions of users.
The journey from a user's computer to the Linux service, though, requires an intricate mesh of network hardware and software.
This module examines the different aspects of Internet services and how they work. IP addresses and the Domain Name System allow users to establish connections to Linux systems. Once there, port numbers and names give those users access to the services. Finally, standalone and transient network servers provide the actual service.

Learning objectives
After completing this module, you will be able to:
  1. Identify the properties of Internet Protocol
  2. Describe an IP address
  3. Relate TCP and UDP protocols to IP
  4. Define port numbers
  5. Explain the relationship between port names and numbers
  6. Configure port names
  7. Describe the function of the Domain Name System
  8. State the differences between a standalone and a transient network server
  9. List the advantages and disadvantages of standalone and transient network servers
The next lesson introduces properties of Internet Protocol.