Connected: An Internet Encyclopedia
Section 1 Review
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Connected: An Internet Encyclopedia
Up:
Programmed Instruction Course
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Section 1 - Introduction
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Next: Section 2 - Domain Naming
Section 1 Review
Section 1 Review
Congratulations! You've completed the first section of
the Programmed Instruction Course.
Let's summarize the topics covered in this section:
- Protocol
- A protocol is "a formal description of message formats and the rules two
or more machines must follow to exchange those messages."
- Protocols let us perform operations on other computers over a network.
- Many protocols can be in use at once.
- Protocols should be as specific to one task as possible.
- Standard
- Standards are protocols that everyone has agreed upon.
- Standard organizations exist to develop, discuss and enhance protocols.
- The most important Internet standard organization is the
Internet Engineering Task Force (IETF).
- The most important Internet standard documents are the
Requests For Comments (RFCs).
- Protocol Layering
- Protocols are usually organized by layering them atop one another.
- Protocol layers should have specific, well-defined functions.
- The most important protocol layering designs are the 4-layer
Department of Defense (DoD) Model, and the 7-layer Open System Interconnect
(OSI) Model.
- 4-Layer DoD Model
- The 4-layer DoD layered protocol model consists of the Process,
Host-to-Host, Internet, and Network Access Layers.
- The DoD Model was developed for the Internet.
- The core Internet protocols adhere to the DoD Model.
- Encapsulation
- Encapsulation happens when one protocol's message is embedded into
another protocol's message.
- Protocol layering is implemented through encapsulation.
Now, let's proceed into Section 2...
Next: Section 2 - Domain Naming
Connected: An Internet Encyclopedia
Section 1 Review