Chapter 1

The OSI Model and Encapsulation

This chapter covers the following topics related to Objective 1.1 (Compare and contrast the Open Systems Interconnection [OSI] model layers and encapsulation concepts) of the CompTIA Network+ N10-008 certification exam:

  • OSI model

    • Layer 1—Physical

    • Layer 2—Data link

    • Layer 3—Network

    • Layer 4—Transport

    • Layer 5—Session

    • Layer 6—Presentation

    • Layer 7—Application

  • Data encapsulation and decapsulation within the OSI model context

    • Ethernet header

    • Internet Protocol (IP) header

    • Transmission Control Protocol (TCP)/User Datagram Protocol (UDP) headers

    • TCP flags

    • Payload

    • Maximum transmission unit (MTU)

Way back in 1977, the International Organization for Standardization (ISO) developed a subcommittee to focus on ...

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