Chapter 2. The OSI Model

THE FOLLOWING NETWORK+ EXAM OBJECTIVES ARE COVERED IN THIS CHAPTER:

• 1.2 Specify the main features of 802.2 (Logical Link Control), 802.3 (Ethernet), 802.5 (Token Ting), 802.11 (wireless), and Fiber Distributed Data Interface (FDDI) networking technologies, including:

  • Speed

  • Access method (CSMA/CA [Carrier Sense Multiple Access/Collision Avoidance] and CSMA/CD [Carrier Sense Multiple Access/Collision Detection])

  • Topology

  • Media

• 2.1 Identify a MAC (Media Access Control) address and its parts.

• 2.2 Identify the seven layers of the OSI (Open Systems Interconnect) model and their functions.

• 2.3 Identify the OSI (Open Systems Interconnect) layers at which the following network components operate:

  • Hubs

  • Switches

  • Bridges

  • Routers

  • NICs (network interface cards)

  • WAPs (wireless access points)

• 2.4 Differentiate between the following network protocols in terms of routing, addressing schemes, interoperability, and naming conventions:

  • IPX/SPX (Internetwork Packet Exchange/Sequenced Packet Exchange)

  • NetBEUI (Network Basic Input/Output System Extended User Interface)

  • AppleTalk/AppleTalk over IP (Internet Protocol)

  • TCP/IP (Transmission Control Protocol/Internet Protocol)