Basic - OSI (Open Systems Interconnect) Layers

L1 Physical

L2 Data Link

L3 Network

L4 Transport

L5 Session

L6 Presentation

L7 Application

The advantages of OSI standardization are:

• Standardization
• Interoperability ? Before OSI vendors used to do their own separate thing
• Well documented

Basic - TCP/IP Layers

-- Network Access

-- Transport

-- Internet

-- Application

The TCP/IP layers are mainly concerned with L4 and L4 of the OSI model.

• L1, L2 & L3 = Network Access
• L6, L7 = Application

Basic - MAC Address

Stands for Media Address Control

It is 48 bits long.

0260.8c01.1234

The first ?0260.8c01? is the vendor ID (a.k.a. Organization Unit Identifier)