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Chapter 2 Network Models (OSI (Physical (Bits, Wire connections, NICs,…
Chapter 2 Network Models
Why are they important?
Act as guidelines to breakdown how a network functions in layers
OSI
Application
Session
Transport
Segments
Presentation
Network
Packets
Data-Link
Frames
NIC
MAC Address
48 Bits
First 6 Organizationally Unique
Last 6 Device ID
12 Hex Characters
Example: f8:bc:12:6b:89:82
2 Jobs
LLC - Logical Link Control
Talks to OS
Multiple Protocols
Flow Control
MAC - Media Access Control
Creates and addresses the Frame
Add NIC's own MAC and attaches to frame
Adds FCS
Ensures completed frames are then sent along cable
Physical
Bits
Wire connections
NICs
Hubs / Switches