1b. ethernet (38 slide)

CSMA/CD

LOCAL AREA NETWORKS (LANS)

Minimum frame length/Transmission rate is proportional to Collision domain / Propagation speed

Ethernet layers

Ethernet frame

Ethernet implementation

Ethernet implementation

Ethernet implementation

Ethernet implementation

Fast Ethernet implementation

Fast Ethernet implementation

Fast Ethernet implementation

Gigabit Ethernet implementation

Gigabit Ethernet implementation

Token passing

Token passing

Token passing

Token passing

Data frame

MAU

Spread spectrum techniques

Spread spectrum techniques

ISM bands

BSSs

ESS

CSMA/CA

CONNECTING DEVICES

Connecting devices

Repeater

A repeater connects segments of a LAN together.

A repeater forwards every packet; it has no filtering capability.

Hubs

A bridge has a table used in filtering decisions.

Bridge

A bridge connects segments of a LAN together.

A router is a three-layer (physical, data link, and network) device.

A repeater or a bridge connects segments of a LAN. A router connects independent LANs or WANs to create an internetwork (internet).

Routing example

A router changes the physical addresses in a packet.