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lec22

This is continuation of previous lecture where MAC protocols are covered in brief.

Taking turns

Let's now describe various methods to achieve turn taking.

  1. polling:

    • master invites slaves to transmit data

  2. token rings:

    • control token passed from node to node

ARP: Address Resolution Protocol

Protocol to determine MAC address on a given device in a network.

Upon association the protocol will emplace an entry into the target device's arp table where we record MAC and IP address associations.

Wireless links

Interference: everything will cause interference which means we expect interference.

Primarily for wireless connections: Code Division Multiple Access(asynchronus kinda)

CDMA

Each node receives a code which it uses to splice transmissions across the wireless link. Each node may transmit data at an arbitrary rate since the transmissions splice into each other forming a consistent signal cumulatively.