What is a network?

Issues in Providing Reliable Service

Issues in Providing Reliable Service (cont.)

   OSI Reference Model

   OSI Reference Model

   Physical Layer

   Data Link Layer

Sharing a Broadcast Channel

Sharing a Broadcast Channel (cont.)

   Example: Aloha

  Example: Aloha (cont.)

CSMA: Carrier Sense Multiple Access

   Ethernet

   Logical Link Control

Logical Link Control (cont.)

Logical Link Control: Flow Control

   Flow Control (cont.)

   Go-Back-N Protocol

Selective-Reject Protocol

   Network Layer

   Network Layer (cont.)

   Transport Layer

Connection
Management

   2-Way Handshake

   3-Way Handshake