Title Unit-III Data Communication (1).pdf ✅

UNIT-III SWITCHED COMMUNICATION NETWORKS: 1. CIRCUIT, 2. MESSAGE, 3. PACKET & 4. HYBRID SWITCHING,
Switching Networks  Long distance transmission is typically done over a network of switched nodes  Nodes not concerned with content of data  End devices are stations  Computer, terminal, phone, etc.  A collection of nodes and connections is a communications network  Data routed by being switched from node to node
Nodes Nodes may connect to other nodes only, or to stations and other nodes Node to node links usually multiplexed Network is usually partially connected Some redundant connections are desirable for reliability Two different switching technologies Circuit switching Packet switching
Simple Switched Network