List and explain the role of various internetworking devices used at different layers of osi model
Answers
Network devices used in different layers of OSI Model
Devices used in each layer are….
Physical layer or below : Hubs, Repeaters, Cables, Fibers, Wireless..
Data-link layer: Bridges, Modems, Network cards, 2-layer switches.
Network layer: Routers, Brouters, 3-layer switches.
Transport layer: Gateways, Firewalls.
Session layer: Gateways, Firewalls, PC's
"Devices used in each layer are:
1. Physical layer or below: Hubs, Repeaters, Cables, Fibres, Wireless. (a direct p2p connection)
2. Data-link layer: Bridges, Modems, Network cards, 2-layer switches. (a reliable p2p connection)
3. Network layer: Routers, Brouters, 3-layer switches. (Addressing, routing, and "delivery of datagrams" between points on a "network")
4. Transport layer: Gateways, Firewalls. (Reliable "delivery of segments")
5. Session layer: Gateways, Firewalls, PC's. (Interhost communication and managing sessions)
6. Presentation layer: Gateways, Firewalls, PC's. (Data representation, encryption/decryption, etc)
7. Application layer: Gateways, Firewalls, all end devices like PC's, Phones, Servers. (Network process to application)"