Week 2 Reading

Week 2: 

Readings: 

The Open Systems Interconnection (OSI) model describes seven layers that computer systems use to communicate over a network. There are 7 layers in the OSI model 

Application Layer

Presentation Layer 

Session Layer 

Transport Layer 

Network Layer 

Data Link Layer 

Physical Layer 

The Application layer is the top most layer of TCP/IP Model that provides the interface between the applications and network. Application layer is used exchange messages. Some of the devices used in Application layer are,

• PC’s (Personal Computer), Phones, Servers
• Gateways and Firewalls

Transport layer is responsible for end-to-end communication (or process-to-process communication). Some of the transport layer devices are, Firewalls and Gateways The network layer is responsible for creating routing table, and based on routing table, forwarding of the input request. Some of the Devices used in Network Layer are, Routers. A router helps you connect multiple devices to the Internet, and connect the devices to each other

 

Data Link layer is responsible to transfer data hop by hop (i.e within the same LAN, from one device to another device) based on the MAC address. Some of the devices used in Data Link layer are, Bridges, Modems and Internet Cards 

Physical layer of TCP/IP model is responsible for physical connectivity of two devices. Some of the devices used in Physical layers are, Cables, Hubs and Repeaters 

………………………………………………………………………………………………………………………………………………………………………………………..

 

 

 

 

 

 

 

.