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OSI Model Layers in Computer Networks Basics for Bank Exams 2018

OSI Model Layers in Computer Networks Basics for Bank Exams 2018

OSI Model Layers in Computer Networks Basics for Bank Exams 2018

Online bank coaching classes : The OSI model defines a networking framework to implement protocols in seven layers. It is used to transmit data from sender to receiver. It is an important concept from bank exams point of view thus we are discussing this model in detail:

OSI Model Layers in Computer Networks Basics

LAYER 1- PHYSICAL LAYER:

The physical layer is the lowest layer of the OSI model whose main function is to provide the hardware elements such as cables, repeaters, and network interface cards for sending and receiving data on a carrier network.

Networking Device – Hub, NIC, repeater, gateway

Protocol Data Unit – Bit

Some Protocols – Ethernet

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LAYER 2 – DATA LINK LAYER:

The main function of data link layer is to provide error-free transmission of data frames from one node to another over the physical layer.

Networking Device – Bridge, Ethernet Switches, proxy server, gateway

Protocol Data Unit – Frame

Some Protocols – Ethernet, PPP

 

LAYER 3 – NETWORK LAYER:

In the Network layer, the source and destination addresses are scanned to confirm if the data has reached its final destination. The addresses are contained inside each frame.

Networking Device – Router, multi layer switches, gateway, proxy server

Protocol Data Unit – Packets

Some Protocols – ARP, IPv4/IPv6, Internet Protocol, IPX.

 

LAYER 4 – TRANSPORT LAYER:

In Transport Layer, transmission of data took place between end systems, or hosts, and is accountable for end-to-end error recovery and flow control.

 

Networking Device – proxy server, gateway

Protocol Data Unit – TCP, UDP

Some Protocols – SPX, TCP

 

LAYER 5 – SESSION LAYER:

The session layer sets up, coordinates and terminates communicative sessions.

Networking Device – gateway, Logical Ports

Protocol Data Unit – Data/Session

Some Protocols – AppleTalk, RPC

 

LAYER 6 – PRESENTATION LAYER

The Presentation layer is the sixth layer in the OSI model, whose main function is to translate, encrypt & compress data.

Networking Device – gateway

Protocol Data Unit – Data/ Encoded User Data

Some Protocols – MIDI, MPEG

 

LAYER 7 – APPLICATION LAYER

The Application layer is the last layer in the OSI model whose main function is to provide application services for file transfers, e-mail, and other network software services.

Networking Device – gateway

Protocol Data Unit – Data

Some Protocols – DNS, FTP, SMTP, POP3, IMAP, Telnet, HTTP

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May 30, 2018

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