STRUCTURE OF NETWORK:OSI MODEL

STRUCTURE OF NETWORK:OSI MODEL

sruneerda mantha sruneerda mantha

sruneerda mantha

Aspiring Cloud Engineer.

发布日期: 2024年2月22日
+ 关注

  • OSI stands for open system interconnection.

OSI model consists of 7 layers.

1) Application Layer

2) Presentation Layer

3) Session Layer

4) Transport Layer

领英推荐

5) Network Layer

6) Data Link Layer

7) Physical Layer

  • Here's a brief overview of each layer and its functions
  • 1)APPLICATION LAYER
  • Application layer is implemented in software. Here the user interacts with the applications and send data in the form of messages , files etc.
  • It supports communication and data exchange between applications running on different devices.
  • Examples of protocols operating at this layer include HTTP, FTP, SMTP, DHCP, DNS, Telnet etc.
  • 2)PRESENTATION LAYER
  • Presentation layer receives the data from application layer , here the data in the application layer will be in the form of characters , so presentation layer converts the data into machine representable binary format.
  • Before the data is transmitted to another layer it undergoes encoding , encryption and decryption.
  • Data in presentation layer is compressed , it can be lossy or lossless.
  • 3)SESSION LAYER
  • Session layer protocol helps in setting up and managing the connections .
  • Before a session is established it does authentication and then authorization takes place.
  • 4)TRANSPORT LAYER
  • Data from transport layer is transported to session layer.
  • Data received from session layer is divide into small parts called segments.
  • Every segment contains source and destination port numbers along with a sequence number
  • port number is used to identify the application where as sequence number helps to reassemble the segments in correct order.
  • It also provides error-checking mechanisms and flow control to ensure data integrity and proper pacing of data transmission.
  • Examples of protocols operating at this layer include TCP , UDP
  • 5)NETWORK LAYER
  • This layer is responsible for routing packets across multiple networks.
  • It determines the best path for data to travel from the source to the destination.
  • It also handles logical addressing
  • Network layer assigns the senders and receivers IP address to every segment and forms an IP packet , so that every data packet can reach to the destination.
  • Examples of protocols operating at this layer include IP,ICMP,ARP.
  • 6)DATA LINK LAYER
  • Data link layer receives data packet from network layer and this data packet contains IP address of both sender and receiver.
  • MAC address of sender and receiver are assigned to data packet to form frames.
  • Function of data link layer is physical addressing.
  • 7)PHYSICAL LAYER
  • This layer deals with the physical connection between devices. It defines the electrical, mechanical, and procedural characteristics of the physical medium.
  • It transmits raw data bits over a physical medium.
  • Examples of protocols operating at this layer include ETHERNET .


要查看或添加评论，请登录

sruneerda mantha的更多文章

社区洞察

其他会员也浏览了