The term “encapsulation” is used to describe a process of adding headers and trailers around some data. For example, when you send an email using your favourite email program (like Outlook or Gmail) that email is sent from the Application layer to the Transport layer. The Transport layer encapsulates the data and adds its own header (with its own information, such as which port will be used) and passes the data to the Internet layer, which again encapsulates the received data and adds its own header, usually with information about the source and destination IP addresses. The Internet layer than passes the data to the Network Access layer. This layer is the only layer that adds both a header and a trailer. The data is then sent through a physical network link.
Each layer adds its own information:
The term “decapsulation” refers to the process of removing headers and trailers as data passes from lower to upper layers. This process happens on a computer that is receiving data.
Frame, packet, segment
Frame – the term “frame” refers to the encapsulated data defined by the Network Access layer. A frame can have a header and a trailer that encapsulate a data section.
Packet – the term “packet” is used to describe the encapsulated data defined by the Internet layer. A packet can have a header with the source and destination IP addresses.
Segment – the term “segment” describes encapsulated data defined by the Transport layer. A segment can have a header with informations such as source and destionation port numbers, sequence and acknowledgment numbers, etc.
Hello Blogger,
ReplyDeleteCould you simplify these BLOG POST in TAMIL or English in few lines - why these many terms and how to remember these in OSI model or NEW TCP/IP model ?
1. Network layer
2. Transport Layer
3. Internet layer
Help us to define IN simplified Diagram, and Youtube/Bitchute ...videos and more REferences.. to learn more about -these word
1. Encapsulation
2. Encryption
What's the difference ?
Please define all these TERMS in this comment clearly to learn better from this post...
Hi, Vishal as you asked a good question on above that Encapsulation it is the process of taking data from one protocol and translating it into another protocol, so the data can continue across a network. For example, a TCP/IP packet contained within an ATM frame is a form of encapsulation.
ReplyDeleteThat when we say that each layer builds a protocol data unit (PDU). For another example, the term Layer 3 PDU refers to the data encapsulated at the Network layer of the OSI model.
Thank you