Here is a diagram, since a picture is worth a thousand words:. Python Javascript Linux Cheat sheet Contact. However Datagram can also be used in a more general sense and refer to other layers link : Datagram A self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer andthe transporting network.
Tags: Networking Network Programming. Related How to check for the existence of deep subdomains even if the intermediate ones don't exist? Difference between network card size and capacity Upgraded to Debian 9. How do they monitor that? Pandas how to find column contains a certain value Recommended way to install multiple Python versions on Ubuntu Packet is encapsulated within a frame.
A Frame can be defined as a data unit used in Data Link layer. A frame is consist of markers which depicts the start and end of the packet and addresses for sending and receiving. A particular example of a frame is the Ethernet frame. The following points give you a brief about the various fields of a frame.
A packet can be any small block of data sent across a packet switched network. The term derives from character-oriented protocols that are added special start-of- frame and end-of-frame characters when transmitting packets. A packet is the protocol data unit used in the network layer. As the primary function of the Network layer is to deliver a packet from one logical address IP address to another. A packet is a solitary unit of data interchanged between two devices on a network.
The router uses IP packet header to send packets through the network from source to destination. When dealing with connectionless network, data is partitioned into small parts known as packets to transfer it over a network that are multiplexed into high range intermachine connections. Yug Singh 2, 3 3 gold badges 20 20 silver badges 43 43 bronze badges. Add a comment. Active Oldest Votes. However Datagram can also be used in a more general sense and refer to other layers link : Datagram A self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer andthe transporting network.
Improve this answer. Community Bot 1 1 1 silver badge. Malt Malt This kind of implies that the entire datagram must fit in a single frame.
DavidSchwartz I know this is three years later, but I just saw this. A datagram is simply a construct of a protocol header, and included bits. A Frame is a datagram at L2. A Packet is a datagram at L3. Packets get carried within a Frame, so the Packet datagram does indeed fit inside a Frame datagram. More details on this answer at Network Engineering Stack Exchange.
The same datagram can be sent more than once in different frames, a frame only exists on a single link. DavidSchwartz Right. I think we're on the same page. Inside the first frame is the first third of the UDP Segment. Inside the second frame is the second third of the UDP segment etc. All four instances above are datagrams -- one Segment, and three Frames. Segments are units of TCP, which segments a data stream. UDP does not segment the data as it is a message-based protocol vs.
TCP, which is a stream-based protocol. Show 2 more comments. David Schwartz David Schwartz k 17 17 gold badges silver badges bronze badges. Do you mean that considering length Packet length means L4 or above layers and frame length means whole packet with Ethernet, ip and above layers. There is no rule that requires the entire packet to fit in a single frame. Except in specific protocols like Ethernet.
But this is not the case for ATM where a single packet may be split over multiple frames.
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