Telegrams are sent in data packets. Bits packet frame segment data mean data packet and they belongs to Data link layer.
Bye.
Data, Segment, packet, frame, bit in that order
Packet
The Network layer (Layer 3, typically IP) will receive a segment from the Transport layer (Layer 4, typically TCP or UDP), and will add its own header to it to create a packet. The size of the packet will thus always be the size of the segment plus the Network layer header, the same as when the next layer down (the Data Link layer, layer 2, typically Ethernet) encapsulates the packet into a frame for transmission.
Theoretically Data Link Layer puts packet into frame by adding header and tail to the packet but how is it possible when you take into consideration CCSDS packet definition:"A packet is a block of data with length that can vary between successive packets, ranging from 7 to 65,542 bytes, including the packet header.Packetized data are transmitted via frames, which are fixed-length data blocks. The size of a frame, including frame header and control information, can range up to 2048 bytes."According to this, frame is smaller than packet, so how can you put packet into frame??
b. 2
Packet
yes,data link layer finalize and frame a packet as frame is a series of bits that units a data.........
The FCS (Frame Check Sequence) Component of an ethernet frame permits the end recipient to check for, and correct, errors in the packet. It is a checksum that is checked against the packet for data integrity, to put it simply. When the number does not check out properly, the frame is thrown out and a replacement packet is requested.
Frames encapsulate packets. When a packet arrives at the data link layer, the entire thing, header, data, and all, is used as the data field of a frame. The entire packet is put in an envelope (the frame) so to speak (assuming it fits). Citiation: "Computer Networks". By Andrew S. Tanenbaum
Frames are encapsulating packets. The data link layer makes framing and provide this service to the layer above layer "the network layer".
Frame relay.
In networking, PDU means "protocol data unit", and it is the generic name of the "packets" of data used at different levels of the network. Using the numbering of the OSI layers: At layer 2, the PDUs are called "frame". Example: An Ethernet frame, a frame-relay frame. At layer 3, the PDUs are called "packets". Example: An IP packet. At layer 4, the PDUs are called "segments". Example: A TCP segment, a UDP segment.