Data Link
The role is to transfer frames to packets
the source Layer 2 address of incoming frames
Primary functions provided by Layer 2 data encapsulation include data link layer addressing, and the detection of errors via cyclic redundancy check calculations. An additional function is delimiting groups of bits into frames.
Layer 2 addressing not required for this topology
Data link layer
The role is to transfer frames to packets
the source Layer 2 address of incoming frames
Layer 4 usually uses segments, layer 3 are packets, layer 2 are frames. Layer 4 uses either tcp (SYN and ACKS) and UDP (connectionless) with port numbers
No. Frames are used on the data-link (layer 2) layer. Packets are used at the Network (layer 3) layer.
Layer 3 i.e, network layer of the OSI model is used to IP addressing.
which layer of the hierarchical three-layer design model combines traffic from multiples IDFs? core layer
layer 3 , network layer .
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??
Data Link Layer
Primary functions provided by Layer 2 data encapsulation include data link layer addressing, and the detection of errors via cyclic redundancy check calculations. An additional function is delimiting groups of bits into frames.
Frames are encapsulating packets. The data link layer makes framing and provide this service to the layer above layer "the network layer".
Layer 3 - network addressing.