Question

mclemore1

During the encapsulation process, in which order are the IP address, MAC address, and Port number assigned when a router is establishing communication with a TFTP server?

Netstudent

the order goes by the layer of OSI that encapsuation is taking place. initiation starts at layer 7 and goes down the stack. then on the recieving end it is decapsulated in reverse order. I guess I'll elaborate.

The tftp data is sent to the transport layer where it is segmented into bytes. At this layer a UDP header with source/destination ports, length, and checksum are prepended to the data payload of each segment.

Then this is handed to layer 3 where the IP header is prepended to the segment. It is now a datagram with source and destination IP.

This is then handed to layer 2 where the datagram is framed with source and destination MAC and trailed with a FCS.

This is a very oversimplified explanation but you get the point.

mclemore1

Thanks