In the following network scenario – the client runs two applications FTP and HTTPS with port number 3675 and 1978 respectively. The IP and Mac address for all the network devices are given in the scenario.
The client sends 2 IPv4 data frames, one FTP and one HTTPS, to the corresponding servers. Based on the packet location in the network and direction of the travel (shown using an arrowhead) – answer the following
questions: 1. Construct the complete FTP frame (marked as a green colored box) with all the header content of all the layers except the application layer – you can use the word DATA to represent the actual content of the application payload the FTP packet carries. (8 marks)
Answer :
SRC MAC | DST MAC | SRC IP | DST IP | TCP ( FTP) | DATA
or
Transport Layer = TRANPORT Header SPORT|DPORT|FLAGS|SEQ|ACK|PAYLOAD Netork Layer = PACKET HEADER SIP|DIP| TTL | OTHER | PAYLOAD Data Link Layer = FRAME DMAC|SMAC|LAYER3|PACKET HEADER|TRANSPORT HEADER|
