I received the following E-Mail from Eng. Amr YOUSSEF

Please Doctor , I have a question : 
In Sheet (2) , problem (5) , Part b) , sub-part  iv) :
When end devices  B& D are connected via  100 Mbps link (Full Duplex ) >>> They can talk to each other by this Rate (100 Mbps) .
and other end devices may talk to each other simultaneously  with any combinations  resulting in  ; Rate   : 10 +10 =20 Mbps , hence ,
Maximum Throughput = 2 * (100 + 20 ) = 240 Mbps . 

However , In solution attached on Moodle  :   Maximum Throughput = 2 * 30 = 60 Mbps .

Am I misunderstanding ?  or true ?

Thanks in-advance .

I checked this part on the posted "Sheet_2 Solution Summary", and the remarks above are correct. A new version of the file is being posted.

Dr. Mahmoud EL-HADIDI