A) Which layers must have the same protocol at each end of a host-host connection, but are ignored across the Internet?

B) A router (A) receives a 1400-byte datagram which is put into an output buffer for router B which at that time has 8,000 bytes waiting to be sent. The link to router B operates at 100 Mbps over fiber (v=200 m/us), and B is 2000 km away. How long (in sec) does it take before the datagram is fully received by B?

C) Explain TCP flow control and congestion control briefly

D) Describe briefly what disadvantages does TCP have if RTO (Retransmission Time out) is too short

E) What is TCP sender efficiency roughly in % when this happens?

F) Explain two different types of loss detection in TCP briefly.

G) Which one does take less time to detect packet loss?

H) What does the TCP Reno sender do in the event of (b)?