3.1.3 Layering

1. For the following:
   • Bandwidth 2 MBit/s
   • 1000 byte packets, 10 byte ack packet
   • Cable distance 3000 km, propagation speed 2×10⁵km/s
   What size window is required to keep the line fully utilised?
2. For a sequence space of 3 bits, what is the maximum window size? For a sequence space of size N?
3. If the bandwidth of a network is 100 MBit/s and the sequence space is 32 bits, and each byte is labelled, what is the maximum packet lifetime?
4. The memory buffer capacity of a certain bottle-necked router in the Internet is less than one packet per connection traversing it. What effects will this have on TCP?

The answer.