Q56

Consider three IP networks $A, B$ and $C$. Host $H_A$ in network $A$ sends messages each containing $180$ bytes of application data to a host $H_C$ in network $C$. The $\text{TCP}$ layer prefixes $20$ byte header to the message. This passes through an intermediate network $B$.The maximum packet size, including $20$ byte IP header, in each network is: A: $\text{1000 bytes}$ B: $\text{100 bytes}$ C: $\text{1000 bytes}$ The network $A$ and $B$ are connected through a $1$ Mbps link, while $B$ and $C$ are connected by a $512$ Kbps link (bps = bits per second).

Assuming that the packets are correctly delivered, how many bytes, including headers, are delivered to the $IP$ layer at the destination for one application message, in the best case? Consider only data packets.