CSCI 434 please try do all question thank you

Problem 4. Packet-switching: store-and-forward (10 pt.) Assumptions: Assume no other delay source than transmission delay Packet length (L) = 6 MB Link bandwidth (R) = 1 Gbps Note that 'B' stands for bytes and 'b' does for bits in the metrics above a. Calculate the end-to-end delay, assuming that source and destination directly connected thru a single link without any intermediate network device in between (i.e., Source ---- Destination) b. Calculate the end-to-end delay, assuming that source and destination connected thru three intermediate links with two intermediate network devices in between (i.e., Source ---- Network Device1 ---- Network Device2 ---- Destination)