1. Packet delay and transmission time. a. How long (in seconds) would it take to deliver a 22 TB file ( 221012 bytes) across a 1Gb/sec(b= bits) dedicated link? b. Now assume the 1Gb/sec dedicated link is reduced to a 0.6Gb/s link, but 65% of the data from part a of this problem are cached locally. How long would this take to be delivered (from both cache and from the network)? c. Suppose 4 packets arrive simultaneously to a link which no packets are currently being transmitted or queued. Each packet is of length 1500 bits and the link has a transmission rate of 1Mbps. What is the average queuing delay ( dqueue )? d. What is the total transmission time for the 4 packets