1. Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rates R1 = 400 kbps, R2 = 3 Mbps, and R3 = 1 Mbps. Assuming no other traffic in the network, what is the average throughput (in bytes/second) for the file transfer?

	a.	1 Mbps
	b.	it cannot be determined
	c.	400 KiB/s
	d.	48.8 kB/s
	e.	approximately 48.8 KiB/s
	f.	3 Mbps

2. Suppose users share a 5 Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. When circuit switching is used, how many users can be supported?

	a.	1
	b.	2
	c.	25
	d.	5

3. An enterprise based in Puerto Rico needs a block of IP addresses for its operations. Which of the following organizations can the enterprise request the IP address block from?

	a.	IETF
	b.	IANA
	c.	ICANN
	d.	ARIN