1.What is a thin client? Can you find any web application that would make your c
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Question
1.What is a thin client? Can you find any web application that would make your computer work like a thin client? (Hint: products from Microsoft and Google)
2.Consider sending a packet from a source host to a destination host over a fixed route. List the delay components in the end-to-end delay. Which of these delays are constant and which are variable?
3.Suppose users share a 2Mbps link. Also suppose each user transmits continuously at 1Mbps when transmitting, but each user transmits only 20 percent of the time.
a.When circuit switching is used, how many users can be supported?
b.For the remainder of this problem, suppose packet switching is used. Why will there be essentially no queuing delay before the link if two or fewer users transmit at the same time?Why will there be a queuing delay if three users transmit at the same time?
Explanation / Answer
1. A thin client, sometimes called a lean client, is a low-cost, centrally-managed
computer devoid of CD-ROM players, diskette drives, and expansion slots. The term
derives from the fact that small computers in networks tend to be clients and not
servers. Since the idea is to limit the capabilities of these computers to only
essential applications, they tend to be purchased and remain "thin" in terms of the
client applications they include. As software as a service (SaaS) gains popularity,
it is expected that thin clients and blade PCs will replace desktop PCs in many
work and educational environments. In general, they are not as vulnerable to
malware attacks, have a longer life cycle, use less power and are less expensive
to purchase.
2. Variable delays from end - end: processing delay, Queuing delay
Constant Delays: Propagation delay (medium, length), Transmission delay
3. a)Link size / transmitting size = 2Mbps / 1Mbps = 2 users can be supported
b)Since each user requires 1Mbps when transmitting, if two or fewer users
transmit simultaneously, a maximum of 2Mbps will be required. This does not exceed
the 2Mbps of available bandwidth in the shared link. If there is 3 users then the
3Mbps needed exceeds the 2 Mbps available. So there will be a queueing delay.
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