This is for my Technologies Infrastructure and Architecture class. Consider an a
ID: 3890690 • Letter: T
Question
This is for my Technologies Infrastructure and Architecture class.
Consider an application that transmits data at a steady rate (for example, the sender generates an N-bit unit of data every k unites of time, where k is sand fixed). Also, when such an application starts, it will continue running for a relatively long period of time. Answer the following questions, briefly justifying your answer: a) Would a packet-switched network or a circuit-switched network be more appropriate for this application? Why? b) Suppose a packet-switched network is used and the only traffic in this network comes from applications like that describe above. Furthermore, assume that sum of the application data rates is less than the capacities of each and every link. Is some form of congestion control needed? Why? What advantages does packet switching have over circuit switching?Explanation / Answer
Answer 4
1) In circuit-switching, electronic signals pass through several switches before a connection is established and no other network traffic can use those switches during a call. In packets based switching, the message gets broken into small data packets that seek out the most efficient route. Each packet can take different route and its header address tell the destination and reassembling sequence of packets.
2) Pckets switching is more efficient in case of line efficiency,because node to node link can be dynamically shared by many packets over the same time.
3)Data rate conversion can be perform by packetes switching because each station connect to its node with its proper data rate.
4) In circuit switching calls are blocked when traffic become heavy, means network stop accepting new connection request until traffic become low on network, but packets switching still accepte the connection request, but increases the delivery delay.
5)In packet switching priorities can be used for transmission of packets when packets are in queue.
Answer 3(a)
A circuit-switched network would be more appropriate for this application, because the application involves long sessions with predictable smooth bandwidth requirements. Since the transmission rate is known and not busy, bandwidth can be reserved for each application session without significant waste. In addition, the overhead costs of setting up and tearing down connections are amortized over the lengthy duration of a typical application session.
Answer 3(b)
All the applications simultaneously transmit over one or more network links in the worst case scenario, but each link has sufficient bandwidth to handle the sum of all of the applications data rates, so very little queue or no congestion will occur.
The network does not need congestion control mechanisms with such generous link capacities.
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