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Packet-Switching Node Architectures
Exchange Discount Summary Exchange Discount -Rs. Final Price Rs. Apply Exchange. Processing delays in high-speed routers are typically on the order of microseconds or less. In simple words, it is just the time taken to process packets. Find total time required for 10 packets to reach A from B. Explanation : No. When the 1st packet reaches R2, the second packet reaches R1.
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Reference: Wikipedia, RFC. This article is contributed by Abhishek Agrawal and Shaurya Uppal. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.
High-performance Packet Switching Architectures | Itamar Elhanany | Springer
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. Advantage of Packet Switching over Circuit Switching : More efficient in terms of bandwidth, since the concept of reserving circuit is not there. Minimal transmission latency. More reliable as destination can detect the missing packet.
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More fault tolerant because packets may follow different path in case any link is down, Unlike Circuit Switching. Cost effective and comparatively cheaper to implement. Since the packets are unordered, we need to provide sequence numbers to each packet.
Complexity is more at each node because of the facility to follow multiple path. Transmission delay is more because of rerouting. Packet Switching is beneficial only for small messages, but for bursty data large messages Circuit Switching is better. Modes of Packet Switching : Connection-oriented Packet Switching Virtual Circuit :- Before starting the transmission, it establishes a logical path or virtual connection using signalling protocol, between sender and receiver and all packets belongs to this flow will follow this predefined route.
Data is divided into small units and all these small units are appended with help of sequence number. Overall, three phases takes place here- Setup, data transfer and tear down phase. All address information is only transferred during setup phase. Once the route to destination is discovered, entry is added to switching table of each intermediate node. During data transfer, packet header local header may contain information such as length, timestamp, sequence number etc. Connection-oriented switching is very useful in switched WAN. Some popular protocols which use Virtual Circuit Switching approach are X.