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Finding Delays Packet Switching

   

Added on  2020-10-12

6 Pages1032 Words139 Views
Assignment 3 Student: Group: Part 1. Finding delays Packet switchingis a method of transferring the data to a network in form of packets. In order to transfer the file fast and efficient manner over the network and minimize the transmission latency, the data is broken into small pieces of variable length, called Packet. As a packet travels from one node (host or router) to the subsequent node (host or router) along this path, the packet suffers from several types of delays at each node along the path. The most important of these delays are the nodal processing delay (dproc), queuing delay (dqueue), transmission delay (dtrans), and propagation delay (dprop); together, these delays accumulate to give a total nodal delay (dnodal). The performance of many Internet applications—such as search, Web browsing, email, maps, instant messaging, and voice-over-IP—are greatly affected by network delays. dnodal= dproc + dqueue + dtrans + dprop Processing Delay Processing delay is the time it takes routers to process the packet header. Processing of packets helps in detecting bit-level errors that occur during transmission of a packet to the destination. 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.

Transmission Delay:Time taken to put a packet onto link. In other words, it is simply time required to put data bits on the wire/communication medium. It depends on length of packet and bandwidth of network. dtrans = Data size / bandwidth = (L/B) second Propagation delay:Time taken by the first bit to travel from sender to receiver end of the link. In other words, it is simply the time required for bits to reach the destination from the start point. Factors on which Propagation delay depends are Distance and propagation speed. dprop = distance/transmission speed = d/s Queuing Delay:Queuing delay is the time a job waits in a queue until it can be executed. It depends on congestion. It is the time difference between when the packet arrived Destination and when the packet data was processed or executed. It may be caused by mainly three reasons i.e. originating switches, intermediate switches or call receiver servicing switches. dqueue= (N-1)L/(2*R) where N = no. of packets L=size of packet R=bandwidth dnodal= dproc + dqueue + dtrans + dprop Task1. Find delay in network You can use command in the terminal: ping “domain name”to check connection 1.Find pingbetween your Computer and astanait.edu.kz (provide screenshot) 2.What is IP of astanait.edu.kz ? 3.Assuming this pingis equal to dnodal, find dqueue(provide calculations)You can assume that distance d is 3000km, bandwidth B is 100Kbps, transmission speed s is speed of light, and processing delay is negligible.

4.Find ping between your Computer and huawei.com (provide sceenshot) 5.Why ping is different for astanait.edu.kz and huawei.com ?

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