A 1-km-long, 10-Mbps CSMA/CD LAN (i.e., Classic Ethernet)has a propagation speed of 200 m/μsec (i.e., how fast the radio signal moves on the link). Thereare no repeaters in this system. Data frames are 512 bits long, including 480 bits of payload (i.e.,effective data) and 32 bits of overhead (e.g., header, checksum, and other overhead fields). Everydata frame should be confirmed by a 64-bit ACK frame. We assume the sender needs to use onecontention slot to seize the channel before transmitting the data frame, and the receiver needsto use one contention slot to seize the channel before transmitting the ACK frame. Answer thefollowing questions: a. What is the minimum length of a contention slot in μsec? b. What is the effective data rate for the sender to send one data frame? Assume that there areno collisions. Show the calculation c. What would be the impact on the total delay and the effective data rate if we used a longerdata payload size in the data frame? Given one application scenario where such change isuseful.

A 1-km-long, 10-Mbps CSMA/CD LAN (i.e., Classic Ethernet)has a propagation speed of 200 m/μsec (i.e., how fast the radio signal moves on the link). Thereare no repeaters in this system. Data frames are 512 bits long, including 480 bits of payload (i.e.,effective data) and 32 bits of overhead (e.g., header, checksum, and other overhead fields). Everydata frame should be confirmed by a 64-bit ACK frame. We assume the sender needs to use onecontention slot to seize the channel before transmitting the data frame, and the receiver needsto use one contention slot to seize the channel before transmitting the ACK frame. Answer thefollowing questions: a. What is the minimum length of a contention slot in μsec? b. What is the effective data rate for the sender to send one data frame? Assume that there areno collisions. Show the calculation c. What would be the impact on the total delay and the effective data rate if we used a longerdata payload size in the data frame? Given one application scenario where such change isuseful.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter9: Computer Networks

Section: Chapter Questions

Problem 3VE

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