Chapter 7: Estimating Ethernet Network Performance

 

7.1	LAN Throughput Practical Exercise: Assume you are considering interconnecting 10-Mbps and 100-Mbps Ethernet networks that are currently isolated networks. Let us assume from monitoring each network you noted that LAN A, which operates at 10 Mbps, has an average frame length of 640 bytes while LAN B, which operates at 100 Mbps, has an average frame length of 516 bytes. Further assume than an average of four network users are on LAN A and three network users are on LAN B. What is the expected throughput (in frames per second) between networks? Note that you can use the LAN throughput predictor model or apply pen to paper to solve this problem.
7.2	In reviewing the specifications for shared media Gigabit Ethernet, you noted that the minimum frame length is 520 bytes on a LAN. Determine the frame rate for Gigabit Ethernet at 100 percent load for: Minimum-length frames Maximum-length frames Compare Fast Ethernet's frame rate to shared Gigabit. Do so for both the frame rate and information transfer capacity.