Assignment Name: Alternating Bit Protocol (ABP)

The Alternating Bit Protocol (ABP) is a connection-less protocol for transferring messages in

one direction between a pair of protocol entities. It is a simple form of the Sliding Window

Protocol with a window size of 1. The message sequence number alternates between 0 and 1.

The JASPER applet supports the simulation of ABP with 3 modes of simulating messages


Below are some experiments you will conduct to understand ABP and its commands. The first

three experiments will give you a feel for using the simulator and relate to real-world scenarios.

Subsequent experiments will be more complex, yet still relating to real events.

Launching the ABP Protocol Simulator

? Ensure that your default browser supports Java applets. Note that you may need to run

Java in low security for the Java applets in this exercise to work properly.

? For access to all simulations, click on the rotating globe at this book’s Companion Web

site at

? Then click on the link to the Alternating Bit Protocol Simulator.

? This will launch the ABP Simulator applet along with a description of the main

commands we will be using for our experiments.

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