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Figure 42.2: Architectural Realization of a Session Level Simulation Sessionforwarded to the loss modules drop target. If not, the loss module forwards it to its target which must be a delay module. Thedelay module will forward the packet with a delay to its target which must be a receiver application.42.4 Commands at a glanceFollowing is a list of session-level related commands:set ns [new SessionSim]This command creates an instance of the sessionmode simulator.$ns_ create-session This command creates and attaches a session-helper, which is basically a replicator, for the source created at the.377