ENVS 1000 Lecture 4: ENVS 1000 Lecture 4 Notes
10 May 2018
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ENVS 1000 Lecture 4 Notes – Receiver Nodes
Introduction
• The nature of the communication channel connecting the sender and receiver nodes is
unspecified for this example
• Although details of the channel must be resolved for the communication to take place,
you can see that the physical connection is independent of the messaging.
• This suggests that a networking model must support at least two independent means of
communication
• A message-sharing onnetion etween orresponding appliations at the sender and
receiver computers, and also a physical connection with signaling that represents the
messages being transported.
• In reality, addressing individual nodes out of the many that are typically available in a
large multi-networked system, communication line sharing, and other issues require a
number of additional layers of communication management that will be presented.
• As we just indicated, these examples do not attempt to present a full picture of the
requirements for effective data communication.
• We chose to omit many important factors in order to clarify the basic communication
process.
• Some of the factors that we must consider include the characteristics of the
communication channels.
• The nature and formats of the interfaces with the sender and receiver end points,
usually referred to as hosts or nodes.
• The nature and contents of the messages.
• The means of transporting messages where the distances between sender and receiver
are large and the routes complex.
• The association of network addresses with their physical location.
• The means of sharing channel resources efficiently.
• Methods for dealing with heavy network traffic and congestion.
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