1. COMNET III Tutorial
By
Dr. Mohammed Hussein Al-Hubaishi
mohammedhbi@gmail.com
Faculty of Science and Technology
Yemen-Thamar University
- By Mohammed Hussein Thamar University 1
2. COMNET III
The COMNET III is an application that was written in
the programming language MODSIM II using an
object-oriented design.
COMNET III uses a discrete event simulation
methodology when running the simulation of a network
model.
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3. Selection Tool
Connection Tool
Router
Access Point
Cloud
Point-to-Point
Call Source
Application Source
Background Map
Message Source
Background Shape
CSMA/CD
Passing Node
Zoom In
Connection Tool
ATM Switch
Subnet
Transit Net
Source Socket
Background Map
Token Passing
Computer Group
Cloud VC
Response Source
Session Source
Remote
COMNET III
Tool
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6. Nodes in COMNETIII
• Node represents a single network node (i.e.
workstation) in the model.
• Nodes can even have processing capabilities,
memory and hard disc storage assigned to
them.
• Nodes in this model are only sending,
forwarding, and replying to messages.
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7. Network Links in COMNETIII
• Icon represent links in the networks.
• The properties of this link let you select the
type of the network among several standards,
such as Ethernet or wireless link, etc.
• One or several message-sources are attached to
a node and thereby define the set of messages
a node sends, replies to, or forwards.
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10. Messages in COMNET III
• If a node should also respond to a message
sent to it, should be scheduled by set to
Received message. That enables the Edit
button next to it, which allows the selection of
messages.
• Usually there is a single destination of the
message entered in the Edit Destination List
dialog, but multiple destinations and ways to
choose one of them can be specified .
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12. Node Sends a Message
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13. Node Receives Or Responses a Message
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14. Messages Reports in COMNET
• Various reports can be requested via the
statistics button; such as the Contention
Channel Utilization, Delay, etc.
• For example to measure the delay of a
particular message, a report of this statistics
can be requested and after execution the report
can be viewed via the statistics dialog.
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