How Broadcast And Collision Domains Are Affected By Each Topology

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Request for Question Clarification by dogbite-ga on 19 Apr 2003 08:22 PDT

Hello kpss-ga,

  What topologies are you speaking of?

Thank you,
dogbite-ga

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Clarification of Question by kpss-ga on 19 Apr 2003 12:11 PDT

topologies are star, ring, bus, mesh and fully connected

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Clarification of Question by kpss-ga on 19 Apr 2003 12:12 PDT

topologies are star, ring, bus, and mesh

Hello kpss-ga,

  I'm assuming that your question is equivalent
  to "What are the characteristics of the star,
  ring, bus, and mesh network topologies for
  broadcast transmissions and communication
  collisions."

  We define the topologies as:

    - star: one node, in the center,  is connected
            to every other node.  the non-center
            nodes are only connected to the center
            node.

    - ring: each node is connected to exactly two
            nodes.

    - bus:  all nodes share one communication medium.

    - mesh: a network topology in which there are at
            least two nodes with two or more paths
            between them.

  These definitions agree with the ones written here:

http://www.its.bldrdoc.gov/fs-1037/dir-024/_3535.htm

  Each topology has the following characteristics
  for broadcast transmissions:

    - star: excellent for broadcast.  a message from
            a center node reaches all other nodes in
            one hop, and a non-center node reaches
            all other non-center nodes in two hops.

    - ring: for a ring with 'n' nodes, it takes O(n)
            hops for a broadcast message to reach
            all nodes.  Also, the broadcast message
            does not reach every node at the same time.

    - bus:  is broadcast by definition.

    - mesh: improves, as with the root (square-root,
            cube-root, etc), as the number of paths
            between nodes increases.  a ring is an
            instance of mesh.  a fully connected graph
            is also a mesh where broadcast is trivial.

  For collisions, the characteristics are:

    - star: the center node is a bottle-neck.  any
            non-center node must secure time with the
            center node before sending a message.

    - ring: to avoid collisions, two nodes must secure
            transmission time with every node along
            the path between them.  without this,
            collisions could be quite high.

    - bus:  each node has to secure the single
            transmission medium.  the risk for
            collisions is the highest.

    - mesh: the probability of collisions decreases
            as the number of paths between nodes
            increases.  again, ring is one extreme
            and a fully connected network is the other.
            a fully connected network has no collisions.

  I hope that answers your question.

  dogbite-ga

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Clarification of Answer by dogbite-ga on 20 Apr 2003 15:56 PDT

Hello kpss-ga,

  I'm very sorry that I answered so unsatisfactorily.  
  I want to get this right.

  I interpreted "domain" as "a field" of problems.

  Can you please elaborate on your question?  What do
  you mean by a "collision domain?"  To me, domain is
  used in the networking sense is "all resources under 
  the control of a single computer system."

      dogbite-ga

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Request for Answer Clarification by kpss-ga on 21 Apr 2003 03:57 PDT

how this three models will be Affected By Each Topology 

Single Domain Model
Single Master Domain Model
Multiple Master Domain Model

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Clarification of Answer by dogbite-ga on 21 Apr 2003 08:13 PDT

Hello kpss-ga,

  The three models are:

    - Single Domain Model -- userids, etc all exist 
      under one domain.  that means they are all managed
      by one master server on the network.

    - Single Master Domain Model -- a single machine
      manages the trusted information, and other machines
      manage information for simple domains.

    - Multiple Master Domain Model -- several master domains
      communicate with each other.

  These are consistent with:

http://www.networkcomputing.com/netdesign/ntb.html

  The star and bus topologies both require sharing a resource.
  This matches sharing a master under all three models.  Both
  the master domain model and the single master domain model
  fit with this when the shared resource maps to the master.
  So the master must be the center node in the star.  For multilple
  master domains, one master will have to be a non-center node.
  This will degrade performance.

  The ring and mesh topologies do not work well with any of
  the domains.  This is because the domains force central points
  of communication at the master, which does not correspond with
  the topology.

dogbite-ga

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Request for Answer Clarification by kpss-ga on 21 Apr 2003 09:11 PDT

thank you very much

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Clarification of Answer by dogbite-ga on 21 Apr 2003 10:27 PDT

Excellent -- I'm glad that helped.

Has your satisfaction (star rating) increased?  :-)

   dogbite-ga

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Request for Answer Clarification by kpss-ga on 23 Apr 2003 02:49 PDT

how can i increase star rating? (i mean my satisfaction)

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Clarification of Answer by dogbite-ga on 23 Apr 2003 07:11 PDT

I looked at the FAQ, and I don't
  think it is possible.  Oh well --
  next time!

        dogbite-ga

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Request for Answer Clarification by kpss-ga on 24 Apr 2003 13:29 PDT

sorry about that, thanks for help

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Clarification of Answer by dogbite-ga on 24 Apr 2003 13:42 PDT

No problem at all kpss.
  I'm glad that I could help.

       dogbite-ga

characteristics i know but "im looking for how DOMAINS are affected by each topology