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Q: data comm (what role does hub play in a network and in client -server program) ( Answered 5 out of 5 stars,   0 Comments )
Question  
Subject: data comm (what role does hub play in a network and in client -server program)
Category: Computers > Hardware
Asked by: nanosumaila-ga
List Price: $6.00
Posted: 28 Aug 2003 04:14 PDT
Expires: 27 Sep 2003 04:14 PDT
Question ID: 249579
what role does a hub play in a network and in client-server program
Answer  
Subject: Re: data comm (what role does hub play in a network and in client -server program)
Answered By: reeteshv-ga on 28 Aug 2003 04:55 PDT
Rated:5 out of 5 stars
 
Dear nanosumaila-ga,

Good day!

Hubs in Networks
----------------
A hub (also known as a concentrator) is a multi-slot device that
provides a central connection point for cables from workstations,
servers, and peripherals. It is thus a place of convergence where data
arrives from one or more directions and is forwarded out in one or
more other directions.

Hubs come in two varieties:
- Passive hubs allow the signal to pass from one computer to another
without any change.
- Active hubs, on the other hand, electrically amplify the signal as
it moves from one device to another in a manner similar to that of
repeaters.

Hubs may also possess self-learning and filtering capabilities that
are usually found in bridges. A hub may also be stacked one on top of
another - such a hub is called a stackable hub.

Hubs in Client/Server Programs (or Architectures)
-------------------------------------------------
In describing network topologies, a hub (or star) star topology is one
in which all the nodes are directly connected to the hub by
twisted-pair wires. In this model, a hub acts as a server and stations
attached to it as its clients. A client has to be aware of the
whereabouts of the server in any client-server model (a common
approach is to have the server use a well-known port). Thus, in order
to allow a node to attach itself to the hub, the hub (like any server)
first creates a socket, binds its address and waits for connection
requests from clients.

Selection Criteria
------------------
Hubs are used to extend the reach of your network. They should satisfy
the following evaluation criteria:
Multiple topology/media support – a hub should be able to support
mix-and-match of various LAN technologies, e.g., Ethernet, ATM, etc.
Fault tolerance – the system and the productivity of the network
should not be negatively affected if any hub component fails
Slot independence – the hub should not impose any limitations as far
as installation of a module in a slot is concerned, i.e., we should be
able to install any module in any slot
High-speed backplanes – their capacity determine the overall capacity
of the hub as they can carry a large amount of data, address, etc.
Routing and bridging – the ability to integrate bridging and routing
plays an important role in smaller networks, as it eliminates a need
for external components
Latency – by latency, we mean the time taken by a hub to forward a
data packet that it has received. Common sense suggests that a lower
latency rate will lead to a faster performance
Management – these advanced management facilities (generally found in
modular hubs) allow the networks to managed with more control and
greater flexibility. The features to be compared include utilities,
monitoring functionality, and training costs
Scalability – it refers to the capability to expand a network with
minimal changes. We should be able to integrate products from previous
with new model lines; it should also be easy for us to migrate to new
platforms with minimal disruption to existing operations.

I hope the above information satisfactorily answers your question :)

Thanks & regards,
reeteshv-ga
nanosumaila-ga rated this answer:5 out of 5 stars
The answer given is very satisfying and the response time too is good

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