Advantage and disadvantage between Hub and Switch

 
Figure: Hub

Hub Advantages

• A hub allows you connect clients to share and conversations with a network protocol analyser.
• A hub also can modulate signal of the cable, if needed.
•  Using hub save money because switches are costly then hub.

       
Hub Disadvantages:

• Hub can’t control traffic of data. Cause it receive all attachment post.
•  Hubs have limited port to connect client, so it is not suitable for large network.
•   It works as a query system. When NIC send a work to the hub then hub make this work pending and process one by one. So it’s time consuming.

                 

Figure: Switch

 Switch Advantages

• Client Performance: Because any given system attached to a switch sees only information explicitly addressed to its NIC, there is less overhead time spent throwing away packets that it does not need to read.
• Higher Throughput: Because only relevant traffic is sent down any given network port, each NIC gets its own packets delivered to the switch independently of each other NIC attached to that switch. This means a switch can manage a larger total volume of data in transit at any given time.

Switch Disadvantages:

Switch: Unless the switch is expensive enough to include "port mirroring" capability, a sniffer is of limited use on a switch because the switch automatically filters out the traffic the sniffer would like to get.

Introduction to Networks and Networking Concepts

Networks are vital to the business use of computers, especially for the
applications and data that networks can deliver. If a single computer with
standard desktop software—such as word processing, spreadsheets, and
databases—can make anyone more productive,then interconnecting computers
on a network and bringing people and data together improves communications,
fosters productivity, and creates opportunities for collaborating and
exchanging information quickly and easily.
As a future network administrator, you must understand the fundamental
concepts in creating a network and making any network perform correctly. It’s
also important to understand what’s involved in networked communications
and which network models are best in different business situations. This
knowledge gives you a solid foundation for network design, implementation,
and troubleshooting tasks.


WHAT IS NETWORKING?

Networking involves connecting computers and other electronic devices for the purpose of
sharing information and resources and for communication. Even though the concept of
networking is basic, a great deal of technology is required for one device to connect and
communicate with another, and many choices for physical connections and related software
are possible. In the following sections, you learn about the fundamental concepts that drive
all networks to help you understand why networking is so important in the workplace and
in people’s everyday lives.

Local and Wide Area Networks

Originally, networks used expensive and complex technologies, and many of the earliest
networks were entirely custom-built. These early networks seldom interconnected more
than a dozen computers, nor were they likely to support more than one or two additional
peripheral devices. The earliest networking technologies imposed severe restrictions on the
number of interconnected machines and the physical span of the networks.For example,one
early networking technology could support a maximum of only 30 users on a single
network, with a total span of just 607 feet. This setup works well in a small office
environment with a limited number of connected machines, where the span from one end
of the office to the other—even allowing for characteristic twists and turns—falls within this
limitation.
A small network, limited to a single collection of machines and one or more cables and other
peripheral equipment, can be called a local area network (LAN). LANs also form the
basic building blocks for constructing larger networks called internetworks. An
internetwork is a network of networks or a networked collection of LANs tied together bydevices such as routers (discussed in Chapter 13). For large organizations that occupy more
than one floor in an office building or operate in multiple buildings in a campus setting, for
example, no single LAN can contain all the computers, cables, and other equipment needed
to bring together the entire user community. When the number of computers exceeds 100
and the distance to be spanned is more than 1000 feet, an internetwork is usually needed.
The Internet, the best example of the largest internetwork in the world, is a vast public
wide area internetwork that makes it possible for any computer in the world to communicate
with any other computer in the world using standard technologies and protocols.
Because of their limitations, early LANs were unable to meet the networking requirements
of large organizations, especially those that operated in multiple locations. The benefits of
networking were so great, however, that technology evolved to accommodate larger,
geographically dispersed organizations. As the scope of a network expands to encompass
multiple groups of users in multiple locations, LANs can grow into wide area networks
(WANs). AWAN is an internetwork that spans distances measured in miles and links two
or more separate LANs. WANs use the services of third-party communications providers,
such as telephone companies, to carry network traffic from one location to another.
Occasionally, you might encounter a network type called a metropolitan area network
(MAN). Essentially, MANs use WAN technologies to interconnect LANs in a specific
geographic region, such as a county or a city. It’s not uncommon to find large, complex
networks involving all three network types:LANs for purely local access,MANs for regional
or citywide access, andWANs for access to remote sites elsewhere in the country or around
the world.MANs have recently received a boost in popularity because of the growing trend
in some major cities to implement a citywide wireless network. In these cases, wireless
networking is possible in almost any part of the city, allowing users to stay connected
whether at home, at work, or at play. Some wireless technologies that make this type of
networking possible are discussed in Chapter 3.
Most businesses today use networks to store and share access to all kinds of data and
applications and to provide communications for employees and business partners. For these
reasons, networks are regarded as critical business tools. Nearly all users in today’s workplace
use computers to connect to their company networks.