Network devices connect electronic devices together to share resources. Common network devices used for local area networks include hubs, switches, and routers. Hubs connect multiple devices and duplicate all data received to send it to all ports. Switches intelligently direct data only to the intended port. Routers forward data packets between different networks and subnets and perform traffic directing functions on the internet.

1. Network Devices
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2. Network Devices
Network devices are components used to connect
computers or other electronic devices together so that
they can share files or resources like printers or fax
machines. Devices used to setup a Local
Area Network (LAN) are the most common type
of network devices used by the public. A LAN
requires a hub, switch, router.
Different Types of Network Devices
Networks Hub, Network Switch, Modem, Network Router,
Bridge, Repeater
INTRODUCTIONINTRODUCTION
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3. Network Hubs
Multiport repeater containing multiple ports to interconnect multiple devices
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4. Network Hubs
Network Hub is a networking device which is used to connect multiple
network hosts. A network hub is also used to do data transfer. The data is
transferred in terms of packets on a computer network. So when a host
sends a data packet to a network hub, the hub copies the data packet to all
of its ports connected to. Like this, all the ports know about the data and
the port for whom the packet is intended, claims the packet.
Passive hubs
◦Only repeats signal
Intelligent hubs
◦Possesses processing capabilities
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5. Repeater
Connectivity devices that regenerate and amplify an analog or digital signal
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6. Repeater
A repeater is an electronic device that amplifies the signal it receives. In other
terms, you can think of repeater as a device which receives a signal and
retransmits it at a higher level or higher power so that the signal can cover longer
distances. Some types of repeaters broadcast an identical signal, but alter its
method of transmission, for example, on another frequency or baud rate.
Different Types of Repeater
o Telephone repeater
o Optical communications repeater
o Radio repeater
o The practical usage of radio repeaters
o Repeater and radio system interoperability
o Repeater duplex channel and talk around channel
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7. Network Switches
A network switch is a computer
networking device that connects
devices together on a computer
network by using packet switching to
receive, process, and forward data to
the destination device.
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8. Switch based LAN
LAN switching is a form
of packet switching used
in local area
networks (LAN).Switchin
g technologies are crucial
to network design, as they
allow traffic to be sent
only where it is needed in
most cases, using fast,
hardware-based methods.
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9. Bridge
A network bridge is a
computer networking device
that creates a single
aggregate network from
multiple communication
networks or network
segments. This function is
called network bridging.
Like a repeater, a bridge has
a single input and single
output port Unlike a
repeater, it can interpret the
data it retransmits.
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10. Bridges
A simple bridge connects two
network segments, typically by
operating transparently and
deciding on a frame-by-frame
basis whether or not to forward
from one network to the other.
A store and forward technique
is typically used so, during
forwarding, the frame integrity
is verified on the source
network and CSMA/CD delays
are accommodated on the
destination network.
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11. Network Router
A router is a networking
device that forwards data
packets between computer
networks. Routers perform
the traffic directing
functions on the Internet.
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12. Router
A router may have interfaces for different types physical layer connections, such as copper
cables, fiber optic, or wireless transmission. Its can also support different network
layer transmission standards. Each network interface is used to enable data packets to be
forwarded from one transmission system to another. Routers may also be used to connect
two or more logical groups of computer devices known as subnets, each with a
different network prefix.
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13. Gateways
A gateway is a node (router) in a computer network, a key stopping point for data
on its way to or from other networks. Thanks to gateways, we are able to
communicate and send data back and forth. The Internet wouldn't be any use to us
without gateways(as well as a lot of other hardware and software).
Popular types of gateways include :-
• E-mail gateways
• IBM host gateways
• Internet gateways
• LAN gateways
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14. Basic Network Devices
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