Network Devices
hubs : A hub
serves as a central point to which all of the hosts in a network connect to .
It receives a signal from one port and sends it out to all other ports.
Sometimes it is
called a multiport repeater .
2-
Switches
: Like hubs, a switch is used to connect multiple hosts together, but it has
many advantages over a hub. Switch is an OSI Layer 2 device, which means that
it can inspect received traffic and make forwarding decisions. Each port on a
switch is a separate collision domain and can run in a full duplex mode .
3-
Router : is a device that routes packets from one
network to another. A router is most commonly an OSI Layer 3 device. Routers
divide broadcast domains and have traffic filtering capabilities
4-
Bridge : A device that
connects two local-area networks (LANs), or two
segments of the same LAN that use the same protocol, such as Ethernet or Token-Ring..
5-
. A firewall is a system designed to prevent unauthorized access to or
from a private network. Firewalls can be implemented in bothhardware and software, or a combination of both. Firewalls are frequently used to
prevent unauthorized Internet users
from accessing private networks connected to the Internet, especiallyintranets. All messages entering or leaving the intranet pass through
the firewall, which examines each message and blocks those that do not meet the
specified security criteria
.
6-
Access Point : hardware device or a
computer's softwarethat acts as a communication hub for users of a wireless
device to connect to a wired LAN. APs are important for providing heightened
wireless security and for extending the physical range of service a wireless
user has access to.
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