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Physical
Network Infrastructure |
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A network
consists of two or more computers that are linked in order to share
resources (such as printers and CDs), exchange files, or allow
electronic communications. The
computers on a network may be linked through cables, telephone lines,
radio waves, satellites, or infrared light beams.
Two very
common types of networks include:Local Area Network (LAN) Wide Area
Network (WAN)
You may also
see references to a Metropolitan Area Networks (MAN), a Wireless LAN
(WLAN), or a Wireless WAN (WWAN).
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Local Area
Network (LAN) |
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A Local Area Network (LAN) is a network that is confined to a
relatively small area. It
is generally limited to a geographic area such as a writing lab,
school, or building.
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Wide Area
Network (WAN) |
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Wide Area Networks (WANs) connect networks in larger geographic
areas, such as Florida, the United States, or the world. Dedicated
transoceanic cabling or satellite uplinks may be used to connect
this type of global network. |
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Metropolitan
Area Network (MAN) |
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A metropolitan area network (MAN) is a network that interconnects
users with computer resources in a geographic area or region larger
than that covered by even a large local area network ( LAN )
but smaller than the area covered by a wide
area network (WAN) . The
term is applied to the interconnection of networks in a city into a
single larger network (which may then also offer efficient
connection to a wide area network). It
is also used to mean the interconnection of several local area
networks by bridging them with backbone lines. The
latter usage is also sometimes referred to as a campus network. |
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Wireless
Fidelity (Wi-Fi) |
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Definition - What does Wireless
Fidelity (Wi-Fi) mean?
Wi-Fi is a type of wireless network technology used for connecting
to the Internet. The
frequencies wi-fi works at are 2.4Ghz or 5Ghz, ensure no
interference with cellphones, broadcast radio, TV antenna and two-way
radios are encountered during transmission.
To simplify, Wi-Fi is basically just radio waves broadcast from a Wi-Fi
router, a device detecting and deciphering the waves, and then
sending back data to the router. It
works very similarly to an AM/ FM radio but it is two-way
communication channel. Wi-Fi
works over longer distances than bluetooth or infrared and is also a
low power unobtrusive technology, making it suitable for portable
devices such as laptops and palmtops. Wi-Fi
is governed by the Wi-Fi Alliance, an association of manufacturers
and regulators defining standards and certifying products as Wi-Fi
compatible.
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Network
Security Solutions |
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Nowadays, the information theft applications are
increasingly challenging many corporations. Taking precautions by
means of the end-to-end security solutions is an inevitable
necessity while the security goes beyond a network-based concept.
Herein, not only the products such as Firewall and IPS which enables
only network-based security but Web Security, End-User Security,
Network Access Control, and Data Loss Prevention (DLP) solutions
should also be considered as indispensable parts of the whole
security concept. |
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