Physical Network Infrastructure


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).

   Local Area Network (LAN)

  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.
   Wide Area Network (WAN)


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.

   Metropolitan Area Network (MAN)


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.

   Wireless Fidelity (Wi-Fi)


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.

   Network Security Solutions


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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