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What is Network Security?

 What is Network Security?

network security

Network security simply means the action of protecting a network. It is a strategy of an individual or a brand which is designed to prepare a system that secures all the assets inside a network such as a network traffic and the data stored and shared in the network.

The unique strategy of securing a network and all of its assets involves the usage and integration of hardware as well as software components developed in the latest era. A network security strategy, which is designed in an effective way, helps in preventing different threats and cybercriminals from entering inside the network without an authorized access.

Types Of Network

There are three types of Network

  1. LAN (Local Area Network)
  2. MAN (Metropolitan Area Network)
  3. WAN (Wide Area Network)

LAN (Local Area Network)

local area network

  • Stands for Local Area Network
  • The computer is geographically close together that is the same building, room or campus.
  • LAN consists of just two or more computer to exchange data
  • Local area network is privately owned network within a small area usually a single building or campus of up to few kilometers.

Features of LAN (Local Area Network)

  • A LAN offers bandwidth of 10-100 Mbps
  • LAN transmission capacity is usually greater than that of Wide Area Network typically bit rate ranges from 1 Mb/s to 20 Mb/s
  • Distance ranges from 10-1km
  • High data transmission rate as compared WAN and MAN.
  • The diameter is not more than a few kilometers.
  • It reduces the hardware and software cost because a user can share several computers peripheral devices such as HDD, modem and LAN platform software.
  • It is controlled by a single organization.

MAN (Metropolitan Area Network)

Metropolitan Area Network

MAN is the network that is larger than a LAN

  • A metropolitan network is a network of computers which are spread over a metropolitan area such as within a city. It connects two or more LAN together. A single organization to share data and resource may operate MAN.
  • The distance is not more than 10km
  • ISP (Internet Service Provider) providing network communication within a city and the network of different branches of bank within the same city are the examples of MAN.
  • The best examples of MAN is the Cable television available in many cities.

Features of MAN (Metropolitan Area Network)

  • It may be owned by a single or multiple organization.
  • Uses a cable or wireless connection.
  • Private or public connection mediums.

WAN (Wide Area Network)

Wide Area Network

  • Stands Wide Area Network
  • Typically spans entire countries
  • A wide area network is a network of connecting two or more computes generally across a wide geographical area such as cities, districts, and countries.
  • Computer networking spanning or covers a regional, national or global area.
  • The transmission medium is usually telephone lines, microwaves, and satellite communication
  • Owned by multiple organization.
  • Lower data transfer rate as compared to LAN
  • It has data rate below 1 Mbps
  • Internet (public) and intranet (private) are the best examples of AN
  • Channels are relatively error-prone and slower as compared to LAN
  • Distance is :100km-1000km
  • The Internet is the best examples of WAN

Comparison of LAN, WAN, and MAN

S.N. Parameter LAN WAN MAN
1. Ownership of network Private Private or public Private or public
2. Area covered Small Very large (states or countries) Moderate (city)
3. Design and maintenance Easy Not easy Not easy
4. Communication Coaxial cable PSTN or satellite links Coaxial cables, PSTN, optical fiber cables, wireless
5. Data rates High Low Moderate
6. Mode of communication Each station can transmit and receive Each station cannot transmit Each station can transmit or receive transmit or receive
7. Principle Operates on the principle or broadcasting Switching Both
8. Propagation delay Short Long Moderate

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