Firewall

Firewall : Firewall is one of the most popular techniques of network security. Firewall provides logical security to organization data and network.

Firewall is a computerized electronic system, installed between organization private network and public network to protect organization private network from unauthorized access.

Firewall is a control for invasive type of subvasive threats. Firewall is like an insulate which insulate organization private network from invaders coming through public network.

Firewall

National Animals of some Countries

»»    Canada : Eagle

»»    India : Tiger

»»    Australia : Kangaroo

»»    Japan : Ibis

»»    New Zealand : Kiwi

»»    United Kingdom : Robin Redbreast


(Image Source : wikimedia.org)

Bluetooth

Bluetooth : Bluetooth is a technology which enables mobile phones,computers and PDAs to communicate with each other in a short range or distance with wireless facility i.e. without connecting with each other by using wires or cables.

Bluetooth Symbol

Bluetooth enables its users to coordinate data between mobile phones, computers and printers for sending, receiving and printing information without the need of connecting to each other.

Bluetooth requires a low cost trans-receiver chip in each device, this chip enables to transmit and receive the data in certain predefined frequency band of 2.45 GHz.

Other than data exchange, the Bluetooth also enable to use voice channels. Bluetooth connection can be peer to peer (i.e. point to point) and multi point, but normally works in the short range.


Bluetooth technology got this name in honour of Herald Bluetooth, the King of Denmark in the 10th century.