This document discusses various methods of encryption for strong security, including VPN which is a comparatively cheap computer network that uses various protocols and options, WAN which is a computer network wider in scope than LAN or MAN and is often used as the opposite of LAN, firewall software that controls communication between an internal network and outside to defend the internal network, and TCP/IP which enables communication between computers with different operating systems. The document references Wikipedia for more information on each topic.
2. VPN(Virtual Private Network)
VPN is a computer
network.It is
comparatively
cheap.Moreover,
because various
protocols exist,
and various
options can be
used, It is used a
lot.
3. WAN(Wide Area Network)
WAN is a
computer
network that is
wider than LAN
and MAN. It is
often used as an
antonym of LAN.
4. Firewall
Firewall is a
Software to control
communication
between a certain
specific computer
network and the
outside, and to
defend internal
computer network.