| Security |
Internet security
is the prevention of unauthorized access and/or damage
to computer systems via internet access. Most that gives
a user access to a[1]program or system.
Internet security professionals should be fluent in
the four major aspects:
- Penetration testing
- Intrusion Detection
- Incidence Response
- Legal / Audit Compliance
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Routers
Network Address Translation (NAT) typically has the effect
of preventing connections from being established inbound
into a computer, whilst permitting connections out. For
a small home network, software NAT can be used on the
computer with the Internet connection, providing similar
behaviour to a router and similar levels of security,
but for a lower cost and lower complexity. |
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Firewalls
A firewall blocks all "roads and cars" through
authorized ports on your computer, thus restricting unfettered
access. A stateful firewall is a more secure form of firewall,
and system administrators often combine a proxy firewall
with a packet-filtering firewall to create a highly secure
system. Most home users use a software firewall. These
types of firewalls can create a log file where it records
all the connection details (including connection attempts)
with the PC. |
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Anti-virus
Some people or companies with malicious intentions write
programs like computer viruses, worms, trojan horses
and spyware. These programs are all characterised as
being unwanted software that install themselves on
your computer through deception.
Trojan horses are simply programs that conceal their
true purpose or include a hidden functionality that a
user would not want.
Worms are characterised by having the ability to replicate
themselves and viruses are similar except that they achieve
this by adding their code onto third party software.
Once a virus or worm has infected a computer, it would
typically infect other programs (in the case of viruses)
and other computers.
Viruses also slow down system performance and cause
strange system behavior and in many cases do serious
harm to computers, either as deliberate, malicious damage
or as unintentional side effects.
In order to prevent damage by viruses and worms, users
typically install antivirus software, which runs in the
background on the computer, detecting any suspicious
software and preventing it from running.
Some malware that can be classified as trojans with
a limited payload are not detected by most antivirus
software and may require the use of other software designed
to detect other classes of malware, including spyware. |
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