Network security

CONTENT
1-Introduction
2-Definition
3-Threats
4-Solution
5-Conclusion
2

Introduction
While computer systems today have some of the best security system
ever,they are more vulnerable than ever before.
This vulnerability stems from the world wide access to computer
system via internet.
Computer and network security comes in many form
1-encryption algorithm
2-access to facilities
3-digital signatures
4-fingerprints and face scans as passwords
3

Definition:
Network security consist of provisions
and policies adopted by network
administrator to prevent and monitor
unauthorized
access,misuse,modification or denial of
computer network and network
accessible resources.
4

Threats
Many network security threats are spread over the internet.The most common
include:
1-Viruses and Worms
2-Trojan horses
3-Spyware
4-Adware
5-Hacker attack
5

1-Viruses
Viruses works and spread by attaching
themselves to other pieces of software
such that during the execution of the
program the viral code is executed.
Corrupt and modifies the system files on
your computer to cause damage
distributed to various storage medium
such as flash drive.
6

2- Worms
Worms are stand-alone software that does
not have to attach itself to a program in
your system like a computer virus
Damage the computer network by causing
increase bandwidth
7

3-Trojan horses
Trojan horses is a very deceptive program
that appear harmless but it is actually one of
the most dangerous type of malware
it may appear as a friendly email attached or
present itself as a useful application on a
website
It does not have the ability to self replicate
but to deliver destructive payloads and
viruses,worms and spyware.
8

4-Spyware
spyware is a software that gathers
information through the user's internet
connection without his or her
knowledge,usually for advertising
purposes.
Another kind of spyware may make
changing in your computer and cause
slowing down of computer or crashing
which can be annoying such as changing
your web page or adding additional
component.
9

5-Adware
Adware is essentially add-
supported software that has the
ability to track your activity.
10

6-HACKER ATTACK
In a computer security a hacker is the
one who seeks and exploits
weaknesses in a computer network.
Hackers may be motivated by
multitudes of reasons such as profit
,protest and challenge.
11

Network security is accomplished through software and hardware.The
software must be constantly updated and manage to protect you from
emerging threats.
network security may consist of many components. ideally all
components work together which minimizes maintenance and improve
security.
Network Security
12

Network security includes following components.
1- Anti - viruses and anti -spyware
2- Firewall -to stop unauthorized access to your computer
3- IPS- intrusion prevention system
4- VPNs- virtual private networks
Components
13

An anti virus software program is a computer program that can be used to
scan files to identify and eliminate computer viruses and other malicious
software.
Anti virus works in two different ways :
1-Examine file to look for unknown virus by mean of virus dictionary
OR
2-Identify suspicious behaviour from any computer program which might
indicate infection.
Anti virus
14

A system or combination of system that support and control access policy
between two networks .
A firewall can limit the type of transactions that enter a system, as well as
all type of transactions that leave the system.
it can also be programmed to stop certain type or ranges of
IP addresses, as well as certain type of TCp port numbers(applications).
Firewall
15

IPS is a network security/prevention technology that examines network
traffic flow to detect and prevent vulnerability exploits.
IPS has number of detection methods for finding exploits,but signature-
based detection and statistical anomaly based detections are two
dominant mechanisms.
IPS-intrusion prevention system
16

VPns are used to establish an encrypted connection across a network
while using internet as its transmission medium.
Two Benefits :
1-It is inexpensive
2-A secure data connection is established.
VPNs-virtual private network
17

CONCLUSION
we see that it is important to secure our network for various reasons because
they are used to store sensitive and important data which we want to keep
secure as it might be used for malicious content in the wrong hands
18

Saham Fatima
Mehru Nisa
Rabia Hashmat
20

Network security

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