This document discusses network security. It defines a network as a collection of connected computers and devices that allow users to share data and information. Examples of networks include local area networks (LANs) within homes, schools, or offices, as well as the Internet. The document outlines various network security threats such as sniffing, spoofing, phishing, and using shared computers. It also discusses internal threats from employee theft, privilege abuse, and equipment failure. Methods for improving network security include using virtual private networks, identity management, antivirus software, access control, firewalls, intrusion detection, and encryption. The goals of network security are confidentiality, authentication, integrity, and availability of data and systems.

2. Network Security

3.  Network is a collection of computers and
devices.
 Allow user to share data , information with
other user.
 example of a network is the Internet, which
connects millions of people all over the world.
 network may be linked through cables,
telephone lines. common types of networks i:
Local Area Network (LAN) (home, school,
laboratory, or office)

4.  Security in general means freedom from risk
 Security is like the break in your car, it slows
you down but it also makes it possible for
you to go a lot faster.

5.  Network security is protection of the access
to files and directories in a computer
network against hacking, misuse and
unauthorized changes to the system.
 Only network security remove virus.

6.  EXTERNAL ATTACKS
 Sniffing
 Spoofing
 phishing.
 Shared computer
1. SNIFFING. monitor every packets that crosses the network.
2. SPOFING. hide one's true identity on the network.(fake email,
fake i.p address)
3. Phishing:
Phishing is the process to gain sensitive information like
usernames, passwords and credit card information, frequently
for negative use.
4. Shared computer. sharing a computer with one or more
people..password, clear search history, logout completely

7.  . Employee theft:
Employee theft can be characterized as any
stealing, utilize or abuse of business benefit
without permission.
 Privilege abuse: abuse it to satisfy their
requirements or to destroy the organization
reputation.
 Equipment failure: in which any equipment
 can’t complete its intended task or reason. It
can also mean that the hardware has stopped
working.

8.  Virtual Private Network.
Provide access control and data encryption between
two different computer on network.
 Identify Management.
It is a term , related to how humans are identified
and authorized across computer network.
 Anti-Viruses Software.
necessary part of good security program.
Anti viruses only protect organization from malicious
programs.
 ACCESS CONTROL.
Service must be accessible to users.
Prevent un-authorized access to resources.

9.  Firewalls. Protecting an organization’s
internal from external attacks.
 Intrusion Detection. No longer would we
need to protect our files and system. We
could just identify when someone was doing
something wrong and stop them.
 Encryption. the process of converting
information or data into a code, especially to
prevent unauthorized access.

10.  Confidentiality
 Authentication
 Integrity
 Availability

11.  Keeping the data secret.
 No third party include.
 Only sender and receiver understand
message contents.
 Example
 Military (secret data, top secret data)

12.  the process or action of verifying the identity
of a user..

13.  Integrity ensure that data is protected against
any un-authorized or accidental change.

14.  availability means that when a user needs to
get to information, he or she has ability to do
this.

15.  Protect data
 Prevents cyber attack
 Centralized updates(timely update software
reduce the risk of attack)

16. Costly set-up. (Purchasing the
software, installing it etc can become costly
especially for smaller networks.
 Careless admin.( regularly to
keep a check on the malicious
users. But sometimes, he just
trusts the system and that is
when the attack happens)