Network security (syed azam)

Presentation
on
NETWORK SECURITY
By Syed Azam , BCA Group “c”
Semester IV , Year 2nd, Roll No. 1501018183
Integral University , Lucknow
sayyedazam246@gmail.com

NETWORK SECURITY
1. INTRODUCTION:- Network security is protection
of the access to files and directories in a computer
network against hacking, misuse and unauthorized
changes to the system.

TYPES OF NETWORKS
• Local Area Network is a computer network that spans a
relatively small area. Most often, a LAN is confined to a single
room, building or group of buildings,

INTERCONNECTED NETWORKS
• Internetworking is the practice of connecting a
computer network with other networks through the use of
gateways that provide a common method of routing
information packets between the networks

HETEROGENEOUS NETWORKS
• A Heterogeneous Network is a network connecting
computers and other devices with different
operating systems and/or protocols.

CAMPUS AREA NETWORK (CAN)
• Campus Area Network (CAN) is a computer network.
It is made up of two or more Local Area Networks
(LANs) within a limited area.

METROPOLITAN AREA NETWORK
(MAN)
• Metropolitan Area Network (MAN) is the
interconnection of networks in a city. Generally,
Metropolitan Area Network (MAN) is not owned by a
single organization.

WIDE AREA NOTWORK (WAN)
• Wide Area Network (WAN) covers a wide geographical area
which includes multiple computers or Local Area Networks
(LANs).

REMOTE ACCESS
• Remote access is the ability to get access to a
computer or a network from a remote distance.

Why do we need security?
• Protect vital information while still allowing
access to those who need it
– Trade secrets, medical records, etc.
• Provide authentication and access control for
resources
– Ex: AFS

Who is Vulnerable?
• Financial institutions and banks
• Internet service providers
• Pharmaceutical companies
• Government and defense agencies
• Multinational corporations
• ANYONE ON THE NETWORK

WHAT ARE THE THREATS?
• Natural disaster
• Computer Viruses
• Hacker Attack
• The biggest problem with the hacker threat is
that hacking is fun!

AREAS OF SECURITY WEAKNESS
• Well-known (and easily guessed) passwords
• Poorly implemented logon settings
• Disks and electronic mail that carry viruses

WHO ARE THE HACKERS?
• Common People
• Computer Expert
• Professional for Hacking

THE INTERNAL THREAT
• Recent online survey by Network World magazine
revealed that most security experts and readers felt
that internal employees were the biggest threat to
their information systems

METHODS OF ATTACKS
A denial-of-service (DoS) is any type of attack where the
attackers (hackers) attempt to prevent legitimate users
from accessing the service.

TCP Attacks
 A TCP sequence prediction attack is an attempt to predict the sequence number
used to identify the packets in a TCP connection, which can be used to counterfeit
packets. The attacker hopes to correctly guess the sequence number to be used by
the sending host

Packet Sniffing Attacks
 Packet sniffing, a network attack strategy, captures network traffic at the
Ethernet frame level. After capture, this data can be analysed and
sensitive information can be retrieved.

Back Door Attacks
• Attacker gaining access to a network and
insert a program or utility that creates an
entrance for an attacker.

Password Guessing Attacks
• Password Guessing Attacks - This occur when an account is
attacked repeatedly. This is accomplished by sending possible
passwords to an account in a systematic manner.
 Brute-Force Attack
 Dictionary Attack

COUNTER MEASURES
DEFINING SECURITY
Identification and authentication
Access control
Accountability and auditing
Data exchange

SECURITY COSTS
• Consider how much your organization can afford to
spend on security.
• There are also direct costs, such as equipment costs,
as well as administrative expenses.

PROTECTIVE MEASURES
• Create security policies, plans, and job positions as
appropriate.
• Set up a security-response team, experts who
handle security problems

FAULT TOLERANCE AND REDUNDANT
SYSTEMS
• Fault-tolerant systems are designed to withstand
hardware failures.
• A fault-tolerant feature called disk mirroring writes
data to two disks at the same time.

BACKUPS
Backups are essential. You already know that.
• If your systems are stolen, destroyed by fire, or
corrupted by hackers, you'll need to go back to the
last uncorrupted backup.

ENCRYPTION
• You can use cryptographic techniques to protect files
stored on disks and backups from prying eyes, or to
conceal data transmissions and electronic mail.

Firewalls
• Basic problem – many network applications and
protocols have security problems that are fixed over
time.
• Administrators limit access to end hosts by using a
firewall
• Firewall is kept up-to-date by administrators

VIRUS PROTECTION
Viruses are a real threat to your network
They are easily contracted form unknown disks or by
downloading files form online services, bulletin boards,
and the Internet.
Antivirus Software
Detecting and Cleaning up a virus infection
Improve Security

SOCIAL PROBLEM
People can be just as dangerous as unprotected
computer systems
– People can be lied to, manipulated, bribed,
threatened, harmed, tortured, etc. to give up
valuable information

CONCLUSION
• Conclude my seminar saying that as hackers and
many algorithms are there to break passwords and
much valuable information, which leads to a great
loss .
• Hence network security provides the remedy by
many ways.
THANK YOUBy Syed Azam, BCA

Network security (syed azam)

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