Presentation

Introduction to Network security.

Need For Network Security.

Types Of Network Security.

Tools For Network Security.

In the field of NetworkSecurity (NA )Network Adminstrator prevents theunauthorized accessI.e. Misuse, Modification etc. The Network security involves in

the Organisations , Enterprices and other types of

institutions.

Recently , Network Security was

Fueled by the crime committed

By the Kevin Mitnick. He used

Large amount Of computers for

crime. Since Then, Network

Security came into spotlight.

Types

VPN WNS

VPN

ClientInternet

VPN

Server

VPN Tunnel

Corporate

Network

VPN uses the PPTP

Protocol, That stands for

The Point To Point Tunneling Protocol. It is

Microsoft product. It was

Used in 1998.

WNS stands for Wireless

Network Security. WNS was

Implemented in the 1969,

4 Years before Ethernet`s birth.

This Technology use the Radio

Frequency Transmission.

Attacks

Passive Attacks Active Attacks

Eavesdropping

Traffic Analysis

Masquerade

Replay

Message Modification

EAVESDROPPING = In This, Hacker

Hacks info. During Telephone

Conversation,Message Transmission.

TRAFFIC ANALYSIS = In This,

Attack is done in Encrypted form

,He knows info. In Encrypted form.

He also determines the user`s

Location.

MASQUERADE = In This Type,

Hacker hacks user`s Privilege.

REPLAY = In This, Hacker captures

The info. & retransmit it back to

Produce unauthorized access.

MESSAGE MODIFICATION =

Message modification after hacking

Info.

DENIAL OF SERVICE =

Termination of normal communi.

Tools

Firewalls IDS NAT

Firewall is collection of computers

Which stands b/w the Trusted

Networks. For effective communi.

Firewall must include :-

All communi. Should pass through

Firewall.

Firewall must permit to the

Authorised communi.

Firewall must capable to protect

Itself.

Firewall uses restricted access.

This is used for single goal.

Operating System independence.

Better performance.

Less Expensive.

Small reason may cause of failure.

H/W Firewall more costlier than

S/W Firewall.

Difficult to Install.

Takes Large amount of Physical

Space.

It stands for the Instrusion

Detection System . This device is

Used to inspect all Network

Traffics, Alerts the user when

There has been unauthorised

Access. It doesn`t slow the

Network.

Types

HIDS NIDS SIDS

NAT stands for Network Address

Translation. It is used by IP to

Maintain the public IP Addresses

,

Separate from the private IP

Addresses . NAT`s functionality is

Performed on Pouters & other

Gateway devices.

Types

Unidirectional

NAT

Port Based

NAT

Overlapping

NAT

Bidirectional

NAT