ppt on firewall report

8/4/2019 Ppt on Firewall Report

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Submitted To: Submitted By:

Ms. Gagandeep Sunita Sihag

(Lect. In CSE Dept.)7357(cse7thsem.)

SEMINAR REPORT

ON

FIREWALL


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INTERNET

INTERNET

Firewall

Protected

Network

WHO ? WHEN ?WHAT ? HOW ?

My

PC

Rules Determine


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1.packet filtering firewalls

2.circuitlevel gateways

3.application gateways

4.stateful multilayer inspection firewall


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These firewalls work at the network layer ofOSI model or IP layer of TCP/IP.

In a packet filtering firewall, each packet is

compared to a set of criteria before it isforwarded. Pass the packet through a set of rules, based

on the contents of IP and transport header

fields of packet


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They can filter packets at the Applicationlayer of OSI or TCP/IP model.

It is also called a proxy server because it

acts like a proxy and decides about the flowof application level traffic.


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These firewalls work at the Session layer ofOSI model or TCP/IP layer of the TCP/IP.

Circuit level gateways are relatively

inexpensive and have advantage of hidinginformation about the private network theyprotect.

They do not filter individual packets.


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It combine the aspects of other three typesof firewalls.

It provides a greater level of security control

by enforcing security policies at theapplication socket. A typical communication session between

two computers will consists a several

thousand packets, each of which is identifiedby a unique source and destination addressand sequence number.


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Firewalls protect private local area networkfrom hostile intrusion from the internet.

The greatest advantage is that no direct

connections are allowed through the firewallunder any circumstances. Provide a controlled access to sensitive

systems.

Relatively inexpensive or free for personaluse


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Firewalls cannot protect you from internaldestructions within a network.

The configuration can be too complex toimplement correctely.

Firewalls offer weak defence from viruses.The most obvious being that certain types of

network access may be hampered or even

blocked for some hosts, including telnet, ftpetc.


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Firewalls will continue to advance as the attackson IT infrastructure become more and moresophisticated

More and more client and server applications are

coming with native support for proxiedenvironments

Firewalls that scan for viruses as they enter thenetwork and several firms are currently exploring

this idea, but it is not yet in wide use.


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ppt on firewall report

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