1. Firewalls Julie Petrusa S.A.M. Matiur Rahman Carlo Mormina

2. Introduction What is a firewall? What does it protect you from? Benefits of a firewall. What it can’t protect you from. Types of firewalls. Composition of a typical firewall. Observations and conclusion.

3. What Is A Firewall?

4. What Is A Firewall? (con’t)

5. What Firewalls Protect You From

6. Benefits Of A Firewall (Advantages)

8. What Can A Firewall Not Do?

9. Types Of Firewalls Conceptually there are two types of firewalls: Network Level- Makes decisions based on resources, destination address of packets.

10. Application Layer – Generally are hosts running proxy servers which permits no traffic directly between networks

11. Composition Of A Typical Firewall Packet-filtering router Filtering rules are based on packet header information provided by the IP Process Application-level gateway(or proxy server) Proxy code is configured by a network administrator for acceptable security features Circuit-level gateway The firewall is easier on the internal users allowing them reasonable access to the internet, but stricter formalities from external attacks

12. Observations & Conclusion -As with software, one must choose a type of firewall to implement, that is best suited according to security needs. -Security standards of firewalls become obsolete very quickly. -Firewalls should not be the only line of security, it should be be used in conjunction with virus software and encryption devices. -It is estimated that 80% of successful hacks are carried out on networks with firewalls. -Recent hacks into the Pentagon and Microsoft has made people wonder about the efficiency of firewalls.

13. Observations & Conclusion -A firewall is a critical piece of software and shouldn’t be viewed as one-style-fits-all configuration. -Cost of typical firewall: (Ex. CISCO firewall) NT Server : 4000.00 Netscape Proxy server software: 995.00 Workstation config.(approx. 30 hr install.)3000.00 Proxy and WINS S/W(approx. 10 hr install.)1000.00 Total Cost: $8995.00