A Firewall is a network security monitors and filters incoming and outgoing network traffic based on an organization's previous established security policies. View this presentation now to understand network security and firewall in network security. Happy learning!!

1. FIREWALLS IN NETWORK SECURITY
INTRODUCTION TO FIREWALL IN NETWORK SECURITY

2. WHAT IS NETWORK SECURITY?
Network security is any activity designed to protect the usability and integrity of your network and data. It
includes both hardware and software technologies. Effective network security manages access to the network. It
targets a variety of threats and stops them from entering or spreading on your network.

3. UNDERSTANDING FIREWALL
 Firewalls come in many different shapes and size and sometime the firewall is a collection of several different
computer.
 All communication must pass through the firewall.
 The effectiveness of the firewall is greatly reduced if an alternative network routing path
 The firewall permits only traffic that is authorized.
 The firewall cannot be relied upon to differentiate between authorized and unauthorized traffic

4. TYPES OF FIREWALL
Proxy Firewall Stateful Inspection
3.Unified Threat
Management (UTM)
Firewall
4.Next-Generation
Firewall (NGFW)
5.Threat-Focused NGFW

5. FIREWALL PACKET FILTERS

6. INSIGHT INTO FIREWALL PACKET FILTER
 Simplest of components
 Uses transport-layer information only
 IP Source Address, Destination Address
 Protocol/Next Header (TCP, UDP, ICMP, etc)
 TCP or UDP source & destination ports
 TCP Flags (SYN, ACK, FIN, RST, PSH, etc)
 ICMP message type

7. FIREWALL OUTLINES
 Packet filtering
 Application gateways
 Circuit gateways
 Combination of above is dynamic packet filter

8. FIREWALL GATEWAY
 Firewall runs set of proxy programs
 Proxies filter incoming, outgoing packets
 All incoming traffic directed to firewall
 Policy embedded in proxy programs
 Two kinds of proxies
 Application-level gateways/proxies
 Circuit-level gateways/proxies

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