Question

Firewalls & Network Security course

FIREWALL BASICS

a long and comprehensive explanation by typing please

1.WHAT ARE FIREWALL ENHANCEMENTS?

2.WHAT CONSTITUTES GOOD FIREWALL RULES?

Enumeration

ENUMERATE WINDOWS OS TARGETS AND SERVICES?

Answer 1

1. A firewall is a system that is designed to prevent anauthorized access from entering a priviate network by filtering the information that comes in from the internet. A firewall blocks unwanted traffic and permits wanted traffic, firewall purpose is to create safety barrier between a private network and the public internet. The Firewalll Enhancements are:

• Application Control
• Device Control
• Antivirus
• Intrusion Prevention

2. A firewall works by filtering the incoming networ data and determines by its rules if it is allowed to enter a network, these rules are also known as access control list. these rules customized and are determined by the neetwork administrator. the administrator decide not only what can enter a network but also what can leave a network. these rules either allow or denies permission.

Permission

IP Adress

Protocol

Destination

Port

accroding to the above table set by network administrator, according to the rules in firewall access control list. it shows list of IP Address that have been allowed or denied by this firewall, traffic from some IP Adress are allowed to enter this network. firewall rule don't just make rules based in IP Adresses, but they can also make rules based domain names, protocols, programs, ports and keywords.

The Good Firewall Rules are:

• LAN to WAN access
• WAN to LAN Access
• LAN to LAN Access

3. Enumeration is the process to discover potential attack vectors in the system. it is used to gather in following ways:

• Hostnames
• Networks shares and services
• Application and banners
• usernames and groupnames