Firewall-1

University of Babylon, IT College
Information Network Dep., Third Class, Second Semester
MTCNA Course
MikroTik Certified Network Associate
2015-2016
By M.Sc. I.T Alaa A. Mahdi
Objectives
• Firewall principles;
• structure;
• chains and actions + LAB;
• • Firewall Filter in action;
• filter actions;
• filter chains;
• protecting your router (input) + LAB;
• protection your customers (forward) + LAB;
• RouterOS connection tracking;
• impact on router;
• connection state + LAB;
Firewall principles
• Firewall is a system or device that allows
network traffic that is considered safe to
flow through it and prevent an insecure
network. Currently, the term firewall is a
common term that refers to the system that
regulates communication between two
different networks.
• The firewall implements packet filtering
and thereby provides security functions that
are used to manage data flow
• to the router,
• through the router, and
• from the router.
• Network firewalls keep outside threats away
from sensitive data available inside the
network. Whenever different networks are
joined together, there is always a threat that
someone from outside of your network will
break into your LAN. Firewalls are used as
a means of preventing or minimizing the
security risks inherent in connecting to
other networks. Properly configured
firewall plays a key role in efficient and
secure network infrastructure deployment.