This document discusses network security and firewalls. It defines security threats as risks that can harm computer systems, and notes that network security covers technologies, devices, and processes to protect network integrity, confidentiality, and accessibility. It describes how firewalls monitor incoming and outgoing traffic to block malicious traffic, and explains the importance of network security for trust, protection from malware, and secure online transactions.

1. Network Security & Firewall
Shafeeqa Farsana

2. Contents
• Security threats
• Network security
• Types of network security
• Firewall
• Importance of network security
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3. Security
Threats
Security threat is defined as a risk that which can
potentially harm computer systems and
organization. It can lead to loss or corruption of data
or physical damage to the hardware and/or
infrastructure.
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4. Network
Security
Network security covers multitude of technologies,
devices and processes. It is a set of rules and
configurations designed to protect the integrity,
confidentiality and accessibility of computer networks
and data using both software and hardware
technologies.
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5. How does it
work?
Authentication and Authorization
Authentication checks and verifies that it is indeed the
user belonging to the network who is trying to access
or enter it, thereby preventing unauthorized intrusions.
Authorization is the level of access to be provided to
the recently authenticated user. The admin of the
network needs access to the entire network, whereas
those working within it probably need access to only
certain areas within the network.
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6. Network Security
Controls
Physical network security
Technical network security
Administrative network security
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7. Types of Network
Security
Network Access Control
Antivirus and Antimalware Software
Virtual Private Networks
Security Information and Event Management System
Mobile Device Management
Firewall
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8. Firewall
A firewall is a network security device that monitors
incoming and outgoing network traffic and permits or
blocks data packets based on a set of security rules. Its
purpose is to establish a barrier between the internal
network and incoming traffic from external sources in
order to block malicious traffic like viruses and
hackers.
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10. Types of Firewall
Packet filtering
Circuit level gateway implementation
Acting as proxy server
Web application firewall
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11. Importance of
Network Security
Lack of trust in the privacy and eCommerce security
Malware, viruses, and frauds
Uncertainty and complexity in online transactions
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