Network security involves implementing physical and software measures to protect a network from unauthorized access and enable authorized access. It aims to maintain confidentiality of data, integrity of data, availability of resources, and privacy of personal data. Key aspects of network security include encryption to scramble data, firewalls to control access to networks, and securing wireless networks through standards like WPA2. Common security processes also involve backing up data regularly, using access controls like passwords, and encrypting data during storage and transmission.

4. Introduction:
Network security is an organization’s strategy that
enables guaranteeing the security of its assets including
all network traffic. Access to the network is managed by
effective network security, which targets a wide range of
threats and then arrests them from entering in the
network.

5. What is network security?
Network security is the process of taking physical and
software preventative measures to protect the underlying
networking infrastructure from unauthorized access,
misuse, malfunction, modification, destruction, thereby
creating a secure platform for computers, users, and
programs.

6. Why do we need security?
Network security is needed to:
1.Prevent unauthorized access to the network that is of
potential threat to the network and its resources.
2.Ensure that the authentic users can effectively
access the network and its services.
3.Applications that can protect the network from
unauthorized access are in place.

7. Goals Of NETWORK SECURITY
1. Ensures the confidentiality of resources
2. Protect the integrity of data
3. Maintain availability of the IT infrastructure
4. Ensure the privacy of personally identifiable data
5. Enforces access control
6. Monitor the IT environment for violations of policy

9. 1.In cryptography, encryption is the process of
transforming information using an algorithm to make
it unreadable to anyone except those possessing
special knowledge, usually referred to as a key.
2.The reverse process, to make the encrypted
information readable again, is referred to as
DECRYPTION.
ENCRYPTION

10. Types
Symmetric key
-In symmetric-key schemes, the encryption and
decryption keys are the same.
Public key
-In public-key encryption schemes, the
encryption key is published for anyone to use
and encrypt messages.

11. Uses
1.Encryption can be used to protect data "at rest",
such as files on computers and storage devices
(e.g. USB flash drives).
2.Encryption is also used to protect data in transit
3.Encryption, by itself, can protect the confidentiality
of messages.

12. 1.Disk encryption software
2.File/folder encryption
3.Database encryption
4.Communication encryption software
5.Network traffic encryption tools
1.Generic
2.IPSec based
APPLICATIONS

14. WIRELESS SECURITY
 Wireless security is the prevention of
unauthorized access or damage to
computers or data using Wireless
networks.

15. 802.11 SECURITY
1. Wired Equivalent Privacy (WEP)
2. Wi-Fi Protected Access (WPA)
Figure 2: Wi-Fi Protected Access

16. Wireless Medium
 Open medium.
 Broadcast in every
direction.
 Anyone within range can
listen in.
 No Privacy.
Figure1:Wireless Medium

17. WPA2
WPA2 replaced WPA.
 Began in September, 2004
WPA3
 January 2018, the Wi-Fi Alliance
announced WPA3 as a replacement to
WPA2.

18. Other ways to secure a Wireless Network
 MAC filtering:
Easy to spoof a MAC
address.
Force users to authenticate
using a
username/password.
 VPN tunnel between
computer and AP.

20. SECURITY PROCESSES:
Some data is also confidential; not only do you want
to lose it, you don’t want others to even view it
without authorization.
Let’s look at some ways to protect your all important
user data from loss and/or unauthorized
access.

21. SECURITY PROCESSES: 9 WAYS
 Back up early or often
 Use file-level and share-level security
 Password-Protect Documents
 Use EFS Encryption
 Use Disk Encryption

22. SECURITY PROCESSES: 9 WAYS
 Make use of a public key infrastructure
 Protect data in transit with IP Security
 Secure Wireless Transmissions
 Use Rights Management to retain Control

24. Firewall
• A network security system.
• Establishes a barrier.
• Acts as a DHCP server.

25. Firewall Operations

26. Types of firewall
• Hardware firewall
• Software Firewall
Proxy
State inspection
Packet filter

27. Types of controls
• Service control
• Direction control
• User control
• Behavior Control