Saylor Academy

Unit 6: Firewalls, Intrusion Detection, and Intrusion Prevention
In this unit, we will explore the use of security tools such as firewalls and intrusion prevention systems. Following a quick introduction to the concepts of intranet and extranet systems that are frequently used for information exchange by enterprises today, we will look into cryptographic concepts related to securing communication using firewalls. We will explore how firewalls work and will also study different types of intrusion detection systems including host-based and network-based systems.

Completing this unit should take you approximately 9 hours.
- Unit 6 Learning Outcomes Page
- 6.1: Security Protocols and Solutions
  - Indian Institute of Technology, Kharagpur: Indranil Sengupta's "Intranet, Extranet, Firewall" Page
    Watch this video. Following a brief introduction to intranets and extranets used frequently today by businesses, Sengupta explains cryptographic concepts related to securing communication using firewalls.
- 6.2: Firewall
  - The Open University: "Firewalls - An Overview" Page
    Read this page.
  - Jeff Tyson's "How Firewalls Work” URL
    Read this page.
- 6.3: Host-Based IDS vs. Network-Based IDS
  - Ricky M. Magalhaes' "Host-Based IDS vs. Network-Based IDS" URL
    Read this article about host-based and network-based intrusion detection systems.
- 6.4: Network Attacks and Defense
  - University of Cambridge: Ross Anderson's "Network Attack and Defense" URL
    Read this chapter. While you read, try to explain various attacks, the skills that are needed for carrying out these attacks, and how to defend your system against these attacks.

CS406: Information Security

Unit 6: Firewalls, Intrusion Detection, and Intrusion Prevention

6.1: Security Protocols and Solutions

6.2: Firewall

6.3: Host-Based IDS vs. Network-Based IDS

6.4: Network Attacks and Defense