Network and System Administration · Unit 7
Firewall and Network Security
Exam-focused notes for Firewall and Network Security (Network and System Administration, BIT451): what the TU syllabus asks and how it has actually been tested, with 3 solved past questions from this unit.
What this unit covers
- Firewall concepts and requirements
- Packet-level firewall operation
- Application-level firewall operation
- Firewall configuration using iptables
- Firewall configuration using firewalld
- Access Control Lists (ACL)
- SSH, HTTP, HTTPS port configuration
Firewall concepts and requirements
What is the use of firewall? Explain packet level and application level firewall. [5]
A firewall is a network security system that acts as a barrier between an organization's internal network and untrusted external networks (such as the Internet). Its primary uses are: - Monitor and control incoming and outgoing network traffic based on pred...
Full solved answer →What do you understand by Firewall? Why is it required? Differentiate between packet-level and application-level firewall.[10]
A firewall is a network security system that acts as a barrier between an internal network (or a computer) and external networks (such as the Internet). It monitors and controls incoming and outgoing network traffic based on predetermined security rules and...
Full solved answer →Firewall configuration using iptables
Describe firewall configuration using iptables or firewalld to allow: SSH, HTTP/HTTPS and Custom port. [5]
iptables is a command-line utility for configuring Linux kernel firewall rules. Here's how to configure it: 1. Allow SSH (port 22): 2. Allow HTTP (port 80): 3. Allow HTTPS (port 443): 4. Allow Custom Port (e.g., port 8080): 5. Set default policy and allow e...
Full solved answer →Make Unit 7 stick
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