What is a firewall? Can you provide any examples of
firewalls?
network security device or software that controls incoming and outgoing network traffic based on security rules:
- Packet Filtering(ip)
- Stateful Inspection(active connections)
• If I want to block incoming traffic on port 8080 on Linux
machine. How do I do that?
firewall tool like iptables or firewalld (sudo iptables -A INPUT -p tcp –dport 8080 -j DROP)
• What is the function of the Linux kernel?
bridge between the hardware and the software layers of a computer system
• Can you explain what LDAP is?
It’s a protocol used for accessing and managing directory information over a network(used for authentication, authorization)
• Say for example you want to run a script on a recurring day
at a certain time, can you think of any way to do this in
Linux?
Tools such as cron and shell scripting. Time in editor and path
• What is OOP and what are the four basic principles?
Encapsulation, Inheritance, Polimorphism, Abstraction
• What is a class/variable/array?
A class is a template for creating objects(defines attributes and methods)
A variable is a named storage that holds a value
Array is a collection of elements of the same data type
• What is the difference between a ‘While’ and ‘For’ loop?
While – specify a condition that is checked before each iteration of the loop
For Loop – The loop iterates over each item in the sequence until the end is reached.
