Radical Technologies Linux System Administrator Interview Questions and Answers

Port numbers are used to identify specific services running on a server. Common ports include 80 for HTTP and 22 for SSH.

• HTTP - Port 80

• HTTPS - Port 443

• SSH - Port 22

• FTP - Port 21

• SMTP - Port 25

• DNS - Port 53

DNS servers are responsible for translating domain names into IP addresses, enabling communication between devices on the internet.

• DNS servers store and manage a database of domain names and their corresponding IP addresses.

• They facilitate the process of resolving domain names to IP addresses, allowing devices to communicate with each other.

• DNS servers use a hierarchical structure, with root servers, top-level domain s...read more