Hands-on Network Debugging & SSH Access

Learning Objectives

Investigate Network Configuration Issues

Identify network interfaces, IPv4 addresses, subnet masks, and gateways

Diagnose DNS and Network Activity

Analyze network statistics to detect congestion or dropped packets

Use an SSH key (.pem file) to connect securely to a remote server

Overview

At GlobalNet Solutions, a critical Apache server has become inaccessible via its hostname, disrupting web services and ongoing deployments. As a DevOps engineer, your responsibility is to systematically diagnose and restore connectivity by investigating network configurations, DNS resolution, and secure server access via SSH.

This hands-on scenario will guide you through essential network troubleshooting techniques, covering network configurations, DNS resolution, and SSH connectivity, which are crucial for maintaining server accessibility and minimizing downtime.

Prerequisites

Basic Linux command-line skills (e.g., ls, cd, ping, netstat, dig, etc.)
Familiarity with networking concepts (IP addresses, subnet masks, DNS, and routing)
Understanding of SSH authentication (public-private key pairs and .pem files)
Access to a Linux-based system or cloud environment to practice commands