👀 Network Monitoring & Detection

How security teams detect problems before they become disasters.

🌙 2:13 AM — Alert Triggered

Most employees are asleep.

The office is empty.

Applications continue running.

Servers continue processing requests.

Then suddenly:

🚨 ALERT DETECTED

A security analyst begins investigating.

🖥 SOC Visibility Pipeline

🤔 What Is Network Monitoring?

Network monitoring is the continuous observation of systems, devices, applications, and traffic.

Security teams monitor:

• Network availability
• Traffic patterns
• Authentication events
• Infrastructure health
• Security alerts

The goal is visibility.

📊 Typical SOC Dashboard

📄 Why Logs Matter

Logs are the security team’s memory.

Every day organizations generate:

• Firewall logs
• Authentication logs
• Application logs
• Server logs
• Cloud logs

Without logs, investigations become extremely difficult.

🧰 Practical Knowledge: Viewing Connections

Linux:

ss -tuln

Windows:

netstat -ano

These commands help identify:

• Listening services
• Active connections
• Unexpected activity

🔍 Tool Spotlight: Wireshark

One of the most recognized network analysis tools.

Wireshark allows analysts to:

• Inspect packets
• Analyze protocols
• Troubleshoot connectivity
• Understand traffic behavior

It is widely used in networking, security, and incident response.

🧠 What Is a SIEM?

Security Information and Event Management (SIEM) platforms collect and analyze logs from across the organization.

Popular platforms include:

• Splunk
• Microsoft Sentinel
• Elastic Security
• QRadar

A SIEM helps analysts investigate events from one central location.

⚠ The Alert Fatigue Problem

Not every alert is a real problem.

A large SOC may receive:

• Thousands of alerts daily
• Hundreds of warnings
• Many false positives

One of the biggest skills analysts develop is prioritization.

🚨 Real Investigation Example

An alert reports:

• Unusual login activity
• Outside normal business hours
• From an unfamiliar location

The analyst reviews:

• Authentication logs
• Firewall logs
• Network activity
• User history

This process is called triage.

💼 What SOC Analysts Actually Do

A typical day may involve:

• Reviewing alerts
• Investigating anomalies
• Analyzing logs
• Escalating incidents
• Documenting findings

The job is closer to investigation than hacking.

🧠 Analyst Challenge

Your monitoring system reports:

• Server CPU spikes
• Traffic increase
• Authentication failures

Which event deserves attention first?

How would you determine whether the events are related?

🏆 Key Lesson

You cannot protect what you cannot see.

Monitoring creates visibility.

Visibility enables detection.

Detection enables response.

This is the foundation of modern defensive security.

☁️ Modern Cloud Networks

Step inside AWS, Azure, and Google Cloud to understand how modern networking works when servers no longer live in your building.