Task Statement 1.4: Define logging and monitoring requirements across AWS and hybrid networks.
📘AWS Certified Advanced Networking – Specialty
1. Why Logging and Monitoring Are Important
In an AWS or hybrid network environment, logging and monitoring help you:
- Track network activity: See what’s happening across VPCs, VPNs, Direct Connect, or hybrid networks.
- Detect issues: Identify misconfigurations, performance problems, or security breaches.
- Meet compliance requirements: Some industries (finance, healthcare) require keeping logs for auditing.
- Troubleshoot efficiently: Logs help you trace errors in real-time, such as a failed connection or latency spike.
2. Key AWS Services for Logging and Monitoring
AWS provides multiple services for logging and monitoring. You need to know their purpose and when to use them.
2.1 Logging Services
| Service | Purpose | What It Logs |
|---|---|---|
| Amazon CloudWatch Logs | Stores log files from AWS services and custom apps | EC2 logs, Lambda logs, VPC Flow Logs, application logs |
| AWS CloudTrail | Tracks all API calls made in your account | User activity, service changes, security events |
| VPC Flow Logs | Monitors network traffic in/out of VPC interfaces | Source & destination IPs, ports, traffic allowed/denied |
| AWS Config | Tracks configuration changes | Security group changes, route table changes, IAM changes |
| S3 Access Logs | Logs access to S3 buckets | Who accessed the bucket, time, method |
| ALB/NLB Logs | Logs traffic to Application/Network Load Balancers | Client IP, request URL, target response |
2.2 Monitoring Services
| Service | Purpose | How It Monitors |
|---|---|---|
| Amazon CloudWatch Metrics | Measures performance in real-time | CPU, memory, network throughput, latency |
| AWS CloudWatch Alarms | Sends notifications based on metrics | Alert if CPU > 80%, latency spikes, or flow log drops |
| AWS Trusted Advisor | Monitors best practices | Security checks, network performance, cost optimization |
| AWS Network Manager | Monitors global networks (VPCs, VPNs, Transit Gateways) | Shows health, connections, routing issues |
3. Logging and Monitoring in Hybrid Networks
Hybrid networks combine AWS with on-premises environments. Logging and monitoring here must include both sides.
- VPN or Direct Connect logs: Use VPC Flow Logs and CloudWatch to check traffic patterns between AWS and your on-prem network.
- Firewall and NAT logs: Include logs from your on-prem firewalls or NAT devices. AWS cannot see traffic inside your on-prem network, so centralize logs in a SIEM system.
- Centralized logging: Aggregate logs from AWS services and on-premises systems in CloudWatch Logs, S3, or a SIEM like Splunk or Elastic Stack.
- Hybrid monitoring tools: AWS provides Network Manager and CloudWatch; you may also integrate with third-party monitoring tools for end-to-end visibility.
4. Identifying Logging and Monitoring Requirements
When designing a logging and monitoring solution, you must consider:
- What to log?
- API calls → CloudTrail
- VPC network traffic → VPC Flow Logs
- Resource configuration changes → AWS Config
- Application/OS logs → CloudWatch Logs
- Where to store logs?
- S3 for long-term storage
- CloudWatch Logs for short-term monitoring and real-time alerts
- How often to monitor?
- Real-time alerts → critical errors, security breaches
- Periodic review → configuration drift, compliance audits
- Who needs access?
- Security team → security events
- Network team → network traffic patterns
- Operations team → resource health
- Retention and compliance:
- Determine retention policy for logs (e.g., 90 days, 1 year, or per regulatory requirement)
5. Best Practices for AWS Network Logging & Monitoring
- Enable CloudTrail in all regions: Captures all API activity globally.
- Use VPC Flow Logs for all VPCs/subnets: Helps detect suspicious traffic.
- Set CloudWatch Alarms for critical thresholds: High latency, packet drops, VPN downtime.
- Aggregate logs in a central location: Makes hybrid network monitoring easier.
- Automate log analysis with Lambda: For example, automatically detect unusual traffic spikes.
6. Exam Tip: What You May Be Tested On
- Identify which AWS service is used for logging API calls → CloudTrail.
- Identify which AWS service is used for monitoring network traffic → VPC Flow Logs.
- Describe monitoring strategy for hybrid networks (AWS + on-premises).
- Understand best practices for storing, securing, and retaining logs.
- Differentiate monitoring metrics vs. logging data.
✅ Summary in Simple Words
Logging tells you what happened, monitoring tells you what is happening now. For AWS networks (VPCs, VPNs, Direct Connect) and hybrid networks, you must identify:
- What to log → traffic, API calls, config changes
- Where to log → CloudWatch, S3, SIEM
- What to monitor → performance, traffic patterns, health
- Who uses the logs → teams, compliance
- Retention and alerts → how long to keep, what triggers alarms
This is enough to pass Task 1.4 on identifying logging and monitoring requirements.
