🚀 30 Days Windows Server 2016 Interview Series

 🚀 30 Days Windows Server 2016 Interview Series

🔹 Day 23 – Performance Tuning & Optimization

A good System Administrator does not just fix problems — they optimize performance before issues happen. Performance tuning questions are common in L2/L3 and System Admin interviews 👇

Q1. What is Performance Tuning?

👉 The process of improving server speed, stability, and resource usage.

Q2. Which tools are used for performance monitoring?

👉 Task Manager, Performance Monitor, Resource Monitor, and Event Viewer.

Q3. What causes high CPU usage?

👉 Heavy applications, background services, or malware.

Q4. What causes high memory usage?

👉 Memory leaks, excessive applications, or insufficient RAM.

Q5. How do you identify disk bottlenecks?

👉 Check disk queue length and disk latency in Performance Monitor.

Q6. What is Performance Baseline?

👉 A record of normal system performance used for comparison.

Q7. How can you optimize server performance?

👉 Remove unnecessary services, update drivers, and apply patches.

Q8. What is Page File?

👉 Virtual memory used when physical RAM is full.

Q9. Why is regular maintenance important?

👉 Prevents performance degradation over time.

Q10. What is Capacity Planning?

👉 Planning hardware resources based on future growth

Networking Fundamentals – The Foundation of Every Cloud & DevOps Journey

Before cloud, before automation, before CI/CD… there is networking.

Understanding networking fundamentals has completely changed how I see infrastructure and system design. Here’s a quick summary of the core concepts every tech professional should master:

🔹 IP Addressing – Every device needs an identity. IPv4 & IPv6 help systems locate and communicate with each other.

🔹 Subnetting – Dividing networks into smaller segments improves performance, organization, and security.

🔹 DNS (Domain Name System) – The internet’s phonebook. Converts domain names into IP addresses.

🔹 TCP vs UDP –

TCP = Reliable, connection-based communication

UDP = Faster, lightweight, connectionless communication

🔹 OSI Model – The 7-layer framework that explains how data travels from sender to receiver.

🔹 Routing & Switching –

Switches move data within a local network

Routers move data between networks

🔹 Firewalls & Security Groups – Control traffic flow and protect network resources.

 Why this matters?

In Cloud & DevOps, when configuring VPCs, load balancers, or troubleshooting connectivity issues, networking knowledge is not optional — it’s essential.

Strong networking skills = Better architecture decisions + Faster troubleshooting + Secure deployments.

🚀 Networking Protocols Made Simple – Visual Learning!

Understanding networking becomes easy when you connect concepts with real-world analogies.

Here’s a quick breakdown of essential protocols every IT & Cybersecurity professional should know:

🔎 DNS – The Internet’s Phonebook

Translates domain names into IP addresses so browsers know where to go.

🏷️ DHCP – The IP Distributor

Automatically assigns IP addresses to devices in a network.

📡 ARP – The MAC Finder

Maps IP addresses to MAC addresses inside a local network.

🔐 HTTPS – Secure Web Communication

Ensures encrypted and secure data transfer between client and server.

🛡️ TLS – Encryption Guardian

Protects data in transit with strong cryptography.

📶 ICMP – Network Health Checker

Used for ping and troubleshooting connectivity issues.

⏰ NTP – Time Synchronizer

Keeps all devices in a network aligned with accurate time.

📊 SNMP – Network Monitoring Agent

Monitors and manages network devices like routers and servers.

🎟️ Kerberos – Authentication Master

Provides secure identity verification using tickets.

💡 Mastering these fundamentals builds a strong foundation in Networking, Cybersecurity, and Cloud.