📅 Day 41 – Networking Basics (Cloud & DevOps Foundations)

Welcome to Day 41 of our journey to master Cloud & DevOps!
Today we dive deep into Networking, the backbone of every cloud infrastructure and DevOps pipeline.

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🌐 What is Networking?

Networking is the practice of connecting computers, servers, and other devices so they can communicate and share resources over a network (like the internet or local network).

In Cloud & DevOps, networking is essential because:

• All cloud services interact via network protocols.

• CI/CD pipelines communicate with servers.

• Applications depend on APIs, DNS, and IP addresses.

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📌 Key Networking Concepts for Beginners

1. IP Address

• A unique identifier for a device on a network.

• IPv4 Example: 192.168.1.1

• IPv6 Example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334

• Types:

  • Public IP → Accessible from the internet.

  • Private IP → Used inside private networks.

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2. MAC Address

• Physical address assigned to your network interface card.

• Example: 00:1A:2B:3C:4D:5E

• Used for identifying devices on a local network.

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3. Ports

• Virtual doors through which data enters and leaves.

• Example:

  • Port 80 → HTTP (Web traffic)

  • Port 443 → HTTPS (Secure web traffic)

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4. Protocols

• Rules for communication between devices.

• Examples:

  • HTTP/HTTPS → Web communication

  • FTP/SFTP → File transfer

  • SMTP → Email

  • SSH → Secure remote login

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5. DNS (Domain Name System)

• Converts human-readable names into IP addresses.

• Example:

  • www.google.com → 142.250.190.46

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6. Ping & Latency

• Ping → Test if a device is reachable.

• Latency → Time it takes for data to travel.

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7. Subnetting

• Dividing a network into smaller networks for efficiency and security.

• Example: 192.168.1.0/24

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🛠 Hands-On Commands (Linux/Ubuntu)

# Check your IP address
ip addr show

# Check internet connectivity
ping google.com

# Display DNS resolution
nslookup google.com

# Display routing table
route -n

# Display active connections and listening ports
netstat -tulnp

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🔗 Connect with Me

• 📘 GitHub: ritesh355

• ✍️ Hashnode: ritesh-devops.hashnode.dev

• 💼 LinkedIn: ritesh-singh-092b84340

Built as part of a 40-day Containers & Automation journey. Let’s containerize the world! 🚢