Describe the process of packet switching

Types and Methods of Data Transmission 🚀

1️⃣ Wired Transmission

Uses physical cables (e.g., Ethernet, fiber‑optic). Data travels as electrical or light pulses.

2️⃣ Wireless Transmission

Uses radio waves (Wi‑Fi, Bluetooth, cellular). No physical connectors; data is sent as electromagnetic waves.

3️⃣ Optical Transmission

Uses light signals through fiber‑optic cables. Offers high bandwidth and low interference.

🔄 Packet Switching – The Core of the Internet

Imagine sending a long letter to a friend. Instead of writing one huge letter, you cut it into smaller postcards, each with a destination address. You can send these postcards through different routes, and they may arrive in any order. Once all postcards reach the destination, they’re reassembled into the original letter. That’s packet switching!

Key Steps:

1. Segmentation: Large data is split into packets (small data blocks).
2. Addressing: Each packet gets a header with source and destination IP addresses.
3. Routing: Packets travel through routers that forward them based on the destination address.
4. Reassembly: At the destination, packets are reordered and reassembled into the original data.

Why It Matters:

• Efficient use of network paths.
• Robustness: If one route fails, packets can take alternative paths.
• Scalability: Supports many users sharing the same network.

📊 Packet Switching vs. Circuit Switching

💡 Exam Tip: Packet Switching

• Remember the four main steps: Segmentation, Addressing, Routing, Reassembly. • Use the postcard analogy to explain why packets can take different routes. • Highlight the benefits: efficiency, robustness, scalability. • Compare with circuit switching using the table above. • Practice drawing a simple network diagram with routers and packets.