--- title: "Abdul Kareem (@alien15) | Hashnode" description: "Write What Matters. Build What’s Next. Read the latest articles by Abdul Kareem on Hashnode." url: "https://hashnode.com/@alien15" --- @alien15 # Abdul Kareem @alien15 · Joined August 2025 Write What Matters. Build What’s Next ### [🌐 Circuit Switching vs Packet Switching | CN#6](https://codebyalien.hashnode.dev/circuit-switching-vs-packet-switching-cn6?utm_source=hashnode&utm_medium=feed) In earlier posts, we covered network devices. Now let’s understand two fundamental techniques for data transfer in networks: Circuit Switching and Packet Switching. 🔹 Circuit Switching 📌 Key Points Works at the Physical Layer. Uses a dedicated p... 3 min read · [codebyalien.hashnode.dev](https://codebyalien.hashnode.dev/circuit-switching-vs-packet-switching-cn6?utm_source=hashnode&utm_medium=feed) [Sep 10, 2025](https://hashnode.com/posts/circuit-switching-vs-packet-switching-cn6/68c186e939ce74ac8a8f4a4b) ### [🌐 Networking Devices (Part 2) – Bridges, Switches, and Routers | CN#5](https://codebyalien.hashnode.dev/networking-devices-part-2-bridges-switches-and-routers-cn5?utm_source=hashnode&utm_medium=feed) Networking devices like bridges, switches, and routers analyze and direct data flow, enhancing modern network communication efficiency 4 min read · [codebyalien.hashnode.dev](https://codebyalien.hashnode.dev/networking-devices-part-2-bridges-switches-and-routers-cn5?utm_source=hashnode&utm_medium=feed) [Aug 24, 2025](https://hashnode.com/posts/networking-devices-part-2-bridges-switches-and-routers-cn5/68aadc672d592d08e110b68a) ### [🌐 CN-4: Networking Devices & Cables (Part 1)](https://codebyalien.hashnode.dev/cn-4-networking-devices-and-cables-part-1?utm_source=hashnode&utm_medium=feed) 1️⃣ Introduction Before diving into advanced devices, let’s understand the building blocks of networks — the cables that carry signals and the simple devices that connect them. 2️⃣ Cables in Networking 🔌 Unshielded Twisted Pair (UTP) Cable Commonly... 3 min read · [codebyalien.hashnode.dev](https://codebyalien.hashnode.dev/cn-4-networking-devices-and-cables-part-1?utm_source=hashnode&utm_medium=feed) [Aug 21, 2025](https://hashnode.com/posts/cn-4-networking-devices-and-cables-part-1/68a72ab844b9c2325039e2ba) ### [🔗 Network Topologies Explained: Mesh, Star, Bus, and Ring | CN #3](https://codebyalien.hashnode.dev/network-topologies-explained-mesh-star-bus-and-ring-cn-3?utm_source=hashnode&utm_medium=feed) 🧠 Introduction In networking, topology defines how devices (nodes) are physically or logically connected to each other. Choosing the right topology impacts cost, reliability, performance, and scalability. In this post, we’ll explore four important t... 2 min read · [codebyalien.hashnode.dev](https://codebyalien.hashnode.dev/network-topologies-explained-mesh-star-bus-and-ring-cn-3?utm_source=hashnode&utm_medium=feed) [Aug 18, 2025](https://hashnode.com/posts/network-topologies-explained-mesh-star-bus-and-ring-cn-3/68a34b726beab4664baadfd8) ### [📡 PAN, LAN, CAN, MAN, WAN Explained — Types of Computer Networks | CN #2](https://codebyalien.hashnode.dev/pan-lan-can-man-wan-explained-types-of-computer-networks-cn-2?utm_source=hashnode&utm_medium=feed) #computer-networks #cn #network-types #pan #lan #wan #csfundamentals ✍️ Intro Paragraph When we connect devices to share data — from Bluetooth headphones to the global internet — we’re using different types of computer networks. In this post, we’ll ... 2 min read · [codebyalien.hashnode.dev](https://codebyalien.hashnode.dev/pan-lan-can-man-wan-explained-types-of-computer-networks-cn-2?utm_source=hashnode&utm_medium=feed) [Aug 7, 2025](https://hashnode.com/posts/pan-lan-can-man-wan-explained-types-of-computer-networks-cn-2/6894e35a9637736c48e75847)