Suggest an editImprove this articleRefine the answer for “What does the term "network topology" mean?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Network topology** is the way network devices (nodes) and the connections between them are organized and arranged; it describes how devices are connected and along which paths data travels through the network. **Key point:** physical topology (how cables are actually laid) and logical topology (how traffic is actually transmitted) are distinguished, and interviews often ask about exactly this difference.Shown above the full answer for quick recall.Answer (EN)Image**Network topology** is the *way network devices (nodes) and the connections between them are organized and arranged*. Put simply: > **Network topology describes how devices are connected and along which paths data travels through the network.** This is one of the basic networking terms, and it shows the **structure**, the **logic of connections**, and the **characteristics of data transmission**. --- ## Why is topology needed? Topology lets you understand: - **how devices are physically connected** - **how data exchange is organized** - **where bottlenecks are possible** - **how the network will behave during failures** - **how to scale it** Administrators use topologies for: - designing a new network, - troubleshooting, - assessing load, - choosing optimal equipment. --- ## Types of network topology ### 1. Physical topology Describes *how cables are actually laid and how equipment is arranged*. Example: cables from all PCs go to a single switch → a physical "star". ### 2. Logical topology Describes *how traffic is actually transmitted* between devices, even if the physical structure is different. Example: In Ethernet the physical topology is a "star", but logically devices operate on a "shared bus" (broadcast domain). **Important:** Interviews often ask about the difference between the two. --- ## Main topology types (classic) ### 1. "Bus" topology All devices are connected to a single shared channel. Historical (Ethernet 10BASE2/5), now almost never used. Pros: simple, cheap. Cons: one cable damage breaks the whole network; collisions. --- ### 2. "Star" topology - the most common today All devices connect to a central device (a switch). Pros: - a failure of one PC does not affect the others - easy to expand - high performance Cons: a switch failure → the network becomes unavailable. --- ### 3. "Ring" topology Devices are connected in a circle. Used in Token Ring, FDDI. Now almost never applied. Pros: no collisions. Cons: a break in the ring = problems. --- ### 4. "Mesh" topology Each device is connected to many others. Full mesh - when every device connects to every other. Partial mesh - when only critical nodes have multiple connections. Pros: - high fault tolerance - excellent bandwidth Cons: expensive and hard to scale. --- ### 5. "Tree" topology A hierarchy of switches: root → distribution → access. This is the basis of modern corporate LANs. Pros: - scalability - structure Cons: - dependency on the upper levels of the tree --- ## Examples of topologies in real life - **Home network** - usually a "star": all devices → a home router. - **Offices** - a tree topology with multiple switches. - **Data centers** - Clos/Fat-Tree (variations of tree and mesh). - **Wireless mesh networks** - Wi-Fi Mesh at home or in large venues. --- ## How to answer in an interview (short and clear) > **Network topology is the way connections between devices are organized and the path traffic takes.** > **Physical and logical topology are distinguished.** > **Main types: bus, star, ring, tree, and mesh.** > **In practice, the star topology and tree structures are used most often.** --- ## Cheat sheet - Topology = network structure: how devices are connected. - There is a **physical** and a **logical** one. - Types: **bus**, **star**, **ring**, **mesh**, **tree**. - In a modern LAN, mostly **star** and **tree/Clos**.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.