LAN / WLAN – Definition, Use Cases and Best Practices at a Glance
Local Area Network – a local network connecting devices in an office or building. WLAN is the wireless variant over Wi-Fi.
What is LAN/WLAN? Networks Explained
LAN and WLAN are the invisible foundation of every business. Without a stable, performant network, cloud apps, VoIP and video calls don’t work. With Wi-Fi 6E/7 and modern management, WLANs now reach speeds that used to require cables.
This glossary entry for LAN / WLAN gives you a clear Definition, practical Use Cases and Best Practices at a glance – with examples, pros and cons, and FAQs.
What is LAN / WLAN?
- LAN / WLAN – Local Area Network – a local network connecting devices in an office or building. WLAN is the wireless variant over Wi-Fi.
A LAN (Local Area Network) connects devices (PCs, printers, servers, IoT) within a limited area (office, building, campus). Ethernet (IEEE 802.3) is the standard for wired LANs (1–100 Gbit/s). WLAN (Wireless LAN) uses radio (IEEE 802.11, Wi-Fi). Current standards: Wi-Fi 6 (802.11ax, up to 9.6 Gbit/s theoretical), Wi-Fi 6E (6 GHz), Wi-Fi 7 (802.11be, up to 46 Gbit/s).
Switches connect wired devices; access points provide WLAN; routers connect the LAN to the internet.
How does LAN / WLAN work?
In a LAN, devices communicate over Ethernet. Each has a MAC address and an IP. Switches learn MACs and forward frames. VLANs split one physical network into logical segments (e.g. guest, staff, servers). DHCP assigns IPs; DNS resolves names. WPA3 encrypts WLAN. Enterprise WLANs often use 802.1X with certificates or a RADIUS server.
Practical Examples
Office network: 50 desks on Gigabit Ethernet, APs for WLAN, VLANs for staff and guests, firewall to the internet.
Enterprise WLAN: Hundreds of APs in a building, central controller, seamless roaming between floors.
Home office: Wi-Fi 6 router, mesh for coverage, VPN to the company network.
Factory: Industrial APs (dust/moisture resistant) for IoT sensors and mobile scanners.
Typical Use Cases
Office: Connect all workstations, printers and servers
Guest Wi-Fi: Separate network for visitors, internet only
VoIP and video: Stable link with QoS for calls and meetings
IoT: Wi-Fi for sensors, cameras and building automation
Remote work: VPN from home over Wi-Fi to the company network
Advantages and Disadvantages
Advantages
- Wired LAN: Highest speed and reliability (up to 100 Gbit/s)
- WLAN: Mobility and flexible layout
- VLANs: Segmentation without extra hardware
- Wi-Fi 6/7: Multi-gigabit wireless
- Central management for large networks
Disadvantages
- WLAN: Interference (microwave, Bluetooth, neighbouring networks, walls)
- Security: Open or weak WLAN is an entry point for attackers
- Shared medium: WLAN bandwidth is shared among users
- Cabling: Running cables in existing buildings can be costly
- Coverage: Large buildings may need many APs
Frequently Asked Questions about LAN / WLAN
Ethernet or WLAN for workstations?
Ethernet for fixed desks with high bandwidth (dev, design, video) – more reliable and secure. WLAN for mobile staff, meeting rooms and hot-desking. Ideal: both – Ethernet at each desk, WLAN everywhere.
How do I secure company WLAN?
WPA3-Enterprise with 802.1X and RADIUS. Separate SSIDs for staff (network access) and guests (internet only). VLANs so guest traffic cannot reach internal resources. Keep AP firmware updated. Consider wireless intrusion detection. MAC filtering alone is not enough.
What does enterprise WLAN cost?
Enterprise APs: about €200–500 each (e.g. UniFi, Aruba Instant On). For 200 m²: 2–4 APs, roughly €600–2,000. Controller: €500–5,000 or cloud (e.g. Meraki from about €150/AP/year). Design, install and config: €2,000–10,000 depending on size. Ongoing: updates, monitoring and occasional optimization.
Direct next steps
If you want to apply or evaluate LAN / WLAN in a real project, start with these transactional pages:
LAN / WLAN in the Context of Modern IT Projects
This page provides a concise definition of LAN / WLAN, practical use cases and best practices at a glance — everything you need to evaluate the technology for your next project. LAN / WLAN falls within the domain of Infrastructure and plays a significant role across a wide range of IT projects. When evaluating whether LAN / WLAN is the right fit, organizations should look beyond the technical merits and consider factors such as existing team expertise, current infrastructure, long-term maintainability, and total cost of ownership.
Drawing on our experience from over 250 software projects, we have found that correctly positioning a technology or methodology within the broader project context often matters more than its isolated strengths.
At Groenewold IT Solutions, we have worked with LAN / WLAN across multiple client engagements and understand both its advantages and the typical challenges that arise during adoption. If you are unsure whether LAN / WLAN suits your particular requirements, we are happy to provide an honest, no-obligation assessment. We analyze your specific situation and recommend the approach that delivers the most value — even if that means suggesting an alternative solution.
For more terms in the area of Infrastructure and related topics, see our IT Glossary. For concrete applications, costs, and processes we recommend our service pages and topic pages — there you will find many of the concepts explained here put into practice.
Related Terms
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