Wired and wireless LAN infrastructure is the network inside a building or campus: the structured cabling, the switches that devices plug into, the Wi-Fi access points, and the software that manages them, controls who can connect and keeps traffic separated. It is what connects laptops, phones, printers, cameras, badge readers and other devices to each other and to the internet or wide area network.
At a glance
- The wired side is cabling and switches; the wireless side is Wi-Fi access points and their management.
- Switches often power access points, phones and cameras through Power over Ethernet (PoE).
- Access control (such as 802.1X) and segmentation (such as VLANs) keep users and devices in the right part of the network.
- Management can be cloud-based or on-premises, and is usually licensed per device.
- Refreshes are driven by end of support, new Wi-Fi standards, growth and security needs.
What problem it solves
Everything at a site depends on the local network. When Wi-Fi is weak in conference rooms, switches are out of support, or cameras and guest devices share a network with finance systems, the result is slow work, help desk tickets and security exposure. Older networks also tend to be configured differently at each site, so every problem has to be diagnosed from scratch.
A well-designed LAN gives reliable connections where people actually work, enough capacity for the number of devices, power for the equipment that needs it, and separation between kinds of users and devices. Standard designs and central management make sites consistent and easier to support.
How it works
Cabling. Copper Ethernet cabling runs from access switches to wall jacks, access points and devices; fiber usually connects closets and buildings. Cable category and length limits affect speeds and PoE delivery.
Switching. Access switches connect end devices and often provide PoE. Distribution or core switches connect access switches together and to routers, firewalls and the WAN. Redundant uplinks and switch stacking or similar designs keep a single failure from taking down a floor.
Wi-Fi. Access points are placed based on a wireless survey that considers walls, materials, device density and interference. Current standards include Wi-Fi 6, Wi-Fi 6E (which adds the 6 GHz band) and Wi-Fi 7; which bands and features are available depends on country, device support and equipment. See wireless local area network (WLAN) for more on the wireless side.
Access control and segmentation. 802.1X authentication checks users or devices before they join; MAC authentication bypass (MAB) handles devices that can’t do 802.1X, such as some printers and IoT devices. Network access control (NAC) tools apply policies. VLANs, and in larger designs VRFs, keep guest, corporate, voice, camera and IoT traffic separate so a problem in one area doesn’t spread.
Management and monitoring. Cloud-managed or controller-based platforms push configurations, update firmware and show client and device health. Some include troubleshooting analytics. Licensing models vary by vendor, and some cloud-managed equipment stops working fully if licenses lapse, so read the terms.
Cellular coverage indoors is a separate system; see distributed antenna system (DAS). For design and sourcing, see our LAN infrastructure page.
When it matters for buyers
- When opening or moving offices. Cabling, power and access point placement are cheapest to get right before move-in.
- When equipment reaches end of support. Unsupported switches and access points stop receiving security fixes.
- When device counts grow. IoT, cameras and video meetings add load that older designs didn’t plan for.
- When audits or cyber insurance ask about segmentation. A flat network is a common finding.
- When deciding whether to run it yourself. Managed network services and managed Wi-Fi shift operations to a provider.
Questions to ask vendors
- Will you perform a wireless survey before design, and a validation survey after installation?
- What is the PoE budget per switch, and does it cover everything we plan to connect?
- How is the management platform licensed, and what happens if a license lapses?
- What are the end-of-sale and end-of-support dates for the equipment you’re proposing?
- How will you handle 802.1X, guest access and IoT devices that can’t authenticate?
- What redundancy is included at the core and for uplinks?
- Who supports the network after installation, and what are the response times?
Problems this helps with
- Wi-Fi that drops or slows down in busy areas
- Switches and access points reaching end of life
- Cameras, phones and IoT devices on the same network as everything else
- Moving into a new office and needing the network ready on day one
