Access Point
A networking hardware device that allows other Wi-Fi devices to connect to a wired network. An access point acts as a central transmitter and receiver of wireless radio signals, creating a wireless local area network (WLAN). It is commonly used in homes, offices, and public hotspots to provide wireless internet access.
Late 1990s
2
Definitions
In Wireless Networking
An Access Point (AP) is a networking device that creates a Wireless Local Area Network (WLAN), typically in an office or large building. An AP connects to a wired router, switch, or hub via an Ethernet cable and projects a Wi-Fi signal to a designated area.
Key Concepts:
- Bridge Function: Its primary role is to act as a bridge, translating data from the wireless standard (IEEE 802.11) to the wired standard (IEEE 802.3 Ethernet) and vice versa.
- SSID (Service Set Identifier): An AP broadcasts a network name, known as the SSID, which wireless devices use to identify and connect to the network. A single physical network can have multiple APs broadcasting the same SSID to provide seamless roaming.
- Channels: To avoid interference, multiple APs in the same vicinity are configured to operate on different radio channels.
Usage Example: In a large office building, multiple Wireless Access Points are strategically placed on different floors and connected to the central network switch. This ensures that employees have strong and consistent Wi-Fi coverage regardless of their location within the building. The entire system is managed by a WLAN controller, which coordinates the APs.
As a Feature in Consumer Devices
Many consumer-grade networking devices, such as wireless routers and range extenders, have a built-in Access Point mode. This feature allows a device that normally performs routing functions to be reconfigured to act purely as a WAP.
Key Concepts:
- Router vs. AP Mode: In its default 'Router Mode,' a device manages the network (DHCP, NAT, Firewall). When switched to 'Access Point Mode,' these routing functions are disabled. The device simply extends an existing wired network by providing a wireless connection point, receiving its IP address and network instructions from the main router.
- Use Case: This is useful when you already have a primary router but need to extend your Wi-Fi coverage to another part of your home. You can run an Ethernet cable from your main router to an old router, switch it to AP mode, and use it to create a new Wi-Fi hotspot without creating a conflicting second network.
Example: You have a powerful main router in your living room, but the Wi-Fi signal is weak in your home office. You can take a spare wireless router, configure it to 'Access Point Mode,' and connect it via an Ethernet cable to the main router. This provides a strong, stable wireless connection in the office that is part of the same network.
Origin & History
Etymology
The term is a straightforward combination of 'access,' meaning the ability to approach or enter a place, and 'point,' referring to a specific location or node in a network. It literally describes a point where wireless devices can gain access to a network.
Historical Context
The concept of the **Access Point** emerged with the development of wireless local area network (WLAN) technology. In the late 1980s and early 1990s, precursor technologies like WaveLAN offered wireless connectivity but were proprietary and expensive. The pivotal moment came in 1997 with the release of the IEEE 802.11 standard, which laid the foundation for interoperable Wi-Fi devices. The term **Wireless Access Point** (or **WAP**) became common to describe the hardware that bridged these new 802.11 devices to existing Ethernet networks. Early **APs** were standalone devices primarily used in corporate environments. As Wi-Fi became popular in homes in the early 2000s, manufacturers began integrating **Access Point** functionality into routers, creating the all-in-one wireless routers we commonly use today. Despite this integration, standalone **Access Points** remain crucial for expanding network coverage in larger areas like offices, campuses, and public venues.
Usage Examples
To improve the Wi-Fi signal in the basement, we installed an additional Access Point connected to the main router via an Ethernet cable.
The conference hall is equipped with multiple Wireless Access Points to handle the high density of users connecting to the network.
Our IT department is upgrading the old WAP to a new Wi-Fi 6 model for faster speeds and better security.
Frequently Asked Questions
What is the primary difference between a wireless router and an access point?
A wireless router is a combination device that typically includes a router, a network switch, and a wireless access point. It manages the local network, assigns IP addresses (DHCP), and provides a firewall. An Access Point is a simpler device; its sole purpose is to provide wireless access to an existing wired network. It bridges wireless traffic to the wired LAN but doesn't perform routing or IP address management itself. Think of a router as the brain of the network and an AP as an antenna extending its reach.