What does a wireless LAN (WLAN) act as to a wired network? a. Gateway
b. Bridge
c. Switch
d. Router

The answer is option A "Gateway"

Explanation:

A wireless LAN (WLAN) connects at least two computers or devices using some wireless distribution technique (normally spread-spectrum or OFDM radio), and as a rule gives a connection through a gateway/modem to the more extensive Web. This gives clients the portability to move around through a local coverage and still be connected with the network.

Wireless LANs have gotten famous in the home because of simplicity of establishment, the expanding ubiquity of PC and hand-held PCs, and commonality, due the accessibility of (frequently free) wireless network on schools and in open organizations.

A WLAN, or wireless LAN, is a network that permits gadgets to connect and communicate wirelessly. Dissimilar to a traditional wired LAN, in which gadgets communicate over Ethernet links, devices on a WLAN connects by means of Wi-Fi. They can speak with different gadgets on the network a similar way they would on a wired network.

The essential contrast is the way the information is communicated. In a LAN, information is communicated over actual links or cables in a progression of Ethernet packets. In a WLAN, bundles are communicated over the air.