Wireless LANs (WLANs) have become an integral part of modern networking. Which of the following statements about WLANs are correct? (Select all that apply.)
Correct Answer: A,B,C,E
Detailed Explanation: Wireless LANs (WLANs) have revolutionized the way networks are designed and accessed, providing flexibility and mobility that are not possible with traditional wired connections. One of the key features of WLANs is their operation in unlicensed frequency bands—most commonly 2.4 GHz and 5 GHz (Option A). These frequency bands are available for use by a wide variety of wireless devices, allowing for widespread deployment of Wi-Fi networks without the need for expensive spectrum licensing. WLANs adhere to a set of standards established by the IEEE 802.11 working group (Option B). These standards define the protocols for wireless communication, including aspects such as frequency usage, data rates, and security measures. Over the years, multiple amendments (such as 802.11a, 802.11b, 802.11g, 802.11n, and 802.11ac) have been introduced to address the evolving demands for higher throughput, improved reliability, and enhanced security. This continuous evolution has made WLANs more capable and efficient, meeting the needs of modern network applications. One important concept in WLAN design is the use of Service Set Identifiers (SSIDs) (Option C). An SSID is a unique identifier assigned to a WLAN, enabling wireless devices to distinguish between multiple networks in the same physical area. This differentiation is crucial in environments such as office buildings, apartments, or public spaces where several wireless networks might be in operation concurrently. The SSID is typically broadcast by access points, making it visible to client devices and enabling users to connect to the desired network. WLANs rely on access points (APs) to provide the connection point between wireless devices and the wired network (Option E). Access points function as central hubs that manage wireless communications, authenticate clients, and relay data between the wireless network and the broader wired infrastructure. The deployment of multiple APs in a network, along with careful planning to avoid channel interference and overlapping coverage, is essential for ensuring robust wireless connectivity and optimal performance. Option D is incorrect because WLANs are not inherently more secure than wired networks. In fact, the broadcast nature of wireless communication can make WLANs more vulnerable to eavesdropping and unauthorized access if proper security measures are not implemented. While modern WLANs employ various encryption methods—such as WPA2 or WPA3—to enhance security, the security of a wireless network is highly dependent on its configuration and management. Without strong encryption and proper authentication mechanisms, a WLAN can be easily exploited by malicious actors. In summary, WLANs are a vital component of contemporary network infrastructure. They provide the convenience of mobility and flexible connectivity by operating in unlicensed frequency bands, adhering to IEEE 802.11 standards, using SSIDs for network identification, and relying on access points to manage wireless communications. However, while WLANs offer many benefits, they require vigilant security practices to mitigate the risks associated with wireless transmission.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.