Wireless Technologies & Network Fundamentals Flashcards

Which IEEE 802.11 amendment introduced OFDMA as a key feature to improve multi-user efficiency?

Answer: 802.11ax

802.11ax (Wi-Fi 6) introduced OFDMA, allowing simultaneous transmissions to multiple clients by dividing channels into resource units.

What is the primary purpose of a Distributed Antenna System (DAS) in wireless networking?

Answer: Extend coverage in large or obstructed venues

A DAS distributes antenna nodes throughout a building or venue to provide consistent wireless coverage in areas where a single AP would struggle.

In the context of 802.11 networks, what does the term 'BSS' stand for?

Answer: Basic Service Set

BSS (Basic Service Set) is the fundamental building block of an 802.11 WLAN, consisting of an AP and its associated client stations.

Which frequency band is exclusively used by 802.11ad (WiGig) for very short-range, high-throughput communications?

Answer: 60 GHz

802.11ad operates in the 60 GHz band, enabling multi-gigabit speeds over very short distances with limited wall penetration.

What is the role of the Distribution System (DS) in an infrastructure-mode WLAN?

Answer: Connects access points to each other and to wired networks

The Distribution System interconnects APs and bridges wireless traffic to the wired LAN, enabling roaming and inter-AP communication.

Which modulation scheme offers the highest data rate in the 802.11ax (Wi-Fi 6) standard?

Answer: 1024-QAM

Wi-Fi 6 (802.11ax) uses 1024-QAM as its highest modulation, encoding 10 bits per symbol for maximum throughput.

A wireless client fails to roam smoothly between APs despite being in range of both. Which feature, when enabled, most directly improves this behavior?

Answer: 802.11r Fast BSS Transition

802.11r (Fast BSS Transition) pre-authenticates clients with neighboring APs, drastically reducing roaming latency.