Learn about Extended Service Sets (ESSs) in WLANs and how they expand coverage by combining multiple Basic Service Sets (BSSs) that share the same SSID.
Table of Contents
Question
Which of the following statements about the ESS is true?
A. ESSs are basic WLAN units.
B. The ESS identifies an AP.
C. BSSs in an ESS can have different SSIDs.
D. The ESS is composed of BSSs as basic units and is a method of expanding the BSS range.
Answer
D. The ESS is composed of BSSs as basic units and is a method of expanding the BSS range.
Explanation
An Extended Service Set (ESS) is a wireless LAN configuration that allows extending the coverage area of a WLAN by combining multiple Basic Service Sets (BSSs). A BSS is the basic building block of a WLAN, consisting of a single access point (AP) together with all its associated wireless client devices.
Some key points about ESSs:
- An ESS is formed by linking multiple BSSs together through a wired Ethernet backbone (called a Distribution System).
- All the BSSs in an ESS must use the same SSID (network name) and security settings.
- Wireless client devices can roam seamlessly between APs in different BSSs within the same ESS while maintaining connectivity.
- ESSs allow scaling up WLAN deployments to cover larger areas like office buildings, campuses, etc.
So in summary, ESSs build upon BSSs as the fundamental WLAN units to create an extended, roaming-enabled wireless network under a single SSID. The other options are incorrect because ESSs are not basic WLAN units themselves, do not identify individual APs, and cannot have different SSIDs across the component BSSs.
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