Cisco CCNA WLAN Architectures and Concepts 5

Question 1

What distinguishes WPA3-Personal from WPA2-Personal in terms of key exchange?

Accepted Answer

WPA3 uses Simultaneous Authentication of Equals (SAE) instead of PSK

Answer

WPA3-Personal uses SAE (Simultaneous Authentication of Equals), also known as Dragonfly, which provides forward secrecy and resistance to offline dictionary attacks.

Question 2

A Cisco AP is configured in 'sniffer mode.' What is the primary function of this mode?

Accepted Answer

Capturing all 802.11 traffic on a channel and forwarding it to a packet analyzer like Wireshark

Answer

Sniffer mode causes the AP to capture raw 802.11 frames on a specified channel and forward them to a remote packet capture tool such as Wireshark for analysis.

Question 3

Which mechanism does 802.11 use to avoid collisions in the wireless medium since CSMA/CD cannot be used?

Accepted Answer

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)

Answer

Wi-Fi uses CSMA/CA where devices sense the medium and use random backoff timers to avoid collisions, since collisions cannot be detected in wireless environments.

Question 4

In a Cisco WLC high availability (HA) pair, what is the role of the 'secondary' WLC when the primary is active?

Accepted Answer

The secondary maintains a warm standby, ready to take over all APs if the primary fails

Answer

In Cisco WLC HA, the secondary controller stays in a warm standby state, synchronizing state with the primary and ready to assume all AP connections upon primary failure.

Question 5

What is a 'hidden node problem' in wireless networking, and what mechanism addresses it?

Accepted Answer

Two clients that cannot hear each other but both transmit to the same AP causing collisions; addressed by RTS/CTS

Answer

The hidden node problem occurs when two clients can't detect each other's transmissions but share the same AP; RTS/CTS handshaking reserves the medium to prevent collisions.

Cisco CCNA Practice Test

Cisco CCNA Practice Test

Cisco CCNA WLAN Architectures and Concepts 5