CCIE Enterprise Wireless Flashcards

Which protocol is used for centralized AAA authentication in Cisco wireless deployments?

Answer: RADIUS

RADIUS is the standard protocol used for AAA (Authentication, Authorization, Accounting) in wireless deployments, including 802.1X authentication.

In 802.11 OFDMA (used in Wi-Fi 6), what are the sub-channel allocations called?

Answer: Resource Units (RUs)

OFDMA divides the channel into Resource Units (RUs), which are groups of subcarriers that can be allocated to different clients simultaneously.

What is the primary benefit of Target Wake Time (TWT) in 802.11ax for IoT devices?

Answer: Scheduled wake/sleep cycles for improved battery life

TWT allows APs to schedule specific wake times for clients, enabling IoT devices to sleep longer and significantly extend battery life.

Which Cisco wireless architecture mode requires the WLC to handle all client data traffic through the controller?

Answer: Local mode (centralized)

In Local (centralized) mode, all client data traffic is tunneled through CAPWAP to the WLC, which then forwards it to the network.

What does the Cisco Hyperlocation feature use to achieve sub-meter location accuracy?

Answer: Angle of Arrival (AoA) with dedicated antenna arrays

Cisco Hyperlocation uses Angle of Arrival (AoA) measurements from a specialized antenna module to achieve sub-meter location accuracy.

In WPA2/802.11i, what is the 4-way handshake used to derive?

Answer: Both PTK and GTK

The 4-way handshake derives both the PTK (unicast encryption key) and distributes the GTK (multicast/broadcast encryption key) between AP and client.