802 Standards

Question 1

802.1Q

Answer 1

Dot1q / VLAN Tagging / Supporting multiple VLANs on a single trunk link

Question 2

802.1X

Answer 2

PNAC / Port-based Auth / The “Bouncer” that requires a password to open a port

Question 3

802.1d

Answer 3

Classic STP / Spanning Tree / Preventing Layer 2 loops (30-50s convergence)

Question 4

802.1w

Answer 4

Rapid STP (RSTP) / Fast Spanning Tree / Faster loop prevention (under 2s convergence)

Question 5

802.3

Answer 5

Ethernet / Wired Standard / The base rules for frames moving over copper/fiber

Question 6

802.3af

Answer 6

PoE / Power over Ethernet / Delivering up to 15.4W to a device

Question 7

802.3at

Answer 7

PoE+ / Power over Ethernet Plus / Delivering up to 30W (for PTZ cameras/high-end APs)

Question 8

802.3bt

Answer 8

4PPoE / Type 3 & 4 PoE / High power (60W-100W) for laptops and LED lighting

Question 9

802.3ad

Answer 9

LACP / Link Aggregation / Bundling physical ports into a single logical channel

Question 10

802.11

Answer 10

Wi-Fi / Wireless LAN / The foundation for all wireless networking

Question 11

802.11a

Answer 11

Wireless-A / 5 GHz / Legacy 54 Mbps wireless (Short range)

Question 12

802.11b

Answer 12

Wireless-B / 2.4 GHz / Legacy 11 Mbps wireless (High interference)

Question 13

802.11g

Answer 13

Wireless-G / 2.4 GHz / 54 Mbps wireless (Backward compatible with B)

Question 14

802.11n

Answer 14

Wi-Fi 4 / 2.4 & 5 GHz / 600 Mbps; introduced MIMO technology

Question 15

802.11ac

Answer 15

Wi-Fi 5 / 5 GHz only / 6.9 Gbps; introduced MU-MIMO and beamforming

Question 16

802.11ax

Answer 16

Wi-Fi 6 / 2.4, 5, & 6 GHz / High-efficiency wireless for dense environments

Question 17

802.15

Answer 17

Bluetooth / WPAN / Wireless Personal Area Network (Short range)

Question 18

802.15.4

Answer 18

Zigbee / Low-power wireless / Used for IoT sensors and smart home devices

Question 19

802.16

Answer 19

WiMAX / Wireless MAN / Broadband wireless for cities (Long range)