802 Standards

Question 1

What is IEEE 802.1q

Answer 1

The standard defining a system of tagging VLAN frames for identification over a trunk, often referred to as Dot1q. Dot1q tagging adds 4 bytes (12 bits) to every VLAN Ethernet frame, except for native VLAN frames.

Question 2

What is IEEE 802.3af

Answer 2

The original Power over Ethernet (PoE) standard which provides up to 15.4 Watts of power to a device

Question 3

What is IEEE 802.3at

Answer 3

An update to the original Power over Ethernet (PoE) standard which provides up to 25.5 Watts of power to a device

Question 4

What is IEEE 802.3bt

Answer 4

The most recent Power over Ethernet (PoE) standard which can provide up to 100 Watts of power to a device

Question 5

What is IEEE 802.1ad

Answer 5

Link Aggregation Control Protocol (LACP) used to negotiate the automatic formation of EtherChannel.

Question 6

What is IEEE 802.1ab

Answer 6

Link Layer Discovery Protocol (LLDP) An open-standard Layer 2 neighbor discovery. LLDP-enabled devices use a variety of multicast MAC addresses for communication, all containing an OUI of 01-80-c2.

Question 7

What is IEEE 802.1s

Answer 7

Multiple Spanning Tree Protocol (MSTP) maps multiple VLANs into the same spanning tree instance, supporting up to 16 instances Rapid Spanning Tree Protocol (RSTP).

Question 8

Per-VLAN Spanning Tree (PVST+)

Answer 8

A Cisco enhancement of STP that provides a separate 802.1D spanning-tree instance for each VLAN on the network.

Question 9

Rapid Per-VLAN Spanning Tree (Rapid PVST+)

Answer 9

A Cisco enhancement of Rapid Spanning Tree Protocol (RSTP) which uses PVST+, and provides separate 802.1w RSTP instances for each VLAN on the network.

Question 10

What is IEEE 802.1w

Answer 10

Rapid Spanning Tree Protocol (RSTP) convergence issues found in the original STP implementation, with faster convergence when transitioning from blocking to forwarding states

Question 11

What is IEEE 802.1d

Answer 11

Spanning Tree Protocol (STP) A network protocol used to ensure a loop-free logical topology in Ethernet networks

Question 12

What is IEEE 802.11ac

Answer 12

An IEEE standard for wireless network communications that replaced the older 802.11n standard. 802.11ac operates ONLY in the 5 GHz frequency band with a maximum bandwidth of 3.5 Gbps.

Question 13

What is IEEE 802.11ax

Answer 13

An IEEE standard for wireless network communication designed to replace the older 802.11ac standard. 802.11ax 0perates in both the 2.4 GHz and 5 GHz frequency bands and has a maximum bandwidth of 9.6 Gbps. Introduced TWT

Question 14

What is IEEE 802.11n

Answer 14

An IEEE standard for wireless network communications which was replaced by the 802.11ac standard. 802.11n operates in both the 2.4 GHz and 5 GHz frequency bands with a maximum bandwidth of 150 Mbps. Introduced Beamforming

Question 15

What is IEEE 802.1p

Answer 15

The additional 4 bytes added to a frame in order to indicate a Layer 2 priority using a Class of Service (CoS) value.