Cisco CCNA mock exam questions sample test – Question 382

.What is the Institute of Electrical and Electronics Engineers (IEEE) specification for Spanning Tree Protocol (STP)?

A. 802.1d
B. 802.1q
C. 802.3u
D. 802.3z

Correct Answer: A

The IEEE specification for STP is 802.1d. STP uses the spanning-tree algorithm to find and prevent loops in redundant network topologies. This helps mitigate broadcast storms,
multiple copies of frames, and Media Access Control (MAC) address database inconsistencies.
The IEEE committee developed the 802.1 series of specifications for bridging. The IEEE 802.1q specification is for Virtual LAN (VLAN) trunking. Per this specification, a 4-byte 802.q
header, which contains the Priority and VLAN ID fields, is inserted in the middle of the original Ethernet header.
802.3 is the IEEE committee specification that defines the Ethernet group. Ethernet is a LAN protocol that specifies physical layer and MAC sublayer media access. IEEE 802.3 uses
carrier sense multiple access collision detect (CSMA/CD) to provide access for many devices on the same network. 802.3u is the IEEE specification for Fast Ethernet. 802.3z is the
IEEE specification for Gigabit Ethernet.
LAN Switching Fundamentals
Configure, verify, and troubleshoot STP protocols
Cisco > Support > Configuring Spanning Tree-Protocol > How STP Works