Basics and Concepts Flashcards
7 cards from real STP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basics and Concepts flashcards as text
Which STP port state forwards data frames AND learns MAC addresses?
Answer: Forwarding
Only the Forwarding state both learns MAC addresses and forwards data frames across the network.
What is the default STP bridge priority value on a Cisco switch?
Answer: 32768
Cisco switches default to a bridge priority of 32768, which is the midpoint of the 0–65535 range.
Which field in the Bridge ID is used to differentiate switches with the same base priority?
Answer: MAC address
When bridge priorities are equal, the lowest MAC address breaks the tie to elect the root bridge.
What happens to a non-root switch port that receives a superior BPDU?
Answer: It becomes a root port
A port that receives the best BPDU from the root bridge direction becomes the root port for that switch.
What is the STP port cost for a 1 Gbps link using the original IEEE cost values?
Answer: 4
The original IEEE 802.1D cost for a 1 Gbps link is 4, based on the formula 1000/bandwidth in Mbps.
Which STP timer controls how long a port waits in the Listening and Learning states?
Answer: Forward delay
The forward delay timer (default 15 seconds) determines the duration spent in each of the Listening and Learning states.
In STP, what is the role of a designated port on a network segment?
Answer: It is the single forwarding port on each segment
Each LAN segment has exactly one designated port, which is the forwarding port responsible for that segment's traffic toward the root.