OC1 Answer: 51.84 Mbps
STP Default Priority Answer: 32768
STP Selection
*Lowest BID
*Lowest Cost
*Lowest Senders Port # Answer: STP Selection
*Lowest BID
*Lowest Cost
*Lowest Senders Port #
Port states :
*Blocking : A port that would cause a switching loop i...
Question and Solution Paper CCNA 200-
301 2024/2025
OC1 Answer: 51.84 Mbps
STP Default Priority Answer: 32768
STP Selection
*Lowest BID
*Lowest Cost
*Lowest Senders Port # Answer: STP Selection
*Lowest BID
*Lowest Cost
*Lowest Senders Port #
Port states :
*Blocking : A port that would cause a switching loop if it were active. To prevent the use of looped
paths, no user data is sent or received over a blocking port. BPDU data is still received in blocking state.
A blocked port may go into forwarding mode if the other links in use fail and the spanning tree algorithm
determines the port may transition to the forwarding state.
*Listening : The switch processes BPDUs and awaits possible new information that would cause it to
return to the blocking state. It does not populate the MAC table and it does not forward frames.
*Learning : While the port does not yet forward frames, it does learn source addresses from frames
received and adds them to the MAC table.
,*Forwarding : A port in normal operation receiving and forwarding frames. The port monitors incoming
BPDUs that would indicate it should return to the blocking state to prevent a loop.
*Disabled : A Answer: Port states :
*Blocking : A port that would cause a switching loop if it were active. To prevent the use of looped
paths, no user data is sent or received over a blocking port. BPDU data is still received in blocking state.
A blocked port may go into forwarding mode if the other links in use fail and the spanning tree algorithm
determines the port may transition to the forwarding state.
*Listening : The switch processes BPDUs and awaits possible new information that would cause it to
return to the blocking state. It does not populate the MAC table and it does not forward frames.
*Learning : While the port does not yet forward frames, it does learn source addresses from frames
received and adds them to the MAC table.
*Forwarding : A port in normal operation receiving and forwarding frames. The port monitors incoming
BPDUs that would indicate it should return to the blocking state to prevent a loop.
*Disabled : A network administrator has manually disabled the switch port.
STP Timers :
*Hello = 2 seconds
*MaxAge = 15 seconds
*Forward delay = 15 seconds Answer: STP Timers :
*Hello = 2 seconds
*MaxAge = 15 seconds
*Forward delay = 15 seconds
, STP State (802.1d)
*Listening
*Learning
*Forwarding
*Blocking
*Disabled Answer: RSTP State (802.1w)
*Not Used (*Discarding)
*Learning
*Forwarding
*Discarding
*Discarding
STP Roles (802.1d) :
*Root
*Designated Answer: RSTP State (802.1w) :
*Root
*Designated
*Alternate
*Backup
STP Default Port Cost : IEEE Cost (before 1999)
Bandwidth Short = Path Cost
*10 Mbps = 100
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