mediumMultiple Choice
350-401 Practice Question: Interface GigabitEthernet0/2 spanning-tree…
interface GigabitEthernet0/2 spanning-tree link-type point-to-point
end
What is the effect of this configuration?
⚠ Common exam trap
Many candidates confuse the `spanning-tree link-type point-to-point` command with disabling STP or forcing a designated port, when in reality it only influences the RSTP fast transition behavior based on the perceived link type.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The port will use RSTP fast transition mechanisms assuming a point-to-point link.
The `spanning-tree link-type point-to-point` command manually overrides the port's link type to point-to-point, forcing the port to use Rapid Spanning Tree Protocol (RSTP) fast transition mechanisms (proposal/agreement handshake) instead of the slower 802.1D listening/learning states. This is correct because RSTP relies on the link type to determine whether it can safely perform a fast transition to the forwarding state; a point-to-point link allows immediate transition without waiting for timers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The port will use RSTP fast transition mechanisms assuming a point-to-point link.
Why this is correct
Setting the link type to point-to-point marks the switchport as a direct, full-duplex connection between exactly two switches, which lets Rapid Spanning Tree (RSTP/Rapid PVST+) invoke its proposal/agreement mechanism. Once the root port sends a proposal and receives agreement from the downstream designated port, the port can enter the forwarding state immediately instead of waiting through the default 15-second listening and 15-second learning timers. This fast transition is the key benefit of RSTP over classic 802.1D STP and is only used when the link is treated as point-to-point.
- ✗
The port will become a designated port immediately.
Why it's wrong here
Port role selection in STP/RSTP is determined by the spanning-tree algorithm comparing bridge IDs, path costs, and received BPDUs; configuring link-type point-to-point changes none of those values. The port can become root, designated, alternate, or backup depending on the topology, but this configuration only influences how quickly a port transitions when it is already the correct role. Therefore the switchport will not immediately become designated simply because the link type was set.
- ✗
The port will disable STP on that link.
Why it's wrong here
The spanning-tree link-type command does not turn off Spanning Tree Protocol processing on the interface; BPDUs are still sent and received, and STP state machines remain active. It only tells RSTP which transition mechanism to use on that segment. To truly disable STP you would need a global or per-VLAN shutdown command, such as 'no spanning-tree vlan' — not a link-type setting.
- ✗
The port will use shared medium behavior.
Why it's wrong here
A point-to-point link is the opposite of a shared medium: shared behavior models a legacy hub segment, where RSTP cannot use the proposal/agreement fast handshake because there may be more than two bridges contending for the same collision domain. On shared or half-duplex links, RSTP must fall back to the classic 802.1D waiting periods (max age, forward delay). Since the user specified point-to-point, the switch assumes a direct two-bridge segment and will not degrade to shared-medium behavior.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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