Which is the default STP operation mode on Cisco Catalyst switches?
- RSTP
- PVST+
- MST
- MSTP
- Rapid PVST+
Explanation: Cisco switches running IOS 15.0 or later run PVST+ by default. Cisco Catalyst switches support PVST+, Rapid PVST+, and MSTP. However, only one version can be active at any time.
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