Which two characteristics are associated with 802.1s? (Choose two)
A.
802.1s supports up to 1024 instances of 802.1
B.
802.1s is a Cisco enhancement to 802.1w.
C.
802.1s provides for faster convergence over 802.1D and PVST+.
D.
CPU and memory requirements are the highest of all spanning-tree STP implementations.
E.
802.1s maps multiple VLANs to the same spanning-tree instance.
The Answer Is:
C, E
This question includes an explanation.
Explanation:
C (Faster convergence): 802.1s (Multiple Spanning Tree Protocol – MSTP) improves convergence times over legacy 802.1D (STP) and PVST+ by leveraging the rapid convergence benefits of 802.1w (RSTP).
E (Maps multiple VLANs): MST allows multiple VLANs to share the same spanning-tree instance, reducing the overall number of instances required and improving scalability.
Other options explained:
A: The standard supports 64 MST instances, not 1024.
B: 802.1w (RSTP) is the basis for 802.1s; Cisco’s proprietary enhancement was originally PVST+.
D: MST actually reduces CPU/memory compared to running multiple instances of PVST+.
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