CCDE: Cisco Certified Design Expert (Practical) — Question 89

Which two characteristics are associated with 802.1s? (Choose two.)

Answer options

• A. 802.1s provides for faster convergence over 802.1D and PVST+
• B. 802.1s is a Cisco enhancement to 802.1w
• C. 802.1s supports up to 1024 instances of 802.1w
• D. 802.1s maps multiple VLANs to the same spanning-tree instance
• E. CPU and memory requirements are the highest of all spanning-tree STP implementations

Correct answer: A, D

Explanation

Option A is correct because 802.1s does indeed offer improved convergence times over 802.1D and PVST+. Option D is also correct as it allows multiple VLANs to map to one spanning-tree instance. Options B, C, and E are incorrect; B is misleading as 802.1s is not just a Cisco enhancement for 802.1w, C is incorrect as 802.1s does not support 1024 instances of 802.1w, and E is false as the CPU and memory requirements are not the highest among STP implementations.