Which two of the following statements are true with respect to STP in this network? (Choose 2)

Question

Options

• ABoth 5k's have BPDU Guard and BPDU Filter enabled by default, while both 7k's do not
• BBoth 5k's bridge Assurance enabled, while both 7k's do not
• C7k's is the root bridge for VLANs 100-150
• DBoth 7K-3 and 7k-4 being vPC peers, are the root bridge for VLANs 100-150
• ENo devices have a root cost higher than 1, since all devices are no more that 1 hop away from

• A
  11% (5)
• B
  17% (8)
• C
  4% (2)
• D
  68% (32)

Explanation

In a vPC (Virtual Port Channel) topology, both vPC peer switches (7K-3 and 7K-4) present a unified STP identity to downstream devices. They share the same bridge ID, so both peers effectively act as the root bridge together - neither downstream switch sees them as separate STP participants. This makes D correct. For E: since all other switches (e.g., the 5Ks) connect directly to the vPC peer devices (the root), they are exactly 1 hop away. Their root path cost equals the cost of that single uplink - no device accumulates cost across multiple hops, so no device has a root cost higher than a single link's cost. Options A and B are incorrect because on Nexus platforms, Bridge Assurance is enabled by default on network (trunk) ports for both 5K and 7K series - it is not exclusive to 5Ks. Option C is incorrect because it refers to a single '7k's' as root, ignoring the vPC peer relationship described in D.

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