CCDE: Cisco Certified Design Expert (Practical) — Question 176

Company XYZ wants to prevent switch loops caused by unidirectional point-point-link condition on Rapid PVST + and MST. Which technology can be used in the design to meet this requirement?

Answer options

• A. STP BPDU guard
• B. STP bridge assurance
• C. MSTP
• D. TRILL

Correct answer: B

Explanation

STP bridge assurance is specifically designed to prevent loops that can occur from unidirectional links, thus making it the correct choice. STP BPDU guard protects against erroneous BPDU messages, MSTP is a protocol for multiple spanning trees but does not inherently protect against unidirectional links, and TRILL is a routing protocol that does not directly address this specific loop prevention issue.