352-001 Question #91: Real Exam Question with Answer & Explanation

Question

Options

• ATwo Resilient Ethernet Protocol segments can be connected redundantly at two points. One
• BUniDirectional Link Detection Protocol can be enabled on Resilient Ethernet Protocol interfaces
• CThe guaranteed convergence recovery time is less than 50 ms for the local segment.
• DA Resilient Ethernet Protocol segment is limited to a maximum of seven devices.
• EVLAN load balancing for optimal bandwidth usage is supported in any Resilient Ethernet Protocol

Explanation

REP (Resilient Ethernet Protocol) is a Cisco proprietary ring-topology protocol providing loop prevention and fast failover. Two key design considerations are: (B) UDLD (UniDirectional Link Detection) can and should be enabled on REP interfaces - REP detects link failures but may not detect unidirectional link conditions (where a link appears up but only carries traffic one way). UDLD fills this gap and is a valid complementary mechanism. (E) REP supports VLAN load balancing by allowing different VLANs to be blocked at different segment edge ports, distributing traffic across both ring paths for optimal bandwidth utilization - this is a supported and valuable REP feature. The other choices are incorrect: (A) connecting two REP segments redundantly at two points creates topology issues inconsistent with REP's segment model; (C) sub-50ms convergence is typical but not a blanket guarantee for all segment sizes; (D) REP segments support up to 250 switches - a limit of seven is incorrect.

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