Cisco Certified Network Professional Practice Test 2026 – Your All-in-One Guide to Exam Success!

The correct answer is RPR+. This redundancy mode is designed to ensure that during a standby state, there are no Layer 2 or Layer 3 functions occurring. RPR+ (Resilient Packet Ring Plus) operates by switching over to the active path only when a fault is detected, and in this standby state, the member node does not participate in data forwarding. This behavior ensures that the network remains stable and free from unnecessary overhead or conflicts during the standby condition.

In contrast, other options like RPR would still allow some operational capability in a standby state, which means Layer 2/Layer 3 functions might still occur. SSO (Stateful Switchover) aims to maintain session and data integrity across active and standby devices in a more traditional router configuration, allowing for continuity of services even when one unit is down. MEC (Multichassis EtherChannel) enables multiple switches to work together as one logical switch for load balancing and redundancy but does not restrict Layer 2/Layer 3 functions in standby mode.

Thus, RPR+ is specifically designed to prevent any functions while in standby, contributing to its reliability in a redundancy situation.