Which statement correctly describes the IP SLA responder?
- The IP SLA source and responder communicate over TCP.
- The responder can respond to multiple IP SLA measurement operations that try to connect to the same port number.
- IP SLA operation with the responder has two phases: control and management.
- All IP SLA tests will only work if the IP SLA responder is used.
Explanation: The IP SLA responder is a Cisco IOS feature that enhances measurement accuracy by adding timestamps to packets to account for processing latency. It is designed to be highly scalable, allowing it to respond to multiple concurrent measurement operations even when they utilize the same port number. While it uses UDP port 1967 for control messages (refuting the TCP option), the responder is not required for all tests—basic operations like ICMP echoes can target any standard IP device, though advanced metrics like jitter often require the responder for accuracy.
Related exam: Modules 17 – 20: Checkpoint Exam: Virtualization and Network Services Answers (CCNP ENCOR v9)
