Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) v1.2Network AssuranceMedium
A network engineer is troubleshooting intermittent connectivity issues for a critical application server. The engineer suspects packet loss or excessive latency between the server and its gateway. Which IP SLA operation type would be most effective for continuously monitoring these specific metrics?
- AICMP Echo
- BHTTP
- CDNS
- DUDP Jitter
Show answer & explanationAnswer & explanation
Correct answer: D. UDP Jitter
UDP Jitter operations measure latency, jitter (variance in latency), and packet loss for UDP traffic, which is highly relevant for real-time application performance. While ICMP Echo can check reachability and basic RTT, UDP Jitter provides more granular metrics directly applicable to the scenario's concern about 'packet loss or excessive latency'.
Why the other options are wrong
- A. ICMP Echo primarily measures round-trip time (RTT) and reachability; it does not directly measure packet loss or jitter for application traffic.
- B. HTTP operations monitor web service responsiveness, not general network packet loss or latency between a server and gateway.
- C. DNS operations monitor DNS resolution times, which is not the primary focus of the connectivity issue.
IP SLA UDP Jitter
An IP SLA operation that measures one-way latency, two-way latency (round-trip time), jitter, and packet loss for UDP traffic between a source and a responder.
- Requires an IP SLA responder on the target device.
- Provides granular metrics for real-time application performance.
- Useful for voice and video quality assessment.
Memory trick: Ping (ICMP) checks reach, Jitter (UDP) checks flow, HTTP checks web, DNS checks name, all for network show.