Question

Difficulty: HardNetwork Performance Monitoring and Metrics

An enterprise network engineer is analyzing performance degradation across a site-to-site WAN link supporting real-time voice traffic. Network monitoring shows low overall latency, but voice quality suffers from audio artifacts caused by uneven packet delivery intervals. Additionally, organization compliance policies mandate that device metrics gathered from edge routers must support user authentication and payload encryption. Which TWO of the following metrics or protocol configurations should the engineer implement to address these requirements? (Select TWO)

  1. Analyze packet jitter metrics to measure the variation in arrival delay across voice streams.Answer
  2. Implement SNMPv3 using the authPriv security level to secure router telemetry polling.Answer
  3. C
    Configure SNMPv2c with community strings to encrypt router performance metrics sent across the WAN.
  4. D
    Configure an IPFIX telemetry stream using TCP port 161 to guarantee reliable transport of delay metrics.

Answer

The engineer must monitor jitter to measure latency variation in voice streams and deploy SNMPv3 with authPriv to encrypt telemetry polling.
Analyzing packet jitter allows engineers to isolate delay variance impacting real-time media streams, while configuring SNMPv3 with authPriv ensures device telemetry is protected using user authentication and AES payload encryption.

Step-by-Step Solution

1
Identify the relevant performance metric for audio distortion caused by inconsistent arrival times.
Jitter is identified as the rate of variance in delay, directly addressing packet buffer issues in real-time voice traffic.
Mean latency alone does not capture arrival time fluctuations that impact real-time playback buffers.
2
Evaluate remote monitoring protocol security levels against encryption and authentication compliance rules.
SNMPv3 authPriv is selected because it enforces both authentication (auth) and privacy/encryption (priv).
SNMPv1 and SNMPv2c lack native cryptographic encryption, sending credentials in plaintext.

Key Concept

Network Performance Metrics (Jitter) and Secure SNMP Management (SNMPv3 authPriv)
Estimated Time:2m 0s
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