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Difficulty: MediumNetwork Performance Monitoring and Metrics

A network administrator is investigating reports of intermittent data backup failures across a core router interface. Although 5-minute average polling shows link utilization peaks at only 65%, interface statistics report a high count of egress packet drops during peak backup windows. The administrator needs to implement a telemetry and polling solution to capture short burst congestion while ensuring secure remote monitoring. Which of the following approaches best addresses this requirement?

  1. Configure flow telemetry (IPFIX/NetFlow) combined with SNMPv3 using authPriv to monitor fine-grained traffic flows and encrypted interface metrics.Answer
  2. B
    Deploy SNMPv1 polling with read-only community strings to reduce encryption processing overhead on the router during high-traffic bursts.
  3. C
    Reconfigure real-time flow telemetry exporters to use TCP instead of UDP to ensure that dropped flow records are retransmitted during buffer congestion.
  4. D
    Redirect sFlow telemetry export streams to standard SNMP trap port 162 so the monitoring server consolidates traps and flow data under a single port listener.

Answer

Configure flow telemetry (IPFIX/NetFlow) combined with SNMPv3 using authPriv to monitor fine-grained traffic flows and encrypted interface metrics.
Combining flow telemetry (IPFIX/NetFlow) with SNMPv3 (authPriv) provides both high-resolution visibility into traffic microbursts causing buffer drops and secure, encrypted management polling for interface statistics.

Step-by-Step Solution

1
Analyze the monitoring symptom
Standard 5-minute SNMP polling averages out short traffic spikes (microbursts), masking buffer exhaustion that leads to egress frame drops.
High-frequency microbursts require flow-based telemetry (NetFlow/IPFIX) to identify specific bandwidth-consuming applications and traffic spikes.
2
Evaluate security and protocol requirements
SNMPv3 with authPriv ensures authentication and AES payload encryption, satisfying secure monitoring requirements.
Legacy SNMP versions (v1/v2c) transmit credentials in cleartext and lack privacy protections.

Key Concept

Network Telemetry and SNMP Security Levels
Estimated Time:1m 30s
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Topics

Network Performance Monitoring and Metrics

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