Examkin

Soru

Zorluk: OrtaNetwork Performance Monitoring and Metrics

A system administrator monitoring enterprise server infrastructure notices that a critical database connection experiences low throughput and high packet retransmissions. Interface telemetry on the switch port reveals an increasing count of late collisions, runts, and CRC frame errors, even though link bandwidth utilization remains under 15%. Which of the following interface issues is the most probable root cause of these performance metrics?

  1. A duplex mismatch between the switch port and the database server network cardCevap
  2. B
    Physical cable degradation causing excessive electrical attenuation along the run
  3. C
    An unencrypted SNMPv2c polling agent overflowing the port buffer queue
  4. D
    Excessive UDP jitter causing TCP window throttling on management port 161

Cevap

A duplex mismatch between the switch port and the database server network card is the most probable root cause.
A duplex mismatch occurs when one end of an Ethernet link operates in full-duplex mode while the opposing end operates in half-duplex mode. The full-duplex device transmits data whenever ready without checking for carrier sense, causing the half-duplex device to detect collisions mid-transmission (late collisions), resulting in runts and CRC frame errors.

Adım Adım Çözüm

1
Analyze the reported interface metrics
Identified low bandwidth utilization (<15%) alongside high rates of late collisions, runts, and CRC errors.
Late collisions occur when a device detects a collision after transmitting the first 64 bytes of a frame, indicating a collision domain timing misconfiguration.
2
Evaluate layer 2 duplex operation mechanisms
Recognized that when one side of a link is forced to full-duplex and the other auto-negotiates to half-duplex, the half-duplex end senses collisions while the full-duplex end transmits continuously.
This mismatch causes frame corruption, runts, CRC errors, and late collisions on the half-duplex interface.
3
Correlate symptoms to the correct diagnostic cause
Determined that duplex mismatch directly explains all observed metric anomalies without indicating physical cable failure.
Correctly pinpoints duplex settings rather than cable integrity or SNMP management traffic.

Anahtar Kavram

Duplex Mismatch Diagnostic Metrics
Bu soruyu puanla

Konular

Network Performance Monitoring and Metrics

Bu konudan daha fazla soru