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Zorluk: Çok zorUtilizing Hardware Testers and Packet Analyzers

A network systems engineer is investigating severe network degradation on a newly deployed 90-meter Category 6A UTP link connecting an access switch to a server cluster. Server nodes on this link report intermittent link flapping, high frame loss, and an inability to obtain dynamic IP configurations from the centralized DHCP server. To conduct a comprehensive diagnosis of both physical layer integrity and transport protocol operations for this issue, which TWO of the following tools or capture filter configurations should the engineer utilize? (Select TWO)

  1. Attach a Time-Domain Reflectometer (TDR) to the UTP run to measure signal reflections and pinpoint the precise linear distance to any physical conductor breaks or impedance mismatches.Cevap
  2. B
    Use a simple wiremap continuity tester to measure high-frequency near-end crosstalk (NEXT) and determine the exact location of internal pair twists.
  3. Configure a packet analyzer filter specifying `udp port 67 or udp port 68` to capture and inspect DHCPOFFER and DHCPACK transaction frames.Cevap
  4. D
    Configure a packet analyzer filter specifying `tcp port 67 or tcp port 68` to monitor reliable connection-oriented handshakes during DHCP Discover broadcasts.

Cevap

The network engineer should attach a Time-Domain Reflectometer (TDR) to locate physical cabling faults by distance, and set a packet analyzer filter for UDP ports 67 and 68 to inspect DHCP protocol traffic.
Using a Time-Domain Reflectometer (TDR) allows the administrator to send signals down the Category 6A cabling and calculate the distance to pin breaches or impedance disruptions. Additionally, setting a packet capture filter for UDP ports 67 and 68 captures the full DHCP DORA sequence, enabling analysis of lease negotiations.

Adım Adım Çözüm

1
Evaluate the physical layer diagnostic requirement.
Identify that a Time-Domain Reflectometer (TDR) is required to pinpoint physical cable impairments such as impedance mismatches or breaks along copper runs.
Simple wiremap continuity testers only confirm pin-to-pin alignment and cannot measure distance to faults or high-frequency electrical characteristics.
2
Evaluate the upper-layer packet capture requirement for DHCP troubleshooting.
Identify that DHCP traffic uses UDP port 67 (server) and UDP port 68 (client).
DHCP is a connectionless protocol that uses UDP rather than TCP. Filtering for TCP port 67 or 68 would incorrectly filter out all legitimate DHCP packets.

Anahtar Kavram

Physical Cable Fault Localization and Packet Filter Construction
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Konular

Utilizing Hardware Testers and Packet Analyzers

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