A network technician is troubleshooting an enterprise building interconnect where a newly provisioned multi-mode fiber link experiences high frame loss, while workstation clients on the attached Ethernet segment fail to receive automatic IP configurations. Which of the following diagnostic tools or analyzer filters should the technician utilize to isolate these physical and application layer issues? (Select TWO.)
- An Optical Time-Domain Reflectometer (OTDR) to identify attenuation, macrobends, and distance to optical breaks along the fiber cable run.Answer
- A packet analyzer filter configured for UDP ports 67 and 68 to inspect DHCP request and acknowledgment frames.Answer
- CA copper Time-Domain Reflectometer (TDR) to evaluate optical insertion loss and light signal polarization across the strand.
- DA packet analyzer filter configured for TCP port 67 to capture connection-oriented DHCP handshake traffic.
Answer
The technician should use an Optical Time-Domain Reflectometer (OTDR) to diagnose the fiber link and apply a packet analyzer filter for UDP ports 67 and 68 to capture DHCP traffic.
An OTDR is specifically designed to locate physical anomalies and measure signal attenuation in optical fiber links. Furthermore, DHCP relies on UDP (ports 67 and 68), so filtering for these UDP ports allows the technician to capture and analyze automatic IP address assignment traffic.
Step-by-Step Solution
Key Concept
Selecting appropriate hardware testers (OTDR vs. TDR) for fiber cabling and filtering protocol traffic (DHCP over UDP 67/68) using packet analyzers.