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Zorluk: OrtaUtilizing Hardware Testers and Packet Analyzers

A network administrator is investigating two distinct issues following an office expansion: several new workstation copper cabling drops are experiencing intermittent physical link loss, while other hosts on the subnet are intermittently failing to obtain valid IP configuration settings due to suspected rogue server activity on the local VLAN. Which of the following tools and diagnostic approaches should the technician utilize to isolate these issues? (Select TWO)

  1. Use a Time-Domain Reflectometer (TDR) to measure internal signal reflections and determine the exact distance to a physical break or impedance discontinuity along the copper cable run.Cevap
  2. Apply a packet analyzer capture filter for UDP ports 67 and 68 to capture and inspect DHCP transaction traffic across the local broadcast domain.Cevap
  3. C
    Connect a simple pin-to-pin cable continuity tester to calculate the precise distance of a high-attenuation signal reflection inside the wall conduit.
  4. D
    Apply a packet analyzer capture filter for TCP port 67 to analyze Layer 2 frame payload encapsulation during host address negotiation.

Cevap

To isolate physical cabling faults and rogue DHCP server activity, the administrator should use a Time-Domain Reflectometer (TDR) to pinpoint cable break locations by distance, and apply a packet analyzer filter specifying UDP ports 67 and 68 to capture DHCP transaction packets.
The combination of using a Time-Domain Reflectometer (TDR) for distance-to-fault location on copper cabling and filtering a packet analyzer on UDP ports 67 and 68 for DHCP traffic correctly addresses both troubleshooting requirements. A TDR analyzes electrical pulse reflections to determine the location of cable breaks, while UDP ports 67/68 capture all DHCP server offers to pinpoint rogue DHCP servers.

Adım Adım Çözüm

1
Select the appropriate physical layer tester for locating specific cable distance breaks.
Identify that a Time-Domain Reflectometer (TDR) emits electrical pulses to measure signal reflection timing, directly outputting the distance to cable anomalies.
Basic continuity testers only check wire mapping and pin continuity without distance metrics.
2
Determine the transport protocol and port parameters for analyzing DHCP traffic.
Identify that DHCP operates on UDP port 67 (DHCP server) and UDP port 68 (DHCP client).
Filtering packet captures on UDP ports 67 and 68 isolates DHCP Discover, Offer, Request, and Acknowledgment frames to identify unauthorized server IP and MAC addresses.

Anahtar Kavram

Utilizing TDR hardware for physical fault distance measurement and packet analyzers for UDP-based protocol troubleshooting.
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Utilizing Hardware Testers and Packet Analyzers

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