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N10-009 · Question #170

A network technician is troubleshooting network latency and has determined the issue to be occurring between two network switches (Switch10 and Switch11). Symptoms reported include poor video…

The correct answer is B. Modify Switch10 MTU value to 1500. The described symptoms of poor video performance and slow file copying between two switches suggest an issue with data transmission efficiency, and modifying the MTU value to the standard 1500 bytes is a likely solution if jumbo frames or MTU mismatches are causing…

Submitted by carlos_mx· Mar 6, 2026Network Troubleshooting

Question

A network technician is troubleshooting network latency and has determined the issue to be occurring between two network switches (Switch10 and Switch11). Symptoms reported include poor video performance and slow file copying. Given the following information:

Which of the following should the technician most likely do to resolve the issue?

Exhibits

N10-009 question #170 exhibit 1
N10-009 question #170 exhibit 2

Options

  • ADisable automatic negotiation on Switch11.
  • BModify Switch10 MTU value to 1500.
  • CConfigure STP on both switches.
  • DChange the native VLAN on the ports.

How the community answered

(17 responses)
  • A
    12% (2)
  • B
    76% (13)
  • C
    6% (1)
  • D
    6% (1)

Why each option

The described symptoms of poor video performance and slow file copying between two switches suggest an issue with data transmission efficiency, and modifying the MTU value to the standard 1500 bytes is a likely solution if jumbo frames or MTU mismatches are causing fragmentation or retransmissions.

ADisable automatic negotiation on Switch11.

Disabling automatic negotiation might force a specific speed/duplex but is less likely to directly address latency for video/file copying unless there's an existing negotiation mismatch causing link issues, which isn't explicitly stated.

BModify Switch10 MTU value to 1500.Correct

Poor video performance and slow file copying, especially when combined with latency, can be symptoms of an MTU mismatch or fragmentation occurring between the switches. Modifying the MTU value to the standard 1500 bytes (for Ethernet) ensures that packets are not excessively fragmented, which reduces overhead and improves throughput.

CConfigure STP on both switches.

Configuring STP (Spanning Tree Protocol) is primarily for preventing network loops, not for resolving latency or performance issues between two already functioning links, unless a loop is already present and causing broadcast storms, which is not indicated.

DChange the native VLAN on the ports.

Changing the native VLAN on ports would primarily affect VLAN tagging and untagged traffic, but it's not a common or direct solution for general network latency or poor application performance between switches.

Concept tested: Network latency, MTU settings, and performance optimization

Source: https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-mtu-size.html

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