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350-601 · Question #363

Refer to the exhibit A network administrator experiences these issues with the network: PC1 is experiencing a buffering problem for video applications. The servers that are connected to SW2 are…

The correct answer is D. N9K(config)# monitor session 5 rx. To investigate packet drops and buffering issues, monitoring traffic in the receive (rx) direction on relevant interfaces allows capturing ingress packets as they arrive at the switch for analysis.

Network

Question

Refer to the exhibit A network administrator experiences these issues with the network:

PC1 is experiencing a buffering problem for video applications. The servers that are connected to SW2 are experiencing packet drops when they connect to the Internet. The engineer wants to configure the required traffic capture to investigate the issue further. Which configuration must be implemented to monitor the traffic?

Exhibit

350-601 question #363 exhibit

Options

  • AN9K(config)# monitor session 5 tx
  • BN9K(config)# monitor session 5 rx
  • CN9K(config)# monitor session 5 tx
  • DN9K(config)# monitor session 5 rx

How the community answered

(59 responses)
  • A
    17% (10)
  • B
    8% (5)
  • C
    3% (2)
  • D
    71% (42)

Why each option

To investigate packet drops and buffering issues, monitoring traffic in the receive (rx) direction on relevant interfaces allows capturing ingress packets as they arrive at the switch for analysis.

AN9K(config)# monitor session 5 tx

A monitor session in the `tx` (transmit) direction captures traffic as it leaves the specified switch interface, which might be useful for egress issues but less ideal for detecting initial packet drops or ingress congestion.

BN9K(config)# monitor session 5 rx

This option is syntactically incomplete as it lacks the source and destination for monitoring; however, if completed, `rx` direction is generally better for troubleshooting ingress issues.

CN9K(config)# monitor session 5 tx

This option is syntactically incomplete as it lacks the source and destination for monitoring; however, if completed, `tx` direction is less suitable for detecting ingress packet drops or the root cause of buffering from upstream.

DN9K(config)# monitor session 5 rxCorrect

Configuring a monitor session in the `rx` (receive) direction captures traffic as it enters the specified switch interface. This is crucial for troubleshooting issues like packet drops on ingress or analyzing traffic patterns before they are processed by the switch, which can contribute to buffering problems for downstream devices like PC1 or packet drops for servers.

Concept tested: Cisco Nexus monitor session (SPAN)

Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/system_management/configuration/guide/b-cisco-nexus-9000-series-nx-os-system-management-configuration-guide-7x/b-cisco-nexus-9000-series-nx-os-system-management-configuration-guide-7x_chapter_010.html

Topics

#Network Monitoring#SPAN#Troubleshooting#Cisco Nexus

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