NVIDIA Certified Professional: AI Networking Practice Questions: Spectrum-X Troubleshooting Domain

Correct Answer: A

Explanation: Multicast routing configuration should be verified first since improper configuration can lead to dropped multicast packets. VLAN assignments and QoS settings can affect traffic flow and prioritization but are less likely to directly cause multicast packet drops. Access control lists might block multicast traffic, but this is secondary to ensuring routing is correctly configured.

Correct Answer: A

Explanation: The correct answer is A. An incorrect IP address configuration can prevent the switch from communicating with the network management console. Ensuring the switch has the correct IP settings is essential for it to appear in the console. A software update for the management console (option B) is unlikely to be the immediate cause. Outdated hardware (option C) and malfunctioning LEDs (option D) do not directly affect the switch's appearance in the console.

Correct Answer: D

Explanation: Checking for port congestion and analyzing traffic patterns using telemetry data is the most effective way to identify issues related to packet loss in a Spectrum-X environment. Telemetry provides real-time insights into network performance and can help pinpoint specific ports or links that are congested. Reviewing configuration files (A) can help identify misconfigurations but is less likely to address intermittent issues. Firmware updates (B) and cable replacements (C) are maintenance activities that may not directly address the root cause of packet loss.

Correct Answer: A

Explanation: Checking the switch logs for error messages related to packet forwarding is an effective diagnostic step because it allows network administrators to identify any specific issues or patterns that might be causing packet loss. Logs can provide insights into hardware failures, misconfigurations, or network congestion that need to be addressed. Rebooting switches or increasing buffer sizes may not address the underlying issue, and disabling QoS could worsen traffic management.

Correct Answer: B

Explanation: The 'traceroute' tool is used to trace the path that packets take through the network, which is essential for diagnosing connectivity issues. 'Ping' checks connectivity but does not provide path details, while 'netstat' and 'ifconfig' are used for different purposes.

Correct Answer: B

Explanation: The 'show interfaces status' command provides information about the status of each port on the switch, including whether they are up or down, which is critical for diagnosing forwarding issues. 'show ip route' (A) is used for routing table information, 'show vlan brief' (C) displays VLAN configurations, and 'show spanning-tree' (D) provides spanning tree protocol status, none of which directly address port status.

Correct Answer: B

Explanation: Checking the port speed and duplex settings is a critical first step in diagnosing link flaps, as mismatched settings can cause frequent link state changes. Replacing the cable or rebooting the switch may be necessary later, and upgrading firmware is not an immediate troubleshooting step.

Correct Answer: A

Explanation: The 'show environment' command provides information about the hardware status, including temperature, power supply, and fan status, which are critical for identifying hardware failures. 'show version' (B) provides software version details, 'show ip interface brief' (C) gives a summary of interface status, and 'show running-config' (D) displays the current configuration, none of which directly indicate hardware failures.

Correct Answer: B

Explanation: Port mirroring can lead to high latency on the mirrored ports because it duplicates traffic for monitoring purposes, which can overload the port. High CPU usage might also cause latency, but port mirroring is a more direct cause. Incorrect ACLs and loopback misconfiguration are less likely to directly cause high latency.

Correct Answer: B

Explanation: The correct answer is B. Checking for port congestion and analyzing traffic patterns is a critical first step in diagnosing latency issues. This helps identify if the problem is due to high traffic on certain ports or links. Rebooting devices or upgrading firmware (options A and C) should only be considered after identifying the root cause. Reconfiguring the network topology (option D) is a more drastic step that should be based on thorough analysis.