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Cisco 300-710 Exam - Topic 3 Question 74 Discussion

Actual exam question for Cisco's 300-710 exam
Question #: 74
Topic #: 3
[All 300-710 Questions]

An engineer must investigate a connectivity issue from an endpoint behind a Cisco FTD device and a public DNS server. The endpoint cannot perform name resolution queries. Which action must the engineer perform to troubleshoot the issue by simulating real DNS traffic on the Cisco FTD while verifying the Snarl verdict?

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Suggested Answer: B

The Capture w/Trace wizard in Cisco FMC allows you to capture packets on an FTD device and trace their path through the Snort engine. This can help you troubleshoot connectivity issues from an endpoint behind an FTD device and a public DNS server, as well as verify the Snort verdict for the DNS traffic. The Capture w/Trace wizard lets you specify the source and destination IP addresses, ports, and protocols for the packets you want to capture and trace, as well as the FTD device and interface where you want to perform the capture. You can also apply filters to limit the capture size and duration.After you start the capture, you can ping the DNS server from the endpoint and then view the captured packets and their Snort verdicts in the FMC web interface2.

To use the Capture w/Trace wizard in Cisco FMC, you need to follow these steps2:

In the FMC web interface, navigate to Troubleshooting > Capture/Trace.

Click New Capture.

Choose an FTD device from the Device drop-down list.

Choose an interface from the Interface drop-down list.

Enter the source and destination IP addresses, ports, and protocols for the packets you want to capture and trace. For example, if you want to capture DNS queries from an endpoint with IP address 10.1.1.100 to a DNS server with IP address 8.8.8.8, you can enter these values:

Source IP: 10.1.1.100

Source Port: any

Destination IP: 8.8.8.8

Destination Port: 53

Protocol: UDP

Optionally, apply filters to limit the capture size and duration. For example, you can set the maximum number of packets to capture, the maximum capture file size, or the maximum capture time.

Click Start.

Ping the DNS server from the endpoint and wait for some packets to be captured.

Click Stop to stop the capture.

Click View Capture to see the captured packets and their Snort verdicts.

The other options are incorrect because:

Performing a Snort engine capture using tcpdump from the FTD CLI will not allow you to trace the path of the packets through the Snort engine or verify their Snort verdicts.Tcpdump is a command-line tool that can capture packets on an FTD device, but it does not provide any information about how Snort processes those packets or what actions Snort takes on them2.

Creating a Custom Workflow in Cisco FMC will not help you troubleshoot a connectivity issue from an endpoint behind an FTD device and a public DNS server. A Custom Workflow is a user-defined set of pages that display event data in different formats, such as tables, charts, maps, and so on.A Custom Workflow does not allow you to capture or trace packets on an FTD device3.

Running the system support firewall-engine-debug command from the FTD CLI will not allow you to simulate real DNS traffic on the FTD device or verify the Snort verdict for that traffic. The firewall-engine-debug command is a diagnostic tool that can generate synthetic packets and send them through the Snort engine on an FTD device.The synthetic packets are not real network traffic and do not affect any connections or policies on the FTD device4.


by Cecil at Oct 02, 2023, 06:40 PM

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Suzi
4 months ago
Custom Workflow seems unnecessary for just DNS troubleshooting, right?
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Jarvis
4 months ago
Wait, can you really use the Snort engine for this? Sounds a bit off.
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Penney
5 months ago
Not so sure about that, I feel like tcpdump might give more detailed info.
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Coletta
5 months ago
Definitely agree, the Capture w/Trace wizard is super handy!
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Viola
5 months ago
I think option B is the best choice for capturing DNS traffic.
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Beula
5 months ago
Running the firewall-engine-debug command sounds familiar, but I don't think it specifically addresses DNS traffic simulation.
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Lai
5 months ago
I feel like creating a Custom Workflow could be useful, but it seems more complex than just capturing the traffic directly.
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Laurena
6 months ago
I remember practicing with tcpdump, but I can't recall if it's the best option for simulating DNS traffic on the FTD.
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Avery
6 months ago
I think using the Capture w/Trace wizard in Cisco FMC might be the right choice since it allows for visualizing traffic, but I'm not entirely sure.
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Mohammad
6 months ago
This is a tricky one, but I think option B is the way to go. The Capture w/Trace wizard in Cisco FMC should allow me to capture the DNS traffic and see how the Snort engine is handling it. I'll make sure to read through the question carefully and double-check my answer.
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Hildred
6 months ago
Okay, I think I've got this. The key is to use a tool that can capture and analyze the DNS traffic while verifying the Snort verdict. Option B with the Capture w/Trace wizard in Cisco FMC seems like the way to go.
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Lisbeth
6 months ago
Hmm, I'm a bit unsure about this one. The question mentions simulating real DNS traffic, so I'm not sure if the tcpdump option in A would be the best approach. I'll have to think this through a bit more.
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Marcelle
6 months ago
This looks like a pretty straightforward troubleshooting question. I'd go with option B and use the Capture w/Trace wizard in Cisco FMC to simulate the DNS traffic and verify the Snort verdict.
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Sheridan
6 months ago
I'm a little confused by the wording of the question. Does the "Snarl verdict" refer to the Snort verdict? If so, then option B sounds like the right choice to simulate the DNS traffic and verify the Snort results.
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Deeann
6 months ago
I'm a bit confused by the different options presented here. I'll need to carefully analyze each one to determine which expression uses the correct AND logic.
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Pearly
6 months ago
I've reviewed the course materials on Medicaid, so I feel reasonably confident about this type of question. I'll read through the choices and select the one that best matches my understanding of how Medicaid health plan entities operate.
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Kenneth
6 months ago
I remember studying the differences between these deployment options. Was it Hardware Appliance that had a license key? I'm confused.
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Johnetta
6 months ago
Okay, let's take this step-by-step. First, I'll identify the network portion and host portion of the IP address based on the subnet mask. Then, I'll determine if the address falls within the appropriate range for the given network. That should help me identify the configuration error.
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