CompTIA CNX-001 Exam - Topic 2 Question 1 Discussion

Actual exam question for CompTIA's CNX-001 exam

Question #: 1
Topic #: 2

An administrator needs to add a device to the allow list in order to bypass user authentication of an AAA system. The administrator uses MAC filtering and needs to discover the device's MAC address to accomplish this task. The device receives an IP address from DHCP, but the IP address changes daily. Which of the following commands should the administrator run on the device to locate its MAC address?

Aipconfig /all

Bnetstat -an

Carp -a

Dnslookup

Show Suggested Answer

Suggested Answer: A

Running ipconfig /all on the device will display the physical (MAC) address of each network adapter, allowing you to copy the correct MAC for your allow-list entry.

by Felicia at Jun 11, 2025, 09:29 PM

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Fallon

2 months ago

Yeah, A is solid, but C is also useful for checking connected devices.

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Ruthann

2 months ago

Wait, can you really find the MAC with ipconfig? Seems off.

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Tomoko

2 months ago

I think C is the right choice here, it lists all MACs in the ARP table.

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Kattie

3 months ago

I thought nslookup was for DNS stuff, not MAC addresses?

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Claribel

3 months ago

Definitely go with A, it shows the MAC address.

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Janessa

3 months ago

"nslookup" is definitely for DNS queries, so that one can be ruled out. I feel like "arp -a" is the best option here.

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Zita

3 months ago

I’m a bit confused; I thought "netstat -an" was for viewing active connections, so I don’t think that’s it.

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Catarina

4 months ago

I remember practicing with similar questions, and "arp -a" seems like it could be the right choice since it lists IP to MAC address mappings.

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Felicidad

4 months ago

I think the command we need is related to network configuration, maybe something like "ipconfig /all"? But I'm not entirely sure if that shows the MAC address directly.

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Deane

4 months ago

I'm pretty confident that option C, arp -a, is the right answer here. The question specifically says the device gets an IP address from DHCP, so the MAC address should be visible in the ARP cache.

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Rebbecca

4 months ago

I'm a little confused by this one. The IP address changes daily, so I'm not sure if any of these options will reliably find the MAC address. Maybe there's a better way to approach this that I'm missing.

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Natalie

4 months ago

Okay, I think I've got this. Since the IP address changes daily, the best way to find the MAC address is to use the arp -a command. That will show the MAC address associated with the device's current IP address.

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Mayra

5 months ago

Hmm, I'm a bit unsure here. The question mentions the device gets an IP address from DHCP, so I'm not sure if arp -a will work. Maybe ipconfig /all would be a better option?

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Billy

5 months ago

This seems like a pretty straightforward question. I'd go with option C - arp -a to find the MAC address.

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Blondell

7 months ago

Nah, nslookup? Really? That's for DNS stuff, not MAC addresses. C is the way to go!

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Raina

8 months ago

Haha, this is like a game of 'Find the MAC Address' - gotta love those IT puzzles!

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Dean

6 months ago

Exactly! It's all about finding the right command to solve the puzzle.

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Brice

7 months ago

I know right! It's like a little IT scavenger hunt.

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Janna

7 months ago

C) arp -a

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Laquita

7 months ago

A) ipconfig /all

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Man

7 months ago

C) arp -a

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Whitley

7 months ago

A) ipconfig /all

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Emmett

8 months ago

I'm not sure, but I think ipconfig /all could also show the MAC address. Can someone confirm?

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Gerald

8 months ago

I agree with Boris, arp -a is the right command to find the MAC address.

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Catina

8 months ago

I'm going with A. The ipconfig /all command should show you the MAC address along with other juicy network details.

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Alba

7 months ago

User 3: Let's try both commands to be sure. It's better to cover all our bases.

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Alva

7 months ago

User 2: I'm not sure, but I believe A) ipconfig /all would give us the MAC address we need.

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Daron

8 months ago

User 1: I think C) arp -a might be the right command to find the MAC address.

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Delisa

8 months ago

Hmm, I'm not sure. Maybe B? The netstat -an command could give you some network info, right?

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Bea

8 months ago

User2: User1 is right. You should use the arp -a command to find the MAC address.

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Linette

8 months ago

User1: No, the netstat -an command won't give you the MAC address. Try again.

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Boris

8 months ago

I think the answer is C) arp -a because it shows the MAC address of devices on the network.

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Louis

8 months ago

Definitely C! The arp -a command will show the MAC addresses of all the devices on the network. Easy peasy!

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Kenneth

7 months ago

C! The arp -a command will show the MAC addresses of all the devices on the network.

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Cornell

7 months ago

D) nslookup

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Donte

7 months ago

C) arp -a

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Vincenza

7 months ago

B) netstat -an

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Dominic

8 months ago

A) ipconfig /all

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