Discuss CompTIA 220-1201 Exam Topic 5 Question 17

Which of the following is the most likely cause?

AThe subnet mask Is Incorrect.

BNetBIOS is enabled.

CDHCP is enabled.

DDNS servers are manually set.

Suggested Answer: D

The key detail in the ipconfig output is that the system is receiving an IP address, subnet mask, default gateway, and DHCP server information via DHCP, but the DNS servers shown are 8.8.8.8 and 8.8.4.4, which are Google's public DNS servers. In most corporate networks, DNS is provided internally by the DHCP server---usually the same device assigning the IP address. When DNS values are different from DHCP-provided defaults, it indicates manual DNS configuration.

CompTIA A+ emphasizes that mismatched DNS settings can cause browsing issues, name-resolution delays, or an inability to access internal resources. DNS is critical because it translates domain names into IP addresses; if manually configured, the device bypasses the organization's DNS server and may not resolve internal hostnames.

The subnet mask is correct for a Class B private network subdivided using /24 (255.255.255.0). NetBIOS being enabled is common and not a cause of connectivity issues here. DHCP being enabled is normal and functioning correctly, as shown by the proper IP lease obtained.

Thus, the anomalous and most likely problematic configuration is manually configured DNS, making Option D correct.

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20 comments · newest first

Shay 1 month ago

True, but if DHCP is misconfigured, it could cause issues too.

Julie 1 month ago

C is less likely. DHCP usually helps with IP assignment.

Felicitas 2 months ago

I’m leaning towards D. Manually set DNS can lead to resolution problems.

Karan 2 months ago

B could also be an issue. NetBIOS can cause conflicts sometimes.

Corinne 2 months ago

I agree, A makes sense. It’s a common mistake.

Malcolm 2 months ago

I think A is the most likely cause. Incorrect subnet mask can block communication.

Lon 2 months ago

D) DNS servers manually set? That’s a rare one, isn’t it?

Noe 2 months ago

Wait, is it really that common? I thought DHCP was the main culprit.

Justine 3 months ago

I think B) NetBIOS is enabled could be a problem too.

Jordan 3 months ago

Totally agree, subnet masks can mess everything up.

Maybelle 3 months ago

A) The subnet mask is incorrect. Classic issue!

Helga 3 months ago

I disagree, it’s probably A) the subnet mask.

Ty 3 months ago

Wait, D) DNS servers manually set? That’s surprising!

Lucina 4 months ago

C) DHCP is usually helpful, not a cause.

Carol 5 months ago

I think B) NetBIOS could be the culprit too.

Bobbie 5 months ago

A) The subnet mask is definitely a common issue.

Ardella 6 months ago

I remember discussing NetBIOS in class, and it seems like it could cause issues, but I don't know if it's the most likely cause in this scenario.

Leigha 6 months ago

I'm leaning towards option A, but I also recall that incorrect DNS settings can mess things up too. It's a bit confusing.

Krissy 6 months ago

I feel like I've seen a question similar to this in practice exams, and I think DHCP being enabled can sometimes lead to problems, but it might not be the most likely cause.

Carole 6 months ago

I think I remember something about subnet masks causing connectivity issues, but I'm not entirely sure if that's the main cause here.

CompTIA 220-1201 Exam - Topic 5 Question 17 Discussion