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N10-005 · Question #624

Kim, a user, took a laptop on vacation and made changes to the configuration in order to use the device at the hotel. She can reach the Internet, but cannot access any internal network resources…

The correct answer is A. Incorrect DNS. After reconfiguring a laptop for hotel use, the DNS server is likely set to the hotel's public DNS, which cannot resolve internal corporate hostnames.

Network troubleshooting

Question

Kim, a user, took a laptop on vacation and made changes to the configuration in order to use the device at the hotel. She can reach the Internet, but cannot access any internal network resources. Which of the following is the MOST likely reason?

Options

  • AIncorrect DNS
  • BIncorrect subnet mask
  • CDuplicate IP address
  • DIncorrect SSID

How the community answered

(44 responses)
  • A
    82% (36)
  • B
    7% (3)
  • C
    2% (1)
  • D
    9% (4)

Why each option

After reconfiguring a laptop for hotel use, the DNS server is likely set to the hotel's public DNS, which cannot resolve internal corporate hostnames.

AIncorrect DNSCorrect

Internal network resources are typically identified by private hostnames that are only resolvable by the organization's internal DNS servers. When the laptop was reconfigured for the hotel, the DNS server setting was changed to the hotel's DNS, which can resolve public Internet names (explaining why Internet access works) but cannot resolve internal corporate resource names, blocking access to those resources.

BIncorrect subnet mask

An incorrect subnet mask would typically break all network connectivity including Internet access, but the user can reach the Internet normally, ruling out a subnet mask problem.

CDuplicate IP address

A duplicate IP address would cause intermittent or complete connectivity failures for the conflicting device, not a clean split where Internet works but internal resources do not.

DIncorrect SSID

An incorrect SSID would prevent the laptop from associating with any wireless network at all - since the user has Internet access, the SSID and wireless connection are functioning correctly.

Concept tested: DNS configuration impact on internal resource resolution

Source: https://learn.microsoft.com/en-us/windows-server/networking/dns/dns-top

Topics

#DNS configuration#split-horizon DNS#internal resources#VPN/remote access

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