100-150 Question 65
Single answerYou are troubleshooting a network connectivity issue for a small business. The IT team informs you that a device with the IP address 192.168.1.50 cannot access the internet. Upon investigation, you notice that the router's WAN interface is configured with the IP address 203.0.113.10. Why is the device unable to access the internet?
- A
The device's IP address is a public address and cannot route properly.
- B
The router's IP address is a private address that cannot communicate with the internet.
- C
The device's IP address is a private address and requires NAT to access the internet.
- D
The router's IP address is not assigned to the correct subnet.
Show answer and explanation
Correct answer: C
Explanation
Private IP addresses, such as 192.168.1.50, are reserved for use within internal networks and cannot directly access the internet. NAT is required to translate private addresses into a public address (e.g., 203.0.113.10) for communication with external networks. In this scenario, the issue likely stems from a lack of proper NAT configuration.
- A. Incorrect.
Incorrect: 192.168.1.50 is a private address, not a public address, and private addresses are routable within internal networks.
- B. Incorrect.
Incorrect: 203.0.113.10 is a public IP address, which is valid for internet communication.
- C. Correct.
Correct: 192.168.1.50 is a private IP address, which cannot directly communicate with the public internet. Network Address Translation (NAT) is required to map private addresses to the router's public IP address for internet access.
- D. Incorrect.
Incorrect: There is no evidence that the router's IP address is assigned to the wrong subnet. The WAN interface's public address (203.0.113.10) is valid.