100-150 Question 183
Single answerA network administrator is troubleshooting why devices on a local network cannot communicate with devices on a remote network. After verifying that the local devices can communicate with each other, the administrator suspects an issue with the configuration of the default gateway. Which of the following is the MOST likely cause of the problem?
- A
The default gateway is not configured on the local devices.
- B
The switch connecting the local devices is a Layer 2 switch without routing capabilities.
- C
The IP address of the default gateway is on a different subnet from the local devices.
- D
The local network devices are using static IP addresses instead of DHCP.
Show answer and explanation
Correct answer: C
Explanation
For local devices to communicate with remote networks, they must send traffic destined for those networks to the default gateway. If the default gateway's IP address is on a different subnet from the devices, they will be unable to reach it, causing communication with remote networks to fail. This makes option 3 the most likely cause of the problem in this scenario.
- A. Incorrect.
If the default gateway is not configured on local devices, they would not be able to send traffic to remote networks. However, in this scenario, the problem specifically mentions that the issue is related to configuration, not a lack of a gateway.
- B. Incorrect.
A Layer 2 switch does not have routing capabilities, but this is not relevant to the issue because the switch is successfully connecting local devices. The problem lies with communication to remote networks.
- C. Correct.
If the IP address of the default gateway is on a different subnet from the local devices, the devices will not be able to communicate with the gateway, preventing access to remote networks.
- D. Incorrect.
Using static IP addresses instead of DHCP is not inherently a problem as long as the IP settings, including the default gateway, are manually configured correctly.