CompTIA Network+ (N10-008) — Question 816

Users are connected to a switch on an Ethernet interface of a campus router. The service provider is connected to the serial 1 interface on the router. The output of the interfaces is:

E1/0: 192.168.8.1/24 -

S1: 192.168.7.252/30 -

After router and device configurations are applied, internet access is not possible. Which of the following is the most likely cause?

Answer options

• A. The Ethernet interface was configured with an incorrect IP address.
• B. The router was configured with an incorrect loopback address.
• C. The router was configured with an incorrect default gateway.
• D. The serial interface was configured with the incorrect subnet mask.

Correct answer: D

Explanation

The correct answer is D because an incorrect subnet mask on the serial interface can prevent proper routing to the internet. Options A, B, and C do not directly impact the path to the service provider's network, which is essential for internet access.