Which of the following is the MOST likely cause of this issue?

A network engineer is troubleshooting wireless network connectivity issues that were reported by users. The issues are occurring only in the section of the building that is closest to the parking lot. Users are intermittently experiencing slow speeds when accessing websites and are unable to connect to network drives. The issues appear to increase when laptop users return desks after using their devices in other areas of the building. There have also been reports of users being required to enter their credentials on web pages in order to gain access to them .

Which of the following is the MOST likely cause of this issue?
A . An external access point is engaging in an evil-twin attack.
B . The signal on the WAP needs to be increased in that section of the building.
C . The certificates have expired on the devices and need to be reinstalled.
D . The users in that section of the building are on a VLAN that is being blocked by the firewall.

Answer: A