This scenario describes a rogue access point - a malicious or unauthorized wireless access point that uses the same SSID as the legitimate network. Users may connect to it unknowingly, which can result in limited network access, data interception, or redirection of traffic. The inability to reach internal file servers supports this being an unauthorized AP with no connection to internal resources.
A). A DNS issue would impact name resolution, not connectivity to file servers directly.
B). VLAN issues generally affect segmentation, not mimic SSID problems.
C). An incorrect IP address could cause connectivity issues, but not in the presence of a malicious AP broadcasting the same SSID.
Reference:
CompTIA A+ 220-1102 Objective 2.4: Compare and contrast wireless and physical security threats.
Study Guide Section: Rogue access points and their detection