A user in a branch office reports that access to all files has been lost after receiving a new PC. All other users in
the branch can access fileshares. The IT engineer who is troubleshooting this incident is able to ping the
workstation from the branch router, but the machine cannot, ping the router. Which of the following is MOST
likely the cause of the incident?


A. Incorrect subnet mask
B. Incorrect DNS server
C. Incorrect IP class
D. Incorrect TCP port