When employees have multiple concurrent connections, what might be happening to the vpn system?
a. there may be a software failure.
b. employees may be trying to access the system from remote locations.
c. there may be a security issue.
d. there may be a hardware failure.

There may be a hardware failure happen to the VPN system.

D. There may be a hardware failure.

Explanation:

Normally end user allowed to have one connection at time, unless or until I end user workstation or laptop or desktop has multiple Ethernet card interface (mostly not possible) he or she try to connect multiple concurrent connection. Improper rerouting is done. Some time it will work.

Since pc has multiple tcpip address accessing the remote connection will not success. As far as VPN connectivity it is one to one connectivity on workstation or desktop or laptop. As net result it will be hardware failure.

answer; its the top layer;