What command would the network administrator issue to determine if load balancing is in effect on a router?

To see whether load balancing is in effect, check the routing table. Load balancing is in effect if two or more routes are associated with the same destination.

The show ip route command reveals that the destination network 192.168.6.0 is available through 192.168.2.1 (Serial 0/0/0) and 192.168.4.1 (Serial 0/0/1).