Which of the following routing technologies uses unequal cost load balancing and port 88?

EIGRP uniquely supports unequal cost load balancing, allowing traffic distribution over paths with different metrics, unlike OSPF or RIP which typically only support equal cost load balancing. It also utilizes its custom Reliable Transport Protocol (RTP) which runs directly over IP and is assigned IP protocol number 88 for its communication between neighbors.

BGP is an exterior gateway protocol that primarily uses TCP port 179 for neighbor communication and does not inherently support unequal cost load balancing in the same manner as EIGRP.

RIP is a distance-vector protocol that uses UDP port 520 for routing updates and only supports equal cost load balancing, distributing traffic evenly across paths with identical metrics.

OSPF is a link-state protocol that uses IP protocol 89 for routing messages and typically performs equal cost load balancing over paths with the same shortest path cost.