单选题 Traditiona network layer packet forwording relies on the information provided by network layer ______ protocols, or static routing, to make an independent forwarding decision at each ______ within the network. The forwarding decision is based solely on the destination ______ IP address. All packets for the same destination follow the same path across the network if no other equal-cost ______ exist. Whenever a router has two equal-cost paths toward a destination, the packets toward the destination might take one or both of them, resulting in some degree of load sharing. Enhance Interior Gateway Routing Protocol(EIGRP) also supports non-equal-cost ______ sharing although the default behavior of this protocol is equal-cost. You must configure EIGRP variance for non-equal-cost load balancing.