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The term "WAN aggregation" specifically refers to the process of combining resources and bandwidth from multiple WAN links to optimize performance and efficient resource utilization across a Wide Area Network. This aggregation allows for improved reliability, greater throughput, and enhanced load balancing among various connected sites or networks. In a WAN environment, where multiple connections may exist, aggregation ensures that the available bandwidth is effectively pooled, which can help manage more significant traffic loads seamlessly.

In contrast, options like an Internet gateway typically refer to a node that serves as an access point between two networks, like a local area network (LAN) and the wider internet, but does not specifically address the concept of resource aggregation. The term "core network" generally refers to the centralized part of a telecommunications network that provides various services to customers who are connected by the access network, but this doesn’t directly relate to the aggregation of resources. A distributed system involves multiple components located on different networked computers that communicate and coordinate their actions, which is distinct from the notion of resource aggregation in WAN contexts. Thus, "WAN aggregation" is the most precise term for describing the combining of resources in a WAN environment.