Abstract
Many Internet applications are used to access resources, such as
pieces of information or server processes that are available in several
equivalent replicas on different hosts. This includes, but is not limited
to, peer-to-peer file sharing applications. The goal of Application-Layer
Traffic Optimization (ALTO) is to provide guidance to applications that
have to select one or several hosts from a set of candidates capable of
providing a desired resource. This guidance shall be based on parameters
that affect performance and efficiency of the data transmission between
the hosts, e.g., the topological distance. The ultimate goal is to improve
performance or Quality of Experience in the application while reducing the
utilization of the underlying network infrastructure.
This document enumerates requirements for specifying, assessing, or
comparing protocols and implementations.
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