Isolation Domains (ISDs)
This chapter discusses SCION isolation domains in more detail. As briefly sketched in Chapter 2, an isolation domain (abbreviated as ISD to distinguish it from the common abbreviation ID) constitutes a logical clustering of the Internet’s most coarse-grained organizational unit, namely that of an autonomous system, or AS for short. An AS is a self-contained network administrated by a single entity (e.g., by an Internet service provider (ISP) or a university) and communicates with other ASes through well-defined interfaces based on contractual business relations. Figure 2.1 on Page 18 sketches how ASes are grouped into ISDs.
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