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module is responsible to ensure authorized, authenticated and accountable access to
resources across hybrid clouds. Finally, the inter-cloud messaging bus is employed to
integrate all participating components into an integrated media application.
6 Analysis of CCDNs Current State-of-the-Art
As mentioned in the previous section, most commercial CCDNs follow an identical
architecture. In the previous section, we presented some of the most popular commercial
CCDN architectures and a few academic CDNs. In this section, we will present a
twofold comprehensive analysis of commercial CCDNs based on services offered and
research dimensions. The services analysis is based on the following characteristics
(1) target audience; (2) services; (3) technology and characteristics. The research
dimensions used for analysis presented in Sect. 3 are (1) Hybrid cloud support; (2)
Content creation and management; (3) Content personalization; (4) Quality of Service;
(5) Indexing; (6) Cloud Selection; (7) Content Type. For academic CCDNs we only
focus on the research dimensions (Tables 2 and 3 ).
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