
367Advanced Concepts in Cloud Computing
• Multicloud: Multicloud involves two or more cloud service providers
(see Section 14.1).
• Peer-to-peer intercloud federation: This is one of the types of cloud fed-
eration where there is no central entity (see Section 14.1).
• Centralized intercloud federation: This is a type of cloud federation that
involves a central entity (see Section 14.1).
• Precision air conditioners: These are the type of air conditioners used
for cooling in data centers (see Section 14.8).
• OPerational EXpenses (OPEX): OPerational EXpenses is the ongoing
cost for running a product, business, or system (see Section 14.8).
• ...