ABSTRACT
Cloud-based applications rely on virtual network services for communication between distributed application software components (VNFCs), functional components offered as a service and supporting systems, along with wide area and access networking to communicate with end users' devices. User service quality is vulnerable to the following virtual networking risks: packet loss risk; packet delay risk; packet jitter risk; network delivered throughput risk; network outage risk; and VN diversity compliance violation risk. Packet Delay is the elapsed time between a packet being sent from one VNFC's guest OS instance to the time it is received by the destination VNFC's guest OS instance. Packet Delay Variation is the variance in packet delay. This chapter offers a simple example of how virtual network risks confronting cloud service customers is related to how application service components are placed onto physical infrastructure equipment.
