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SDN uses virtualization, but is not MOSTLY composed of VMs. SDN is modelled as a set of client-server relationships with the SDN controller at its core.
https://safe.menlosecurity.com/doc/docview/viewer/docNC2DBDD5FD5C050a8f26ba6bbb1be40d084fa0902dd66838758e41d2675edfd35731a53f565ce
wanted to add that Network virtualization is different than SDN virtualization. You CAN configure an SDN to set up virtual machines and server clusters, but the core of an SDN is still physical devices.
OSG - Virtualization extends beyond just servers and networking. Software-defined everything
(SDx) refers to a trend of replacing hardware with software using virtualization.
C. The SDN is mostly composed of virtual machines (VM)
A Software-defined Network (SDN) is a network architecture that uses software to abstract the underlying physical network infrastructure and provide programmability, flexibility, and control over the network resources.
In order to build a SDN, it is necessary to have the network infrastructure composed mostly of virtual machines (VMs) or virtual network functions (VNFs) that are running on top of a physical infrastructure, these VMs or VNFs are the building blocks for the SDN. These virtualized components can be easily moved, scaled, and managed, providing the flexibility and programmability required for a SDN.
D.
C. The SDN is mostly composed of virtual machines (VM). - This is wrong statement. SDN has 3 layers and VM is not one of them.
a) an infrastructure layer
b) a control layer and
c) an application layer.
SDN technology combined with virtual machines and virtualization of networks provides efficiencies to service providers as well.
https://www.ibm.com/cloud/blog/software-defined-networking
SDN technology combined with virtual machines and virtualization of networks provides efficiencies to service providers as well. With these resources, they can provide distinct network separation and control to customers.
https://www.ibm.com/cloud/blog/software-defined-networking
The benefits of DCO may include reduced operational costs, more efficient use of infrastructure, and access to more server, storage or computing capacity on demand. The risks include lack of control over security and disaster recovery, lack of flexibility, problems with SLA fulfillment and vendor lock-in.
Given answer is the best, not a good question (agree with GregP). vManage – Management Dashboard.
vEdge – The edge router at branches.
vBond – The Orchestrator.
vSmart – The Controller.
Most of them are VMs.
C seems no be right, because you have VM for the controller and other elements but you have a lot of switch and routers and they are physical appliances.
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