Understanding Cloud Computing and Network Virtualization

The term “network virtualization” (NV) refers to the abstraction of network resources from hardware and into software. One physical network may be split into numerous independent virtual networks by NV, or numerous physical networks may be combined into a single virtual, software-based system.


Network managers can move virtual machines between domains using network virtualization technology without reconfiguring the network. On top of the same physical network infrastructure, the software builds a network layer that allows for the operation of many virtual network layers.


Why Virtualize your Network?


The regulations for providing services are being rewritten by network virtualization, from the software-defined data center (SDDC) to the clouds to the edges. This method transforms networks from static, rigid, and ineffective to dynamic, adaptable, and effective. Sophisticated systems must be able to give the speed and agility you require for a quicker time to market for your apps while keeping up with the requirements for dispersed, cloud-hosted apps and the growing dangers posed by cybercriminals. Due to network virtualization, you can forget about expending days or weeks deploying the infrastructure needed to support a new app. For a quick time to value, applications can be updated or deployed in minutes.


The Operation of Network Virtualization


Virtualization software enables the virtual deployment of a full network and decouples network functions from the actual hardware. It enables the use of the fundamental physical network as the packet-forwarding backplane while enabling programmatic creation, provisioning, and management of networks completely within the software. Switching, routing, firewalling, load balancing, virtual private networks, and other physical network packets are bundled and supplied in software. The underlying physical network is needed to forward Internet Protocol (IP) packets.


According to the networking and privacy regulations established for each linked app, network and security services are deployed to a virtual layer (hypervisors, in the data center) and “connected” to specific workloads, like your containers or virtual machines (VMs). Network services and security regulations are transferred with a workload when relocated to a different host. Additionally, essential rules are automatically applied to new workloads developed to scale an app, enhancing policy consistency and network flexibility.


Advantages of Network Virtualization


By streamlining and automating several operations involved in running a data center network and controlling networking and safety in the cloud, network virtualization aids enterprises in achieving significant improvements in speed, agility, and security. The following are a few of the main advantages of network virtualization:



• Decrease the duration of network provisioning from weeks to minutes
• Automate manual operations to increase operational efficiency
• Workloads can be moved and placed regardless of the physical topology.
• Enhance data center network security

Examples of Network Virtualization


Virtual LAN is an illustration of network virtualization (VLAN). A virtual local area network (VLAN) is a portion of a local area network (LAN) that uses software to join together network devices, notwithstanding their actual locations. Busy connections can function better and faster due to VLANs, making adding or updating the network easier.


Networking overlays are yet another instance. Different overlay technologies exist. A virtual extensible local area network is one of the technologies that is widely used (VXLAN). Layer 3 networks can be overlaid with virtualized layer 2 networks using the framework provided by VXLAN, which also defines an encapsulation method and a control plane. Another one is generic network virtualization encapsulation (GENEVE), which uses the same ideas but expands their applicability by being adaptable to other control plane techniques.


Network Virtualization Tools


Physical switch OS: This is the OS that must support network virtualization.


Hypervisor: A device that implements network virtualization features using either built-in connectivity or third-party software.


The OS’s fundamental job is to provide a straightforward set of instructions to the program or process that is currently running. Like the service primitives provided at the application and network interface through the SAP(Service Access Point), system calls are created by the OS and implemented through the libc library.


Use the hypervisor to build a virtual switch and set up virtual networks on it. The hypervisor’s inherent networking capabilities are replaced by the third-party software deployed on the hypervisor. Due to a hypervisor, we can have several virtual machines (VMs) running efficiently on a single piece of computing hardware.


Features of Network Virtualization



• It permits the functional division of nodes into groups in a virtual network.
• It makes it possible for the virtual network to pool network resources.
• Without the need for frame routing, it permits communication between nodes in a virtual network.
• Management traffic is constrained.
• For inter-virtual network communication, it enforces routing.

Virtual Data Center Network Virtualization


Real Network



• Network adapters, switches, bridges, repeaters, routers, and hubs are tangible examples of components.
• provides communication between real servers running a hypervisor, as well as between physical servers and storage technologies and consumers.

VM Network



• Virtual switches make up.
• Connects you to the hypervisor kernel.
• Connects to the actual network.
• It is located inside the actual server.

Benefits of Network Virtualization in Cloud Computing


Enhanced manageability



• Node grouping and regrouping are made easier.
• Using management software, VM configuration is possible from a centralized management workstation.

Decreases CAPEX



• There is less need to configure distinct physical networks for each node grouping.

Enhances Utilization



• The ability for multiple VMs to share a single physical network improves network resource consumption.

Improves Performance



• Network broadcast is limited, and virtual machine performance is enhanced.

Increases Security



• Sensitive data is not transferred from one VM to another.
• A VM restricts access to its nodes from another VM.

Problems with Network Virtualization



• It must manage IT agnostically.
• In a hybrid system with cloud integration, it must live alongside physical devices.
•Complexity growth.
• Initial price.
• An eventual learning curve.

Network virtualization Applications



• The advancement of application testing may use network virtualization to simulate real-world systems and hardware software.
• We can combine numerous physical connections into a single network or divide a single physical network into multiple analytical networks with its assistance.
• Network virtualization enables the modeling of connections across apps, resources, dependencies, and end-users for the testing process in system performance engineering.
• We can launch apps more quickly thanks to it, supporting a quicker go-to-market.
• Network virtualization enables software test engineers to generate accurate findings in a networked environment with anticipated instances and congestion problems.

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