Software Defined Networking - CompTIA A+ 220-1101 - 2.2

The Impact of Cloud Computing on Networking

This section discusses how cloud computing has changed networking and introduces Software Defined Networking (SDN) as a solution for virtualizing network infrastructure in the cloud.

Introduction to Cloud Computing and SDN

• Cloud computing has transformed networking by replacing physical infrastructure with virtualized platforms.

• Software Defined Networking (SDN) enables the use of software-based versions of switches, routers, firewalls, and other networking devices in the cloud.

Three Layers of SDN

• SDN separates devices into three layers: infrastructure layer (data plane), control layer (control plane), and application layer (management plane).

• The infrastructure layer handles forwarding, trunking, encryption, and other packet-level operations.

• The control layer contains dynamic routing protocols, forwarding tables, network address translation tables, etc.

• The application layer provides access to manage the device through APIs or graphical interfaces.

Applying SDN to Physical Devices

This section explains how SDN can be applied to physical devices such as switches, routers, or firewalls by virtualizing the data plane, control plane, and management plane.

Virtualization of Data Plane

• In a physical device like a switch, traffic forwarding occurs in the data plane.

• With SDN, a software version of the data plane is created to handle traffic forwarding between different interfaces.

Virtualization of Control Plane

• The control plane manages dynamic routing protocols and maintains tables for forwarding.

• In an SDN environment, this functionality is separated from the physical device and implemented as a software-based control plane.

Virtualization of Management Plane

• Device management is typically done through console ports or management interfaces.

• In SDN, this aspect is virtualized as the management plane where administrators can access devices using SSH or APIs.

Modular Architecture of SDN

This section explores how SDN creates a modular architecture by extending the data plane, control plane, and management plane across multiple networking devices.

Modular Layers in SDN

• SDN allows communication between devices at the data plane layer, ensuring traffic traverses different devices seamlessly.

• The control plane handles dynamic routing protocols and forwarding tables across devices.

• The management plane provides access to manage devices through secure shell, SNMP, or APIs.

Benefits of Software Defined Networking

• SDN offers a software-based version of network devices that can be deployed and used in cloud-based environments.

• It enables the creation of new devices or extensions between existing ones based on the modular architecture.

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