1.8 Software Defined Networking Flashcards
N10-009 Obj. 1.8 Summarize evolving use cases for modern network environments. (11 cards)
What are the three planes of networking?
The data plane (infrastructure), control plane, and management plane.
Transcript: “We would see there was a data plane, a control plane, and a management plane.” (0:24–0:29)
What is the role of the data plane in networking?
It handles forwarding traffic, trunking, encryption, and NAT—moving data from one interface to another.
Transcript: “It does the forwarding of traffic… forwarding, trunking, encrypting, and network address translation.” (1:10–1:20)
What is the function of the control plane?
It contains routing, switching, and NAT tables—defining how data should be forwarded.
Dynamic routing protocol updates
Transcript: “Routing tables, switching tables, network address translation tables… located in the control plane.” (1:34–1:43)
What does the management plane do?
It allows administrators to configure and manage devices via SSH or web interfaces or API
Transcript: “Any time you SSH into a console or control a device from a web-based front end…” (1:54–1:59)
What is SD-WAN?
Software-Defined Wide Area Networking—a WAN architecture built for managing cloud-based resources dynamically.
Transcript: “This stands for Software-Defined Networking in a Wide Area Network… built to manage the complexities of a cloud-based environment.” (3:05–3:19)
Why was SD-WAN developed?
Because cloud services are distributed and dynamic, requiring flexible,** application-aware** WAN routing.
Transcript: “It’s now not quite as simple as connecting to a central data center… SD-WAN was created because we needed… application aware.” (3:45–4:47)
What is zero-touch provisioning in SD-WAN?
It allows devices to auto-configure and adapt when cloud resource locations or network settings change.
Transcript: “This is called zero-touch provisioning… our SD-WAN routers will automatically update themselves…” (5:15–5:45)
What does it mean that SD-WAN is transport agnostic?
It can use any connectivity type—fiber, 5G, DSL—to connect to cloud services.
Transcript: “SD-WAN is designed to be agnostic to the transport type…” (6:02–6:08)
What is the benefit of centralized policy management in SD-WAN?
It allows admins to configure policies in one place and push them to all routers automatically.
Transcript: “We have central policy management… changes are pushed out to all of those SD-WAN routers automatically.” (6:17–6:24)
Can SD-WAN route traffic to both data centers and cloud services?
Yes, it enables access to both, depending on where the resource is located.
Transcript: “Those locations can still go directly to the data center… or go directly to that cloud-based service using this SD-WAN technology.” (6:30–6:43)
What is Software-Defined Networking (SDN) and how does it improve on traditional networks?
SDN separates the data, control, and management planes, allowing network control to be handled programmatically via software rather than through individual hardware devices. This makes networks more flexible, scalable, and easier to manage. Perfect for cloud networking.
Transcript: “If we could take those individual functions… and create virtualized software versions… we would be able to deploy this nearly anywhere… and give us additional functionality…” (0:32–0:52)
