SDN Lecture Flashcards
1
Q
SDN Provides 3 things
A
- Network-Wide Views
- topology
- traffic - Network-Level Objectives
- load balancing
- security - Direct Control
2
Q
Where is the “state” represented on routers?
A
Routing Table
3
Q
Where does the control plane logic live in an SDN?
A
In a centralized “controller”. Not on the routers individually.
4
Q
2 defining characteristics of SDN
A
The logic for routing is in a “controller”. So that means the 2 characteristics are:
- Logically Centralized Control
- Network-Wide Control
5
Q
SDN Downsides/Challenges: Scalability
A
Each controller can be responsible for thousands of switches
6
Q
SDN Downsides/Challenges: Consistency
A
Need to make sure each controller has the same view of the network as all other controllers
