SDN Lecture Flashcards

1
Q

SDN Provides 3 things

A
  1. Network-Wide Views
    - topology
    - traffic
  2. Network-Level Objectives
    - load balancing
    - security
  3. Direct Control
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2
Q

Where is the “state” represented on routers?

A

Routing Table

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3
Q

Where does the control plane logic live in an SDN?

A

In a centralized “controller”. Not on the routers individually.

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4
Q

2 defining characteristics of SDN

A

The logic for routing is in a “controller”. So that means the 2 characteristics are:

  1. Logically Centralized Control
  2. Network-Wide Control
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5
Q

SDN Downsides/Challenges: Scalability

A

Each controller can be responsible for thousands of switches

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6
Q

SDN Downsides/Challenges: Consistency

A

Need to make sure each controller has the same view of the network as all other controllers

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