How do applications in the application plane interact with the SDN controller?

By using southbound APIs like OpenFlow

By directly modifying switch flow tables

By sending packets through the data plane

In an SDN network, a switch receives a packet that matches an existing flow entry. What does the switch do?

It sends the packet to the controller for a new decision.

It updates the flow entry with a new action.

It drops the packet and logs an error.

It forwards the packet according to the action specified in the flow entry.

In SDN, northbound APIs are used for communication between which two entities?

Applications and the controller

Controllers and other controllers

In an SDN network, a switch experiences a high rate of packets that do not match any flow entry. This causes the switch to send many packets to the controller, leading to increased latency. What is the most effective way to reduce this controller overhead?

Increase the switch's buffer size to hold more packets.

Use a slower controller to reduce processing speed.

Disable the southbound API to prevent communication.

Install proactive flow entries for expected traffic patterns.

Juniper NetworksCertified Associate, Cloud

Domain 2Objective 4

SDN Architecture JN0-214 Practice Questions (Page 4)

Part of the Cloud Infrastructure (NFV and SDN) domain, which makes up ~19% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~7–11 in this domain), expect 1–2 from this objective — we provide 32 practice questions to prepare you well beyond it. (estimate)

32questions here

7free pages

8concepts

Questions 16–20

16foundation · easy
How do applications in the application plane interact with the SDN controller?
Select an answer first
17application · medium
In an SDN network, a switch receives a packet that matches an existing flow entry. What does the switch do?
Select an answer first
18foundation · easy
In SDN, northbound APIs are used for communication between which two entities?
Select an answer first
19expert · hard
In an SDN network, a switch experiences a high rate of packets that do not match any flow entry. This causes the switch to send many packets to the controller, leading to increased latency. What is the most effective way to reduce this controller overhead?
Select an answer first
20foundation · easy
In the Software-Defined Networking architecture, which layer is responsible for making forwarding decisions and is logically centralized?
Select an answer first

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