SDN

Question 1

SDN centralizes the control plane into an application called a _____

Answer 1

controller

Question 2

What are the three layers of SDN architecture?

Answer 2

1. Application layer
2. Control layer
3. Infrastructure layer

Question 3

What is the purpose of the SDN application layer?

Answer 3

Contain scripts/applications that tell the SDN controller what network behaviors are desired

Question 4

What is the purpose of the SDN control layer?

Answer 4

Receive and process instructions from the application layer

Question 5

What is the purpose of the SDN infrastructure layer?

Answer 5

Holds the actual network devices that are responsible for forwarding messages across the network

Question 6

What is Cisco’s solution for automating campus LANs?

Answer 6

SD-Access

Question 7

Cisco DNAC is the ____ for SD-Access

Answer 7

Controller

Question 8

The ____ is the underlying physical network of devices and connections which provide IP connectivity

Answer 8

Underlay

Question 9

The _____ is the virtual network built on top of the physical underlay network

Answer 9

Overlay

Question 10

The _____ is the combination of the underlay and the overlay; the physical and virtual network as a whole

Answer 10

Fabric

Question 11

Describe what the SD-Access Underlay is

Answer 11

The underlying physical network of devices and connections which provide IP connectivity

Question 12

Describe what the SD-Access Overlay is

Answer 12

The virtual network that is built on top of the physical underlay network

Question 13

What does SD-Access use to build tunnels in the underlay?

Answer 13

VXLAN

Virtual Extensible LAN

Question 14

What is the purpose of the SD-Access underlay?

Answer 14

Support the VXLAN tunnels of the overlay

Question 15

What are the three diferent roles for switched in SD-Access

Answer 15

1. Edge nodes
2. Border nodes
3. Control nodes

Question 16

What is an SD-Access edge node?

Answer 16

Switch that connects to end hosts

Question 17

What is an SD-Access border node?

Answer 17

Switch that connects to devices outside of the SD-Access domain, e.g. WAN routers

Question 18

What is an SD-Access control node?

Answer 18

Uses LISP (Locator ID Seperation Protocol) to perform various control plane functions

Question 19

What is a brownfield deployment?

Answer 19

Adding SD-Access on top of an existing network, where hardware and software support it

Question 20

What is a greenfield deployment?

Answer 20

A brand new deployment of SD-Access, where the underlay will be configured by DNAC for optimal SD-Access operation

Question 21

____ provides the control plane of SD-Access

Answer 21

LISP

Question 22

In LISP, a mapping of _____ to _____ is kept

Answer 22

EIDs (endpoint identifiers) to RLOCs (routing locators)

Question 23

What do EIDs identify?

Answer 23

Hosts connected to edge switches

Question 24

What do RLOCs identify?

Answer 24

The edge switch which can be used to reach the end host

Question 25

What provides SD-Access policy control?

Answer 25

Cisco TrustSec (CTS)

Question 26

What provides the data plane of SD-Access

Answer 26

VXLAN

Question 27

What are the two roles of Cisco DNAC?

Answer 27

1. SDN controller in SD-Access 2. Network manager in a traditional network (non-SD-Access)

Question 28

DNAC is an app installed on what?

Answer 28

Cisco UCS server hardware

Question 29

Which of the following terms describes the network of devices and physical connections? a) Underlay b) Fabric c) Overlay d) Tunnel

Answer 29

a) Underlay

Question 30

In which of the following layers would you expect to find scripts that interact with the controller? a) Infrastructure b) Application c) REST d) Control

Answer 30

b) Application

Question 31

Which of the following is a characteristic of an optimal SD-Access underlay network as configured by DNA-Center a) All switches are L3 and use OSPF as their routing protocol b) All links between switches are L3 c) An FHRP is used to provide a redundant default gateway for end hosts d) All links between switches run Cisco proprietary Rapid-PVST+

Answer 31

b) All links between switches are L3

Question 32

Which protocol is used to create virtual tunnels in the SD-Access overlay? a) LISP b) IPsec c) GRE d) VXLAN

Answer 32

d) VXLAN

Question 33

Which of the following are valid switch roles in Cisco SD-Access? (pick many) a) Control node b) Management node c) Border node d) Edge node

Answer 33

a) Control node c) Border node d) Edge node

Question 34

What is the name of Cisco's SDN management solution that is typically installed on a desktop work station?

Answer 34

Cisco Network Assistant

Question 35

In a controller based network, which of the following are least likely to be moved to a central controller? a) EIGRP b) OSPF c) SSH d) BGP e) SNMP

Answer 35

c) SSH e) SNMP The control plane is centralized in a controller based network. Neither of these are part of the control plane