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CCNA > SDN > Flashcards

SDN Flashcards

1
Q

SDN centralizes the control plane into an application called a _____

A

controller

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2
Q

What are the three layers of SDN architecture?

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

What is the purpose of the SDN application layer?

A

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

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4
Q

What is the purpose of the SDN control layer?

A

Receive and process instructions from the application layer

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5
Q

What is the purpose of the SDN infrastructure layer?

A

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

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6
Q

What is Cisco’s solution for automating campus LANs?

A

SD-Access

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7
Q

Cisco DNAC is the ____ for SD-Access

A

Controller

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8
Q

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

A

Underlay

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9
Q

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

A

Overlay

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10
Q

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

A

Fabric

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11
Q

Describe what the SD-Access Underlay is

A

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

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12
Q

Describe what the SD-Access Overlay is

A

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

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13
Q

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

A

VXLAN

Virtual Extensible LAN

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14
Q

What is the purpose of the SD-Access underlay?

A

Support the VXLAN tunnels of the overlay

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15
Q

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

A
  1. Edge nodes
  2. Border nodes
  3. Control nodes
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16
Q

What is an SD-Access edge node?

A

Switch that connects to end hosts

17
Q

What is an SD-Access border node?

A

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

18
Q

What is an SD-Access control node?

A

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

19
Q

What is a brownfield deployment?

A

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

20
Q

What is a greenfield deployment?

A

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

21
Q

____ provides the control plane of SD-Access

A

LISP

22
Q

In LISP, a mapping of _____ to _____ is kept

A

EIDs (endpoint identifiers) to RLOCs (routing locators)

23
Q

What do EIDs identify?

A

Hosts connected to edge switches

24
Q

What do RLOCs identify?

A

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

25
Q

What provides SD-Access policy control?

A

Cisco TrustSec (CTS)

26
Q

What provides the data plane of SD-Access

A

VXLAN

27
Q

What are the two roles of Cisco DNAC?

A
  1. SDN controller in SD-Access
  2. Network manager in a traditional network (non-SD-Access)
28
Q

DNAC is an app installed on what?

A

Cisco UCS server hardware

29
Q

Which of the following terms describes the network of devices and physical connections?

a) Underlay
b) Fabric
c) Overlay
d) Tunnel

A

a) Underlay

30
Q

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

A

b) Application

31
Q

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+

A

b) All links between switches are L3

32
Q

Which protocol is used to create virtual tunnels in the SD-Access overlay?

a) LISP
b) IPsec
c) GRE
d) VXLAN

A

d) VXLAN

33
Q

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

A

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

34
Q

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

A

Cisco Network Assistant

35
Q

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

A

c) SSH
e) SNMP

The control plane is centralized in a controller based network. Neither of these are part of the control plane

36
Q
A

CCNA (38 decks)

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