SDN Flashcards
SDN centralizes the control plane into an application called a _____
controller
What are the three layers of SDN architecture?
- Application layer
- Control layer
- Infrastructure layer
What is the purpose of the SDN application layer?
Contain scripts/applications that tell the SDN controller what network behaviors are desired
What is the purpose of the SDN control layer?
Receive and process instructions from the application layer
What is the purpose of the SDN infrastructure layer?
Holds the actual network devices that are responsible for forwarding messages across the network
What is Cisco’s solution for automating campus LANs?
SD-Access
Cisco DNAC is the ____ for SD-Access
Controller
The ____ is the underlying physical network of devices and connections which provide IP connectivity
Underlay
The _____ is the virtual network built on top of the physical underlay network
Overlay
The _____ is the combination of the underlay and the overlay; the physical and virtual network as a whole
Fabric
Describe what the SD-Access Underlay is
The underlying physical network of devices and connections which provide IP connectivity
Describe what the SD-Access Overlay is
The virtual network that is built on top of the physical underlay network
What does SD-Access use to build tunnels in the underlay?
VXLAN
Virtual Extensible LAN
What is the purpose of the SD-Access underlay?
Support the VXLAN tunnels of the overlay
What are the three diferent roles for switched in SD-Access
- Edge nodes
- Border nodes
- Control nodes
What is an SD-Access edge node?
Switch that connects to end hosts
What is an SD-Access border node?
Switch that connects to devices outside of the SD-Access domain, e.g. WAN routers
What is an SD-Access control node?
Uses LISP (Locator ID Seperation Protocol) to perform various control plane functions
What is a brownfield deployment?
Adding SD-Access on top of an existing network, where hardware and software support it
What is a greenfield deployment?
A brand new deployment of SD-Access, where the underlay will be configured by DNAC for optimal SD-Access operation
____ provides the control plane of SD-Access
LISP
In LISP, a mapping of _____ to _____ is kept
EIDs (endpoint identifiers) to RLOCs (routing locators)
What do EIDs identify?
Hosts connected to edge switches
What do RLOCs identify?
The edge switch which can be used to reach the end host
What provides SD-Access policy control?
Cisco TrustSec (CTS)
What provides the data plane of SD-Access
VXLAN
What are the two roles of Cisco DNAC?
- SDN controller in SD-Access
- Network manager in a traditional network (non-SD-Access)
DNAC is an app installed on what?
Cisco UCS server hardware
Which of the following terms describes the network of devices and physical connections?
a) Underlay
b) Fabric
c) Overlay
d) Tunnel
a) Underlay
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
b) Application
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+
b) All links between switches are L3
Which protocol is used to create virtual tunnels in the SD-Access overlay?
a) LISP
b) IPsec
c) GRE
d) VXLAN
d) VXLAN
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) Control node
c) Border node
d) Edge node
What is the name of Cisco’s SDN management solution that is typically installed on a desktop work station?
Cisco Network Assistant
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
c) SSH
e) SNMP
The control plane is centralized in a controller based network. Neither of these are part of the control plane
