Intro to Network Programmability Flashcards
define SDN
- decoupling of data and control plane
- intelligence and state info centralized
- underlaying infrastructure is abstracted (i.e. network virtualization)
- leveraging APIs
what SDN is not
- an easy button
- end state
- designed to replace engineers
- mandate for everyone to become coders
- revolution of networking (old concepts)
SDN offers
new ways of managing, building and operating networks
the planes of traditional networks are…
- data - traffic
- control - routing protocols
- management - management protocols like SSH and SNMP
in traditional networks all planes are located where..
within a single device
where are the planes located in SDN “purist” model
control planes is centralized, data plane is de-centralized / per device
what is hybrid SDN
control plane is partly on devices and partly on controllers
what is the biggest problem of SDN “purist” model
control plane scalability
why SDN is needed
- device by device configuration is inefficient
- faster execution with reduced errors
- single point of management
name current industry trends
- open source software
- APIs
- SDN
- DevOps
- Application centric networking
what is open source software
software developed by a community that is free to use under GNU license
what are the benefits of open source software
highly customizable, lower capex and thus flexibility
what network programmability seeks
reduced human to machine interaction by utilizing APis
what is DevOps
a cultural trend for more agility and better quality in product development and maintenance
what tools DevOps culture claims to give
better automation and configuration management tools
what is Openflow
- came from Stanford
- imperative control over FIB tables
- a protocol between switches and controllers
what is Contiv
provides operating policy for container based applications
what is FD.io
- accelerates NFV data planes
- vector packet processing
what is OvS
- opensource virtual switch
- supports Openflow and OVSDB
what is Openstack
- opensource IaaS / cloud compute solution
- collection of APIs
- Neutron plugin provides networking
what is Open Daylight
- opensource SDN controler
define goals of open source networking software
- open access to the underlying OS
- community involvement in continuous improvement
- open APIs
- open protocol standards
list on-box scripting and automation methods
TCL, EEM, Power on Auto Provisioning (NX-OS), Python, Smart Install, Smartport Macros
list off-box capabilities of modern programmable devices
REST, NETCONF, RESTCONF, SDK, Linux, DevOps (automation) tools
REST APIs characteristics
client-server, use HTTP(s) transport, stateless, resource based, use nouns instead of verbs
what is an SDK
software development kit allows the user to create their custom applications
what is SW-Only Network Virtualization
Software-Only Network Virtualization solutions offer a native software-only approach that builds overlay tunnels among hypervisors in the data center.
what are the drawbacks of SW-Only Network Virtualization
- no support for physical workloads
- performance limitations
what CALMS stands for
- Culture
- Automation
- Lean
- Measurement
- Sharing
three goals of DevOps are
- increase deployment frequency
- faster time-to-market
- reduce errors / failure rate
characteristics of DevOps culture
- Workplace trust
- Respect
- Collaboration
- Shared goals
- Being supportive
- A sense of no blame/no victims
what does the current network operation look like
- CLI used manually
- Configuration is one device at a time
- Copying and pasting
- Configuration errors
- Tasks not repeatable
- Notepad automation
what does an automated network operation look like
- Version control for monitoring changes
- Version control is the source of the truth
- Unit and integration testing before changes are deployed
what are the types of network automation
- Device Provisioning
- Data Collection & Telemetry
- Compliance Checks
- Reporting
- Troubleshooting
what happens in compliancy checks
auditing large amount of devices for configuration issues and automatically fixing them assisted by regression testing
list traditional methods of managing a network device
telnet, SSH, SNMP
list programmable methods of managing a network devices
NX-API, REST, RESTCONF, NETCONF, gRPC, SOAP
supported APIs on IOS-XE
RESTCONF, NETCONF
supported APIs on IOS-XR
RESTCONF, NETCONF, gRPC
supported APIs on NX-OS
NX-API CLI, NX-API REST, NETCONF
supported API on ASA, ACI and APIC-EM
REST
