Ccna Automation

They use protocols such as SNMP and NetFlow to gather information and report on the state of the network

Python scripts, NETCONF, RESTCONF, Ansible, Puppet, SDN, CiscoDNA Center etc.

Git is a version control system for tracking changes in source code and files

GitHub is a Git repository hosting service which adds many of its own features

CI is Continuous Integration CD is Continuous Deployment CI/CD is a set of operating principles and practices that enable application development teams to deliver code changes more frequently and reliably

Data serialization is the process of converting structured data to a standardized format that allows sharing or storage of the data in a form that allows recovery of it original structure

JSON, XML, YAML

White Space No Meaning Often used by RESTful APIs

- Unordered set of name/value pairs - Enclosed in curly braces { } - Value and key separated by : - Key value pairs separated by commas - Keys must be strings, and value

an ordered list of values They are surrounded by square brackets [ ]

Sring: "name":"GigabitEthernet1" Number: "Input Errors" : 3 Boolean: "enabled" : true Null: "msec" : null

White space has no special meaning in XML <key>value</key> contained within object tags

White space (indentation) is important Starts with --- key: value representation - indicates a list

An API is a way for a computer program to communicate directly with another computer program

REST, SOAP, NETConf, RESTconf

Create, Read, Update, Delete

The transport is typically HTTP(S), and the data format is always XML Because it is a protocol it has strict standards to adhere to

HTTP(S) transport and JSON (or XML) data format are commonly used REST is an architecture, not a protocol It typically has faster performance and is easier to work with than SOAP

- Client-server architecture: the client sends a request, the server sends a response - Uniform Interface: provides simplicity - Statelessness: no client context is stored on the server between requests - Cacheability: responses must define themselves as either cacheable or non-cacheable - Layered system: any intermediary devices such as load balancers must be transparent to the client and server

demo.flackbox.com/api/running/aaa/users/niel?dryrun demo.flackbox.com - Target Host /api/running/aaa/users/niel - Resource ?dryrun - Parameters

1xx - informational 2xx - Success 3xx - Redirection 4xx - Client Error 5xx - Server Error

data modeling language which provides a standardized way to represent the operational and configuration data of a network device

NetConf, RESTConf, gRPC

used to test APIs

Can automate the provisioning and deployment of servers and network devices

Angentless Push Model YAML python

Agent Pull Model

Agent Pull Model

Where the router passes data

Where the router makes decision on packet handling

Where the device is configured and monitored

The network infrastructure devices are still responsible for forwarding traffic, but the control plane moves to a centralized SDN controller Rules for packet handling are sent to the network infrastructure devices from the controller

With a pure SDN the control plane runs purely on an SDN controller, and the data plane runs purely on the network devices With a hybrid SDN the majority of the control plane intelligence is provided by an SDN controller, but the network devices retain some control plane intelligence as well as the data plane operations

Application Layer: SDN Application Northbound API: REST Control Layer: SDN Controller Southbound API: OpenFlow, SNMP, REST, NETCONF, SSH Infrastructure Layer: Device

Intent Based Networking transforms a traditional manual network into a controller led network that translates the business needs into policies that can be automated and applied consistently across the network

Application Layer: SDN Application Northbound API: REST Control Layer: DNA Center Southbound API: NETCONF, SSH Infrastructure Layer: Device