CCNA 7.7.c: Northbound and southbound APIs

In Software Defined Networking (SDN), Northbound and Southbound APIs are used to describe how interfaces operate between the different planes – data plane, control plane and application plane.   Southbound interfaces define the way the SDN controller should interact with the data plane (aka forwarding plane) to make adjustments to the network, so it can […]

CCNA 7.7.b: Separation of control plane and data plane

In conventional networks, routers, switches, firewalls and other devices tightly couple the control  plane and the data plane on a single device.  Software Defined Networking (SDN) introduces the concept of separating the control plane and data plane.  The data plane remains on each device (physical and virtual) for quick, efficient forwarding of data.  The control […]

CCNA 7.7.a: Function of a controller

In Software Defined Networking (SDN), the control plane is on a single device – the controller. The controller is typically a virtual server loaded with open source SDN controller software.  The communications between the controller and the network devices typically uses a standardized protocol, i.e. OpenFlow.  The communications between the controller and the applications use […]

CCNA 7.7: Describe network programmability in enterprise network architecture

Network programmability or Software Defined Networking (SDN), as the name implies, moves the brains of the network from individual hardware devices that use IOS to a centralized controller that uses open source code.  This provides a central point of management for all devices on the network, which leads to greater automation and more efficient orchestration […]

CCNA 7.6.d: Local SPAN

Overview: Local Switched Port Analyzer (SPAN) lets you monitor traffic on one or more ports, or one or more VLANs, and send the monitored traffic to one or more destination ports   Study Notes: SPAN monitors traffic from interface sources and sends traffic to destination interfaces SPAN sources can be Ethernet, port-channels or VLANs When […]

CCNA 7.6.c: Log events

Overview: The logging event command lets you monitor interface state-change events as they occur on the router   Study Notes:   logging event bundle-status Enables system logging of interface state-change events on all interfaces on the system Router(config)#logging event bundle-status Router(config)#end Router#show logging event bundle-status Router#config t Router(config)#no logging event bundle-status   logging event link-status […]

CCNA 7.6.b: Terminal monitor

Overview: The terminal monitor command is used to display debug and system error messages to the current terminal session   Study Notes: The terminal monitor command is used to display debug and system error messages to the current terminal session Terminal monitor is off by default Terminal sessions are connections from VTY or asynchronous lines […]

CCNA 7.6.a: Ping and traceroute with extended option

Overview: Extended ping and extended traceroute commands are used to perform more advanced checks of host reachability and network connectivity   Study Notes:   Standard Ping The ping command is used to test and troubleshoot the accessibility of devices The ping command first sends an echo request packet to an address, and then it waits […]

CCNA 7.5.c: File system management

Overview: A basic set of commands can be used to manipulate files on your routing device using the Cisco IOS File System (IFS)   Study Notes: copy To copy files between directories (flash, slot0) or external servers (TFTP, FTP) Router#copy run start Router#copy flash: tftp:   delete To delete a file from a Flash memory […]

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