CCNP Enterprise Core (350-401)

The underlay network for software defined access should be configured to ensure performance, scalability, and high availability. Any problems that occur on the underlay network will affect the operation of the overlay network. It is possible to use a Layer 2 network underlay design running spanning tree protocol, but it is not recommended. The recommended…

The network layer in software defined access consists of the underlay network and the overlay network. The network underlay is the underlying physical layer, and transports the data packets between network devices for the software defined access fabric overlay. The overlay network is a virtual tunnelled network that virtually interconnects all of the network devices…

Everything in Cisco software defined access runs on physical network devices: Switches, routers, servers, wireless LAN controllers and wireless access points. Cisco switches provide wired access to the fabric. Support is available for both Catalyst and Nexus switches. Cisco routers provide WAN and branch access to the fabric. ASR, ISR, and CSR routers (including the…

The Cisco software defined architecture is based on existing hardware and software technologies. Software defined access integrates and manages these technologies together and divides them into four separate layers: The Mmanagement Layer, Controller Layer, Network Layer, and Physical Layer.

Software defined access is made up of two components, Cisco Campus fabric solution and Cisco DNA centre. The campus fabric is a Cisco validated fabric overlay solution that includes all features and protocols (control plane, data plane, management plane, and policy plane) to operate the network infrastructure. If the campus fabric solution is managed using…

SD Access provides an evolved campus network that can be built to address needs of existing campus networks with some additional features and capabilities, such as Network Automation Software defined access replaces a manual network device configuration with network device management through automation. It uses a single point of automation, orchestration and management of network…

SD-Access is an intent-based network design for enterprises. It is built on the Cisco Digital Network Architecture (DNA) and is combination of the campus fabric design and Digital Network Architecture Centre. SD-Access adds a fabric capability to a enterprise network through automation and can provide automated end to end segmentation to separate a user, device…

The simplified campus design relies on switch clustering such as the virtual switching system (VSS) and stacking technologies such as StackWise, where multiple switches are treated as a single logical switch. These technologies can be applied to any of the layers in the network design to simplify them. Simplifying the network through the use of…

Routed access is a configuration where Layer 3 is extended all the to access layer switches; one layer further than the distribution layer. The access layer switches act as Layer 3 gateways for the hosts that they are connected too, as well as providing Layer 2 switching. Access to distribution Layer 2 trunks are replaced…

A traditional local area network design uses a Layer 2 access layer with a Layer 3 distribution layer. The distribution Layer 3 provides the network gateway for the Layer 2 access layer hosts. Where possible, it is recommended to restrict a VLAN to a single access layer switch to eliminate topology loops which are a…