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Hub and spoke in regards to the CCNA, is probably describing a common Frame Relay/WAN network setup.
Say you had 6 seperate sites you had to connect. It would take 15 circuits to have full connectivity between them as a full mesh, and it gets worse with the more sites you have.
Hub and Spoke is taking 1 site, and connecting all sites to it, to trasit that site to get to each other. This way, 6 sites can have fully connectivity with only 5 circuits.
So say you have sites A,B,C,D,E and F, with site A as the hub and B,C,D,E,F as the spoke would connect to site A, and use site A to get to each other.
You can say partial mash network as a hub and spoke network.
in breif.
hup and spoke is a method of connecting where all the nodes connected to each other thru the hup in the center. its also known as "Star Network".
Hub is the Head Office
Spokes are the Remote Sites
above can be the easiest example I can give
The spoke-hub distribution paradigm (or model or network) is a system of connections arranged like a wire wheel, in which all traffic moves along spokes connected to the hub at the center. The model is commonly used in industry, in particular in transport, telecommunications and freight, as well as in distributed computing, where it is known as a star network.
