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"There are two definitions for wireless LAN roaming:
Internal Roaming (1): The Mobile Station (MS) moves from one access point (AP) to another AP within a home network because the signal strength is too weak. An authentication server (RADIUS) performs the re-authentication of MS via 802.1x (e.g. with PEAP). The billing of QoS is in the home network. A Mobile Station roaming from one access point to another often interrupts the flow of data among the Mobile Station and an application connected to the network. The Mobile Station, for instance, periodically monitors the presence of alternative access points (ones that will provide a better connection). At some point, based on proprietary mechanisms, the Mobile Station decides to re-associate with an access point having a stronger wireless signal. The Mobile Station, however, may lose a connection with an access point before associating with another access point. In order to provide reliable connections with applications, the Mobile Station must generally include software that provides session persistence.
External Roaming (2): The MS (client) moves into a WLAN of another Wireless Internet Service Provider (WISP) and takes their services (Hotspot). The user can independently of his home network use another foreign network, if this is open for visitors. There must be special authentication and billing systems for mobile services in a foreign network." [Wireless LAN. Wikipedia]
This Cisco roaming wireless local area network diagram example was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Cisco Network Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.
WLAN diagram
WLAN diagram, wireless connectivity, smartphone, network cloud, multilayer switch, laptop, computer, notebook, laptop computer, iPhone 4, dual mode access point , access point,
Used Solutions

Cisco networking, Cisco network icons, Cisco icon Cisco Network Diagrams

Cisco networking, Cisco network icons, Cisco icon
Cisco Network Diagrams solution extends ConceptDraw DIAGRAM with the best characteristics of network diagramming software. Included samples, templates and libraries of built-in standardized vector Cisco network icons and Cisco symbols of computers, network devices, network appliances and other Cisco network equipment will help network engineers, network designers, network and system administrators, as well as other IT professionals and corporate IT departments to diagram efficiently the network infrastructure, to visualize computer networks topologies, to design Cisco computer networks, and to create professional-looking Cisco Computer network diagrams, Cisco network designs and schematics, Network maps, and Network topology diagrams in minutes.

Cisco Network Templates

Cisco Network Templates
Cisco is a huge multinational company that develops and sells worldwide the]network equipment, mainly for large organizations and telecommunication companies. So, it has large number of enterprise clients in a corporate environment. Therefore many network engineers often draw the Network diagrams for Cisco hardware and are needed in a powerful vector drawing software. ConceptDraw DIAGRAM is ideal for this goal, enhanced with professional Cisco Network Diagrams solution from Computer and Networks area of ConceptDraw Solution Park it offers a wide variety of vector design objects libraries, samples and also large set of Cisco network templates. The use of templates is the easiest and time-saving way of drawing professional-looking diagrams and schematics. Use them to design Cisco Network Topologies, Cisco Network Diagrams, Cisco ISG Topology Diagrams, Cisco Express Forwarding Diagrams, Rack Diagrams, Network Organization Charts, Wireless Computer Network Diagrams, Vehicular Network Diagrams, and many other types of diagrams without efforts.
This telecom diagram sample illustrates the call shop solution. It was designed on the base of the Wikimedia Commons file: Call shops.jpg.
[commons.wikimedia.org/ wiki/ File:Call_ shops.jpg]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"A call shop is a business providing on-site access to telephones for long-distance calling in countries without widespread home long-distance service. Calls may be prepaid or postpaid." [Call shop. Wikipedia]
The telecommunication diagram example "Call shop solution" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Computers and Communications solution from the Illustration area of ConceptDraw Solution Park.
Telecom diagram
Telecom diagram, monitor, keyboard, laptop, global communication, network, digital phone, data center, web hosting, cable connector,
Used Solutions