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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

Wireless Network Drawing

The Wireless Network solution helps users to quickly transition from an idea to the implementation of a wireless computer network. ConceptDraw DIAGRAM is well placed to provide experienced and comprehensive assistance in the workplace. The vector stencils, examples, and templates included to solution is a strong toolset for network engineer.

wireless communications, WLAN, wireless solution, wireless networking Wireless Networks

wireless communications, WLAN, wireless solution, wireless networking
The Wireless Networks Solution extends ConceptDraw DIAGRAM software with professional diagramming tools, set of wireless network diagram templates and samples, comprehensive library of wireless communications and WLAN objects to help network engineers and designers efficiently design and create Wireless network diagrams that illustrate wireless networks of any speed and complexity, and help to identify all required equipment for construction and updating wireless networks, and calculating their costs.

Personal area (PAN) networks. Computer and Network Examples

Personal area (PAN) networks
Personal area network (PAN) is a network organized on a limited area and used for data transmission between various personal devices, such as computers, tablets, laptops, telephones, different digital and mobile devices, etc. and also for connecting to higher level network and Internet. PAN is used to manage the interconnections of IT devices which surround a single user and generally contains such appliances, as cordless mice, keyboard, phone, and Bluetooth handsets. PANs can be wired with computer buses, or wirelessly connected to the Internet using such network technologies as Bluetooth, Z-Wave, ZigBee, IrDa, UWB, Body Area Network. PANs have a lot of pros and cons, they are expedient, lucrative and handy, but sometimes have bad connection with other networks on the same radio bands, Bluetooth has distance limits and slow data transfer speed, but is comparatively safe. ConceptDraw DIAGRAM diagramming software supplied with numerous solutions of Computer and Networks Area included to ConceptDraw Solution Park perfectly suits for designing the Personal Area Networks.

Wireless Networking for Mac

ConceptDraw DIAGRAM is a Wireless Network Drawing Mac OS software.

Wireless Networking

Wireless networking is useful visual tool for identification of all required equipment, and calculation the cost of creating or updating wireless computer networks. ConceptDraw DIAGRAM extended with Wireless Networks Solution from the Computer and Networks Area is the best wireless network diagramming software.

Network Gateway Router

Network Gateway Router
Special libraries of highly detailed, accurate shapes and computer graphics, servers, hubs, switches, printers, mainframes, face plates, routers etc.

ConceptDraw DIAGRAM Network Diagram Tool

Computer network diagrams visually depict the nodes of computer networks and connections between them. Diversity of Network Diagrams includes Wireless network diagrams, Network wiring diagrams, LAN network diagrams, Network WAN diagrams, Network topology diagrams, Network cable diagrams, Logical network diagrams, Network security diagrams, Diagram home network, Network physical diagrams, Activity network diagrams, and many others. To construct any of them it is useful to apply a special software with effective network diagramming tools. ConceptDraw DIAGRAM is ideal and powerful network diagram tool. It helps you diagram a network or create Computer network diagrams of various types using specialized and task-specific libraries of network components such as computers, hubs, switches, servers, routers, smart connectors, printers, mainframes, face plates, etc. that simulate network architectures, network design topologies and devices (all these shapes are parts of network diagram tool ConceptDraw DIAGRAM ).
Create Network Topology Diagram
Create Network Topology Diagram

Cisco Routers. Cisco icons, shapes, stencils and symbols

Cisco Routers
Network infrastructure planning is a very important process in the network construction, and the share of time allocated to this within the scope of the entire project may reach 60-80%. A competent and thorough approach to planning contributes to the quick investment return, and also increases the reliability and flexibility of the final system, reducing the probability of additional costs related to the incorrect implementation. Any planning begins with an analysis of the business requirements to the final system. Basic network parameters, which should be assessed are the scalability, accessibility, cost, speed and safety. Speed and cost are often mistaken for the most important parameters, and the rest of the parameters aren't even remembered. This is not entirely correct. Initially, it is necessary to assess the business plans for the future, because sometimes it is more profitable to invest more money in the beginning. If the business is to develop, then, consequently, demands on
"Network planning and design is an iterative process, encompassing topological design, network-synthesis, and network-realization, and is aimed at ensuring that a new telecommunications network or service meets the needs of the subscriber and operator. Network planning process involves three main steps: 1) Topological design: This stage involves determining where to place the components and how to connect them. 2) Network-synthesis: This stage involves determining the size of the components used, subject to performance criteria such as the Grade of Service (GoS). 3) Network realization: This stage involves determining how to meet capacity requirements, and ensure reliability within the network." [Network planning and design. Wikipedia]
This computer network system design diagram example was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Computer and Networks solution from the Computer and Networks area of ConceptDraw Solution Park.
Network system design
Network system design, workstation, wireless router, switch, smartphone, server, laptop computer, iPhone 4, hardware firewall, desktop PC, cloud, ADSL modem,
Used Solutions

Cisco Network Examples and Templates

The Cisco Network Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park provides a wide collection of predesigned templates and samples that help you to create the Cisco Network Diagrams in one moment.

3D Network Diagram Software

3D Network Diagram Software
3D diagrams give more visuality, they are more impressive, attractive, interesting, understandable, and look better than general 2D diagrams. ConceptDraw DIAGRAM supplied with Computer Network Diagrams solution from Computer and Networks area of ConceptDraw Solution Park is a powerful vector-based network diagramming software with useful and convenient tools for drawing 2D and 3D Network Diagrams by both professional engineers and designers, and beginners. Including a lot of predesigned 3D network elements and 3D icons of computer and network devices for customizing your Network diagrams, this solution lets to visually communicate computer networks architecture, topology and design, to simplify and accelerate understanding, analysis and representation, and easily design 3D computer communication network architecture, topology, logic and wiring diagrams, 3D LAN and WAN schematics, drawings and maps. Design easily the 3D diagrams of any types and styles, freely combine the 3D objects in any way you desire.

Network Hubs

Special libraries of highly detailed, accurate shapes and computer graphics, servers, hubs, switches, printers, mainframes, face plates, routers etc.

WLAN

ConceptDraw DIAGRAM diagramming and vector drawing software extended with Wireless Networks Solution gives the ability to its users to create professional looking WLAN schemes and diagrams quick and easy.

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.