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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 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.

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.
"Physical topology refers to the placement of the network's various components, including device location and cable installation...
The shape of the cabling layout used to link devices is called the physical topology of the network. This refers to the layout of cabling, the locations of nodes, and the interconnections between the nodes and the cabling. The physical topology of a network is determined by the capabilities of the network access devices and media, the level of control or fault tolerance desired, and the cost associated with cabling or telecommunications circuits." [Network topology. Wikipedia]
This physical LAN 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.
LAN physical topology
LAN physical topology, server, modem, laptop computer, inkjet printer, iMac G5, iBook G4, hub, desktop PC,
Used Solutions
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
"At different scales diagrams may represent various levels of network granularity. At the LAN level, individual nodes may represent individual physical devices, such as hubs or file servers, while at the WAN level, individual nodes may represent entire cities. In addition, when the scope of a diagram crosses the common LAN/ MAN/ WAN boundaries, representative hypothetical devices may be depicted instead of showing all actually existing nodes. For example, if a network appliance is intended to be connected through the Internet to many end-user mobile devices, only a single such device may be depicted for the purposes of showing the general relationship between the appliance and any such device." [Computer network diagram. Wikipedia]
The physical LAN and WAN diagram template for the ConceptDraw PRO diagramming and vector drawing software is included in the Computer and Networks solution from the Computer and Networks area of ConceptDraw Solution Park.
Physical LAN and WAN diagram template
Physical LAN and WAN diagram template, workstation, router, modem, laptop computer, firewall, desktop PC, cloud,
Used Solutions
"A local area network (LAN) is a computer network that interconnects computers in a limited area such as a home, school, computer laboratory, or office building using network media. The defining characteristics of LANs, in contrast to wide area networks (WANs), include their smaller geographic area, and non-inclusion of leased telecommunication lines. Ethernet over twisted pair cabling, and Wi-Fi are the two most common technology standards currently used to build LANs." [Local area network. Wikipedia]
This local area network (LAN) topology diargam 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.
LAN topology diagram
LAN topology diagram, wireless router, switch, server, scanner, router, radio waves, laptop computer, inkjet printer, iPhone 4, desktop PC, cloud, IP phone,
Used Solutions

computer networks Computer and Networks Area

computer networks
The solutions from Computer and Networks Area of ConceptDraw Solution Park collect samples, templates and vector stencils libraries for drawing computer and network diagrams, schemes and technical drawings.

Active Directory, network topology, Active Directory Domain Active Directory Diagrams

Active Directory, network topology, Active Directory Domain
Active Directory Diagrams solution significantly extends the capabilities of ConceptDraw DIAGRAM software with special Active Directory samples, convenient template and libraries of Active Directory vector stencils, common icons of sites and services, icons of LDPA elements, which were developed to help you in planning and modelling network structures and network topologies, in designing excellently looking Active Directory diagrams, Active Directory Structure diagrams, and Active Directory Services diagram, which are perfect way to visualize detailed structures of Microsoft Windows networks, Active Directory Domain topology, Active Directory Site topology, Organizational Units (OU), and Exchange Server organization.

Active Directory Domain Services

Active Directory Diagrams visualize the detailed structures of the Microsoft Windows networks, Active Directory Domain topology, the Active Directory Site topology, the Organizational Units (OU), and the Exchange Server Organization.