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WLAN Elements

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What are the elements of a Wireless Local Area Network (wlan)? What are the typical tasks of access points, WLAN switches, WLAN routers, WLAN controllers, WLAN cables and other elements?
Who are the typical WLAN vendors?

Find the answers in the presentation 'Elements of Wireless Local Area Networks'

Published in: Technology
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WLAN Elements

  1. 1. Elements of Wireless Local Area Networks (WLAN) 1/15copyright © 2017 by schlager communications services GmbH Elements of Wireless Local Area Networks ronaldschlager.com © Ronald Schlager
  2. 2. Elements of Wireless Local Area Networks (WLAN) 2/15copyright © 2017 by schlager communications services GmbH Overview  WLAN Adapter  Access Point  Station Adapter  WLAN Switch / WLAN Controller  WLAN Router / WLAN Gateway  Security Server  WLAN Intrusion Detection Systems  Management Software  Cable, Connectors  Typical Vendors
  3. 3. Elements of Wireless Local Area Networks (WLAN) 3/15copyright © 2017 by schlager communications services GmbH WLAN Adapter  Typical tasks:  Attachment of mobile devices to WLAN  Implemented onboard, as network interface card, PC Card or USB adapter  Radio interface supports BluetoothTM or IEEE 802.11  Security functions (encryption, VPN)  For different computer bus systems and operating systems
  4. 4. Elements of Wireless Local Area Networks (WLAN) 4/15copyright © 2017 by schlager communications services GmbH WLAN Access Points  Typical tasks:  Internetworking of devices using radio interfaces for communication  Different versions for WISPs (WLAN Internet Service Providers) and end users  Standalone devices for different environments:  Office, factory, outdoor  Bitrates at radio interface:  According IEEE standard: up to 7+ Gbps
  5. 5. Elements of Wireless Local Area Networks (WLAN) 5/15copyright © 2017 by schlager communications services GmbH WLAN Switch / WLAN Controller  Typical tasks:  Internetworking of WLAN access points over LAN  Control and management of WLAN access points  Goals:  Increase of coverage  External power supply of access points WLAN Switch
  6. 6. Elements of Wireless Local Area Networks (WLAN) 6/15copyright © 2017 by schlager communications services GmbH WLAN Router / WLAN Gateway  Typical tasks:  Interconnection of WLANs and wired network (e.g. LAN, Internet)  Goal: use of resources of LANs (servers, printers, mass storage,...)  Converts WLAN interface into Ethernet interface, routes IP packets Corporate Network WLAN Router
  7. 7. Elements of Wireless Local Area Networks (WLAN) 7/15copyright © 2017 by schlager communications services GmbH WLAN Security Server  Typical tasks:  Used for authentication of users in a corporate network (wired, wireless)  Centralized user management incl. access rights  Diff. communication protocols for exchange of authentication data  RADIUS, TACACS Security Server Authentication using e.g. IEEE 802.1x Corporate Network
  8. 8. Elements of Wireless Local Area Networks (WLAN) 8/15copyright © 2017 by schlager communications services GmbH WLAN Intrusion Detection System (IDS)  Typical tasks:  Monitors networks or systems for malicious activities or security violations  Monitors WLAN systems, their configuration and activities  Control of security policy compliance  Detection of hacker / cracker attacks  Simulation of access points  Start of von counter-attacks  Reporting
  9. 9. Elements of Wireless Local Area Networks (WLAN) 9/15copyright © 2017 by schlager communications services GmbH WLAN Management Software  Typical tasks:  Centralized network monitoring  Support of network elements of different vendors  Integration or interworking with other management tools for wire-based LANs (e.g. BMC, HP, IBM,...)  Detection of rogue, „hacked “ or „obscure“ access points  Monitoring of network parameters  Detection of performance bottlenecks
  10. 10. Elements of Wireless Local Area Networks (WLAN) 10/15copyright © 2017 by schlager communications services GmbH Antennas  Typical characteristics:  Receive incoming radio signals  Radiate outgoing radio signals  For inhouse or outdoor use  Support specific frequency ranges  Omnidirectional, sectoral or directed  With or without gain  With horizontal, vertical or circular polarization  Fixed mounting, portable, for vehicles
  11. 11. Elements of Wireless Local Area Networks (WLAN) 11/15copyright © 2017 by schlager communications services GmbH Antennas  Typical designs:  Omnidirectional:  Radio signal is spread around the antenna across 360 degrees  For shorter ranges  Directional:  Radio signal is focused to a preferred direction  Extends the coverage of a WLAN  Yagi:  Directional antenna for large distances
  12. 12. Elements of Wireless Local Area Networks (WLAN) 12/15copyright © 2017 by schlager communications services GmbH WLAN Cable, Connectors  Cable types  All cables with impedance of 50 Ohm  Selection critera:  Short distance (< 3m): Thin cable (high attenuation)  Long distance (> 3m): Thick cable (low attenuation)  Important:  Installed cable should be produced all of one piece, don´t patch (different impedance causes attenuation, signal loss,...)
  13. 13. Elements of Wireless Local Area Networks (WLAN) 13/15copyright © 2017 by schlager communications services GmbH WLAN Cable, Connectors  Caution: many different connectors in use!  Type of connector depends on cable type (and diameter)  Different types available  SubMiniatur version A (SMA)  TNC  N-Type  BNC  MC  And more
  14. 14. Elements of Wireless Local Area Networks (WLAN) 14/15copyright © 2017 by schlager communications services GmbH Examples of Vendors Adtran (BlueSocket) Aerohive Allied Telesys Apple Avaya Belkin Brocade (Ruckus) Buffalo Technology Cisco / Linksys / Meraki D-Link Extreme Networks Fortinet (Meru Networks) HPE (Aruba Networks) Intel Juniper Networks LANCOM LevelOne Motorola Netgear Proxim Siemens SMC Teldat TRENDnet Zyxel
  15. 15. Elements of Wireless Local Area Networks (WLAN) 15/15copyright © 2017 by schlager communications services GmbH Resources Visit Ronald Schlager´s resources for more information: Follow the link to find more information at: „Fundamentals of Local Area Networks - Part 2 / 2“ Additional courseware: „Fundamentals of Local Area Networks - Part 1 / 2“ Book: „Abbreviations in Communications Technologies“ Book: „The OSI Model – simply explained“ Web: www.ronaldschlager.com Ronald Schlager´s Blog Ronald Schlager @ LinkedIn

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