Wireless technologies LAN Switching and Wireless – Chapter 7 and Fundamentals of Wireless LANs course basics ITE I Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1 Objectives Describe the components and operations of basic wireless LAN topologies. Describe the components and operations of basic wireless LAN security. Configure and verify basic wireless LAN access. Configure and troubleshoot wireless client access. ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2 What is Wireless LAN? Wireless LAN (WLAN) - provides all the features and benefits of traditional LAN technologies such as Ethernet and Token Ring, but without the limitations of wires or cables. ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3 Other Wireless Technologies Cellular Bluetooth or PAN (Personal Area Network) 3G (3rd Generation) UWB (Ultra Wide Band) FSO (Free Space Optics) Radio waves off meteor trails! ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4 WLAN evolution Warehousing Healthcare Education Businesses Home Speed 860 Kbps Network Radio ITE 1 Chapter 6 Standards-based Proprietary 900 MHz 2.4 GHz 1986 1988 1990 © 2006 Cisco Systems, Inc. All rights reserved. 11 Mbps 54 Mbps 1 and 1 and 2 Mbps 2 Mbps IEEE 802.11Begins Drafting 1992 Cisco Public 1994 5 GHz 2.4 GHz 1996 802.11 Ratified 802.11a,b 802.11g Ratified Drafted 1998 2000 2002 5 Current standards – 802.11 a/b/g Speed 860 Kbps Radio 900 MHz 2.4 GHz 1986 Standards-based Proprietary Network 1988 11 Mbps 54 Mbps 1 and 1 and 2 Mbps 2 Mbps 1990 IEEE 802.11Begins Drafting 1992 1994 5 GHz 2.4 GHz 1996 802.11 Ratified 802.11a,b 802.11g Ratified Ratified 1998 2000 2003 802.11a Up to 54 Mbps 5 GHz Not compatible with either 802.11b or 802.11g 802.11b Up to 11 Mbps 2.4 GHz 802.11g Up to 54 Mbps ITE 1 Chapter 6 2.4© 2006 GHz Cisco Systems, Inc. All rights reserved. 802.11g is backwards compatible with 802.11b, but with a drawback (later) Cisco Public 6 Physical Layer radio modulations 802.11b (11MBit / 2.4GHz) FHSS – Frequency Hopping Spread Spectrum DSSS – Direct Sequence Spread Spectrum 802.11g (54MBit / 2.4 GHz) OFDM – Ortogonal Frequency Division Multiplexing 802.11a (54MBit / 5 GHz) OFDM – Ortogonal Frequency Division Multiplexing ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7 Explain the Components and Operations of Basic Wireless LAN Topologies Describe why wireless LANs are a popular choice for small business LAN implementations ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8 Explain the Components and Operations of Basic Wireless LAN Topologies Describe the components of a 802.11-based wireless infrastructure ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9 Wireless LANs components Describe the components of a 802.11-based wireless infrastructure In-building Infrastructure • 1200 Series (802.11a and 802.11b) • 1100 Series (802.11b) • 350 Series (802.11b) not shown ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10 Antennas Describe the components of a 802.11-based wireless infrastructure Antenna •2.4GHz Antennas •5 GHz Antennas ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11 Cables / Accessories Describe the components of a 802.11-based wireless infrastructure Cable and Accessories • Low Loss Cable • Antenna Mounts Antenna • Lightening Arrestor •2.4GHz Antennas •5 GHz Antennas ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12 Explain the Components and Operations of Basic Wireless LAN Topologies Basic Service Set Set (BSS) / Infrastructure Extended Independent Service Basic Service (ESS) Set (IBSS) / Ad-hoc ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13 ESS roaming feature Describe how to plan a wireless LAN A WLAN designer must determine whether clients will require seamless roaming from access point to access point. Not yet standardized by IEEE 802.11 IAPP (Inter-Access Point Protocol) ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14 Explain the Components and Operations of Basic Wireless LAN Security Describe the threats to wireless LAN security ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15 Explain the Components and Operations of Basic Wireless LAN Security Describe the wireless protocols. The description will include a description of 802.1x, a comparison of WPA and WPA2 as well as comparison of TKIP and AES ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16 Explain the Components and Operations of Basic Wireless LAN Security Describe how to secure a wireless LAN from the key security threats ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17 Configure and Verify Basic Wireless LAN Access Configure a wireless access point ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18 Configure and Verify Basic Wireless LAN Access Configure a wireless NIC ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19 Configure and Troubleshoot Wireless Client Access Describe how to solve access point firmware issues ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20 Configure and Troubleshoot Wireless Client Access Describe how to solve authentication problems associated with wireless LANs ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21 Summary Wireless LANs use standards such as IEEE 802.11a IEEE 802.11b IEEE 802.11g IEEE 802.11n Basic Service set –Mobile clients use a single access point for connectivity Extended service set –Multiple access point that share an SSID ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22 Summary WLAN security practices/methods include –MAC address filtering –SSID making –Implementing WPA2 Configuration of wireless NIC and access point –Configure both of them the same way •SSID –Ensure that the latest firmware is installed Troubleshooting WLANs include doing the following: –Check channel setting –Check for interference ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23 Záver prezentácie Ďakujem za pozornosť. Moderné vzdelávanie pre vedomostnú spoločnosť. Projekt je spolufinancovaný zo zdrojov EÚ. ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24