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Wireless Access Points (WAPs) or (APs)

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  1. Wireless Access Points(WAPs) or (APs)

  2. Wireless Access Point (WAP) • An access point (AP) is a WLAN device that can act as the center point of a stand-alone wireless network or be used as the connection point between wireless and wired networks • Central communication point for wireless network user. • Can link wired and wireless network together. • Act as a central transmitter and receiver of WLAN radio signal.

  3. Cisco Access Points (APs) • Cisco Access Points (APs) provide: • 1- Enterprise level security • 2- Monitoring • 3- Manageability

  4. Hardware devices of Access Point (AP) • Access Points work at data link layer (layer two of OSI model) • 1- Built-in network adapter. • 2- Antenna. • 3- Radio transmitter. • 4- Support Wi-Fi wireless communication standard . • Wi-Fi (Wireless – Fidelity) • The first standard that had the wireless communication standard (Wi-Fi) was IEEE 802.11b .

  5. Usages of Access Points (APs) • Wi-Fi ( Wireless Fidelity) WAP provide: • 1- Low cost • 2- Easily installed • -In small wireless network (WLAN) can work without the needing of Access Point if it is in the ad-hoc mode (Peer – to – peer). • -In the networks which connect a wireless network with a wired network , must use Access Point (AP) and it offers adding of large clients. • Old and base model of AP allow (10 to 20 ) clients . • New AP support up to 255 clients

  6. Usages of Access Points (APs) Access Point (AP) act as bridge Can connect two wired networks together without using wires. Access Point (AP) often used to connect wired network provided with internet services with numbers of wireless connected devices ,this network called (managed network) or (infrastructure network).

  7. Access Point (AP) Vs ad-hoc mode • The advantages of AP over the ad-hoc mode • 1- Increase the range • 2- Provide better security • The advantages of the ad-hoc modeover the AP • 1- The station can exchange data directly , there is no need for station to send data to AP. • 2- Increase the available bandwidth because of the direct data transfer.

  8. Limitations Wireless AP can communicate 30 clients located within 100 meter Actual range may vary depending on: 1- Indoor an outdoor placement. 2- Height above ground. 3- Nearby obstructions. 4- Other electronic devices broadcasting on the same frequency . 5- Type of antenna. 6- The current whether.

  9. Extending WLAN range with repeater • Repeater : device which regenerate a network signal in order to extend the range of existing network infrastructure . • A wireless repeater is simply an access point that is not connected to the wired backbone. • .

  10. models for Cisco APs: • Some Access Points (APs) have a built in repeater mode. • There are three basic models for Cisco APs: • 1- Cisco Aironet 1200 • 2- Cisco Aironet 1100 • 3- Cisco Aironet 350 • Cisco Aironet 350 and 1200 allow you to configure the access point as a repeater

  11. Roaming Roaming : is the extending of connectivity services in a location that is different from the home location where the service was registered. Users maintain a continuous connection as they roam from one physical area to another. Mobile nodes automatically register with the new access point.

  12. Access Point (AP) classifications : • 1- Fat APs • Have all necessary tools to manage the wireless network , it doesn’t need to have central access controller , it saves power( POE) Power over Ethernet. • 2- Thin APs • It considered as a switch which switch or convert the wired signal to a radio signal. • It provided by central access controller.

  13. Access Points configuration Five steps necessary when connecting the access point : 1- Plug the RJ45 Ethernet cable into the Ethernet port on the back of the access point. 2- Connect the other end of the Ethernet cable to Ethernet LAN. 3- Plug the power adapter into a suitable power. 4- Plug the power connector into the back the access point. 5- Don’t connect the Ethernet cable when the access point is powered up.

  14. LED indicators 1100 AP 1200 AP • The LED lights on an access point convey status information. • When the access point is powering on, all three LEDs normally blink. • After bootup, the colors of the LEDs represent the following: • Green LEDs indicate normal activity. • Amber LEDs indicate errors or warnings. • Red LEDs mean the unit is not operating correctly.

  15. Connecting to the Access Point (AP) Wired Wireless: Requires Association

  16. Connecting to the AP (Console) Serial Console Rollover Cable IOS CLI Accessing through console setting Connect the serial cable from the PC to the access point then open the hyper terminal.

  17. Connecting to the AP (Telnet) Cisco • Accessing through telnet • From DOS enter • Telnet (IP – address) • (Telnet , HTTP) work at application layer of OSI model • AP Defaults • IP Address = 10.0.0.1/24

  18. Connecting to the AP (Browser) Preferred Method! Wired Wireless: Requires Association Accessing through web browser By enter the IP address in the address line of the web browser