ENT 219 Wireless LAN (WLAN)  Competencies


Demonstrate knowledge of:


1.      principles of wireless modulation/demodulation methods including: amplitude, frequency, phase, digital quadrature/binary phase (DQPSK, DBPSK), and gaussian (GPSK). Ohio IT section 49.2.3

2.      RF transmission, propagation, and WLAN antennae- including propagation speed and propagation delay. SNR. Ohio IT sections 21.4.4, 21.1.5, 21.1.9, 49.9.1, 49.9.2, 49.10.2

·        WLAN frequency bands (ISM). ISM channels.

·        diffused infrared light pulsing (PPM)

·        “Barker” and CCK bit coding

·        how wireless data rate is influenced by the transmission method: frequency hopping spread spectrum (FHSS), direct sequence spread spectrum (DSSS)

·        FHSS, DSSS, and diffused infrared bandwidth requirements.

·        how wireless data rate is affected by: station-to-station, station-access point (AP), and AP-bridge distances.

3.      OSI and TCP/IP models and associated layers with special emphasis on:

·        WLAN Physical sublayers (PMD and PLCP framing). FHSS, DSSS, and Diffused IR sublayer specifications.

·        WLAN MAC sublayer functions- access control, fragmentation, encryption, roaming

      Ohio IT sections: 21.5.1 – 21.5.6, 21.1.12, 21.6.13- 21.6.14, 20.7.1- 20.7.11, 49.10.5

4.      characteristics and uses of wireless network devices (AP, Bridge. Gateway, NIC). Compare and contrast with standard “wired” network devices. Ohio IT  sections 21.1.1, 21.2.1, 21.2.3, 21.2.4, 21.4.5.

5.      wireless standards (IEEE 802.11, IEEE 802.11b, and  “Bluetooth”). Ohio IT section 21.1.7

6.      WLAN access protocols including : CSMA/CA, virtual carrier sensing (RTS/CTS), net allocation vector (NAV),  home agent, AP service set identifier (SSID), station synchronization (PCF), AP and WGB association and re-association, roaming, channel polling and coordination (PCL), shared wireless access protocol (SWAP), authentication (ESSID), and privacy (WEP). Ohio IT sections 21.1.8, 21.2.2

 7.      mobile IP addressing and “care-of” addressing

 8.      WLAN implementations:

·        Basic Service Set (BSS)

·        Independent Basic Service Set (IBSS)

·        Extended Service Set (ESS)


Basic networking protocols- TCP/IP, ARP, RARP, SNMP, telnet, DNS. Ohio IT sections 21.5.5, 21.6.7-  21.6.11




1.      advantages/disadvantages of “wireless” versus “wired” networks (flexibility, ease of

      configuration/troubleshooting, cost, bandwidth, security issues, etc).

 2.      placement and distribution of access points and wireless bridges (“Link status”-Cisco Aironet 350/340) for BSS, IBSS,  and ESS WLANs.

3.      site survey (data rate, distance, quality of service) of wireless networks using Cisco Aironet 350/340 utilities (ACU)

4.      choice of propagation and transmission modes to be employed in a given WLAN.

5.      effects of EMI upon wireless communications (WLAN perspective).


Define and explain:


1.      WLAN cell area

2.      signal coding and decoding

3.      time-division duplex (TDD)

4.      “hidden node” WLAN problem

5.      “Barker” and CCK bit coding (DBPSK, DQPSK modulation)

6.      “Bluetooth” personal area networks (PAN) and hopping rate range

7.      wireless application protocol (WAP) and WML

8.      PCS circuit switching, and packet switching (CDPD)

9.      infrared PLCP “time slotting”




1.      Cisco Aironet 350/340 client utilities:

·        Channel frequency settings

·        Security settings including station access (ACL) and encryption (WEP)

·        Dynamic rate shifting

·        WLAN power management

·        WLAN monitoring to improve performance

 2.      ARP table entries on stations and the AP

3.      WIN98/2000 network settings (TCP/IP, folder/file sharing, drive mapping, access)


Install and configure:


1.        wireless NIC – WNIC (PCI, PC card varieties)

2.        access point device (AP)

3.        wireless workgroup bridge (WGB) device


Design, build, configure, and troubleshoot:


1.      IBSS WLAN

2.      BSS WLAN

3.      ESS WLAN

Ohio IT section 21.7.2


Oral and Written Presentation of a Complete WLAN Design Project


1.      Design planning and analysis to meet established objectives

2.      Design implementation, testing, and troubleshooting

3.      Documentation of design and configuration of hardware devices (WNIC, AP, WGB)