My Notes from chapter 10 of the CWNA study guide Wireless LAN client devices 802.11 Radio form factors 802.11 radios are used in both client NICs and access points. External Radios Many form factors, meaning the NIC comes in different shapes and sizes: PCMCIA adapter/PC card Express Card USB Internal Radios Installed inside the device …
Category: CWNE
CWNA Chapter 9 – 802.11 MAC Architecture
My Notes from chapter 9 of the CWNA study guide Packets, frames, and bits Same as OSI Model data traverses through each layer to be transmitted to the receiver and then back up the layers Data-Link layer Layer 2 of the OSI Model Divided into two sublayers: MAC Service Data Unit (MSDU) When the Network …
CWNA Chapter 8 – 802.11 Medium Access
My Notes from chapter 8 of the CWNA study guide Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) vs. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Set of rules to provide controlled and efficient access to the network medium. CSMA/CD is well known and is used by Ethernet networks CSMA/CA is not as well …
CWNA Chapter 7 – Wireless LAN Topologies
My Notes from chapter 7 of the CWNA study guide Wireless networking topologies Wireless wide area network (WWAN) Provides RF coverage over a vast geographical area Typically use cellular telephone technologies or proprietary licensed wireless bridging technologies Some examples of these cellular technologies are general packet radio service (GPRS), code division multiple access (CDMA), time …
CWNA Chapter 6 – Wireless Networks and Spread Spectrum Technologies
My Notes from chapter 6 of the CWNA study guide Industrial, Scientific, and Medical bands (ISM) ISM bands are defined by the ITU Telecommunication Standardization Sector (ITU-T) All three of these bands are license-free bands, and there are no restrictions on what types of equipment can be used in any of them. The frequency ranges …
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CWNA Chapter 5 – IEEE 802.11 Standards
My Notes from chapter 5 of the CWNA study guide Original IEEE 802.11 standard The first WLAN standard published. Defined by IEEE at the Physical and MAC layers of the OSI model. The PHY task group worked in conjunction with the MAC task group to define the original 802.11 standard. The PHY task group defined …
CWNA Chapter 4 – Radio Frequency Signal and Antenna Concepts
My Notes from chapter 4 of the CWNA study guide Azimuth and Elevation Charts (Antenna Radiation Envelopes) In either chart, the antenna is placed at the centre of the chart. Azimuth chart = H-plane = top-down view Elevation chart = E-plane = side view Interpreting Polar Charts Represent the decibel (dB) mapping of the antenna …
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CWNA Chapter 3 – Radio Frequency Components, Measurements, and Mathematics
My Notes from chapter 3 of the CWNA study guide RF Components Transmitters Initial component in the creation of wireless medium. Transmitters job is to begin the RF communications Transmitter starts AC signal oscillating at the RF frequency Transmitter takes data provided and modifies the AC signal using a Modulation technique Antenna Two functions when …
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CWNA Chapter 2 – Radio Frequency Fundamentals
My Study notes from Chapter 2 of CWNA Study Guide RF Characteristics Wavelength A wavelength is the distance between the two successive crescents (peaks) or two successive throughs (valleys) Frequency Is how often an RF signal cycles in a certain time period Standard measurement of frequency is hertz (Hz). An event that occurs once in …
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CWNA Chapter 1 – Wireless Standards, Organizations and Fundamentals
My Notes from chapter 1 of the CWNA study guide Standard Organisations Federal Communication Commission (FCC) Regulatory body for the United States for Radio, TV, wire, satellite and cable. Set Rules for what users can do with wireless around: Frequency Bandwidth Maximum power of the intentional radiator (IR) Max equivalent isotropically radiated power (EIRP) Use …
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