Diego092: GLOSARIO CAP. CISCO 7

GLOSARIO

-Radio Frequency
Electromagnetic waves generated by AC and sent to an antenna within the elctromagnetic spectrum. RF waves can penetrate through walls and other obstacles, allowing a much greater range than IR.
-Infrared (IR)
Is relatively low energy and cannot penetrate through walls or other obstacles.
-Infrared Data Association (IrDA)
Defines protocol standards for the short range exchange of data infrared light for uses such as PANs.
-Industrial, scientific, and medical bands. (ISM)
Radio bands defined by the ITU-R in 5.138 and 5.150 of the Radio Regulations and shared with license-free, error tolerant communications applications such as wireless LANs and Bluetooth.
-Bluetooth
Wireless industry standard that uses an unlicensed radio frequency for short-range communication enabling portable devices to communicate over short distances. t is limited to low-speed, short-range communications, but has the advantage of communicating with many devices at the same time.
-Wireless Local Area Network (WLAN)
Two or more computers or devices equiped to use spread-spectrum technology based on radio waves for communication within a limited area.
-Encryption
The application of a specific algorithm to data so as to alter the apperance of data making it incomprehensible to those who are not autorized to see the information.
-Authentication
A process implemented on a network to verify the identity of a user.
-STA
Station
-WPAN
Wireless Local Area Network
-WLAN
Wireless Local Area Network
-WWAN
Wireless Wide Area Network
-AP
Access Point
-SSID
Service Set Identifier
-IBSS
Independent Basic Service Set
-BSS
Basic Service Set
-ESS
Extended Service Set
-CSMA/CA
Carrier Sense Multiple Access with Collisions Avoidance
-RTS
Request to Send
-CTS
Clear to Send
-ACK
Acknowledgement
-MAC filtering
Access control method that permits and denies network access based on MAC addresses to specific devices throught the use of blacklists and whitelists.
-Open Authentication
A type of wireless authentication where any and all clients are able to associate rengardless of who they are.
-PSK
Pre-shared Key.
-EAP
Extensible Authentication Protocol.
-RADIUS
Remote authentication dial in user service.
-AAA
Authentication, authorization and accounting.
-WEP
Wired Equivalency Protocol.
-WPA
Wi-Fi protected Access.
-Firmware
Software embedded in a hardware device typically provided on flash ROMs or as a binary image fille that can be uploaded onto existing hardware by a user.
-TCO
Total Cost of Ownership.
-Site Survery
The process of evaluating a network solution to deliver the required coverage, data rates, network capacity, roaming capability, and Quality of Service.

CARACTERÍSTICAS DE LOS DIFERENTES ESTÁNDARES
802.11
The IEEE 802.11 standard governs the WLAN environment. There are four amendments to the IEEE 802.11 standard that describe different characteristics for wireless communications.

-802.11a
Uses 5 GHz RF spectrum
Not compatible with 2.4 GHz spectrum, i.e. 802.11 b/g/n devices
Range is approximately 33% that of the 802.11 b/g
Relatively expensive to implement compared to other technologies
Increasingly difficult to find 802.11a compliant equipment
-802.11b
First of the 2.4 GHz technologies
Maximum data-rate of 11 Mbps
Range of approximately 46 m (150 ft) indoors/96 m (300 ft) outdoors
-802.11g
2.4 GHz technologies
Maximum data-rate increase to 54 Mbps
Same range as the 802.11b
Backwards compatible with 802.11b
-802.11n
Newest standard in development
2.4 GHz technologies (draft standard specifies support for 5 GHz)
Extends the range and data throughput
Backwards compatible with existing 802.11g and 802.11b equipment (draft standard specifies 802.11a support)

FUNCIONES DE LOS DISPOSITIVOS QUE COMPONEN UNA RED INALÁMBRICA
-Cliente
Any host devices that can participate in a wireless network. Most devices that can be connected to a traditional wired network can be connected to a WLAN if equipped with the proper wireless NIC and software. Can either be stationary or mobile. Commonly referred to as STA. Examples include: laptops, PDAs, printers, projectors and storage devices.
-STA
It is a wireless client.
-Antena
Used on APs and Wireless bridges
Increases the output signal strength from a wireless device
Receives wireless signals from other devices such as STAs
Increase in signal strength from an antenna is known as the gain
Higher gains usually translate into increased transmission distances
Antennas are classified according to the way they radiate the signal. Directional antennas concentrate the signal strength into one direction. Omni-directional antennas are designed to emit equally in all directions.

By concentrating all of the signal into one direction, directional antennas can achieve great transmission distances. Directional antennas are normally used in bridging applications while omni-directional antennas are found on APs.
-Punto de Acceso
Controls access between a wired and a wireless network. IE allows wireless clients to gain access to a wired network and vice versa. Acts as a media converter accepting the Ethernet frames from the weired network and converting them to 802.11 compliant frames before transmitting them on the WLAN.
-Bridge
It is a dispositive which conects two or more networks that use the same comunication protocol.

PRÁCTICAS
7.2.3.4