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A network administrator is installing a wireless network at a client's office. Which of the following IEEE 802.11 standards would be BEST to use for multiple simultaneous client access?
Since the question is about IEEE 802.11 standards for wireless networks, the closest relevant option is C. CSMA/CA, as it is a protocol used in IEEE 802.11 wireless networks to manage how devices share the airwaves. However, for the specific feature of handling multiple simultaneous client access, the latest IEEE 802.11 standards like 802.11ac (Wi-Fi 5) or 802.11ax (Wi-Fi 6), which include MU-MIMO capabilities, would be the best choice. These standards are designed to handle high-density environments and provide better performance for multiple devices connected at the same time.
Code Division Multiple Access (CDMA) encrypts data with a key & then transfers the encrypted data simultaneously with other data from other client sources, it was published in IEEE's Transactions on Vehicular Technology Volume 40: Issue: 2, May 1999. (https://ieeexplore.ieee.org/document/289410)
CSMA/CA is meant to avoid simultaneous transmissions of wireless devices by using a Clear Channel Assessment (CCA) encoded system. Without CCA, clients would conflict without the CDMA encoding technology.
CSMA/CD is a wired MAC technology that listens to a cable using a Request To Send (RTS) protocol & will send it's data if receiving the Clear To Send (CTS), if it doesn't receive CTS, it will use a back-off timer & then try again.
A wireless radio transmitting and receiving within a particular range of frequencies
with the same modulation scheme is a half-duplex shared access medium
(a physical bus). 802.11 uses Carrier Sense Multiple Access with Collision
Avoidance (CSMA/CA) to cope with contention.
A. CDMA (Code Division Multiple Access) is a cellular network technology, not related to IEEE 802.11 Wi-Fi.
B. CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is used in wired Ethernet networks, not in Wi-Fi networks.
D. GSM (Global System for
The correct answer is --->CSMA/CA
CSMA/CA is the protocol helps avoid collisions that can occur when multiple devices attempt to transmit data simultaneously. CSMA/CA listens for a clear channel before transmitting data and uses mechanisms to reduce the likelihood of collisions.
The correct answer for the given question is:
C. CSMA/CA
CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is the protocol used in IEEE 802.11 wireless networks to manage access to the network medium. It ensures that multiple devices can access the network simultaneously without colliding with each other.
CDMA (Code Division Multiple Access), CSMA/CD (Carrier Sense Multiple Access with Collision Detection), and GSM (Global System for Mobile Communications) are not IEEE 802.11 standards related to wireless local area networks (WLANs).
The devil inside this question is multiple simultaneous access , CDMA, CSMA/CA and CSMA/CD are all example of multiple access but CDMA not a 802.11 standard. CDMA uses several transmitters to send information simultaneously over a single communication channel. On the other hand remember CSMA/CA and CSMA/CD are only network protocol for transmission use in wireless and wired respectively to ensure multiple simultaneous (CSMA/CA).
The question is talking about wireless network, and only options are GSM/CDMA.
Hence CDMA is the best option for multiple simultaneous.
Answer A right
This is incorrect. Your explanation is incoherent and self contradicting. The question specifically asks about IEEE 802.11, which rules out cellular techniques of channel division.
The correct answer is C.
Based on the comments there seems to be overwhelming agreement that C is the correct answer. And the explanation seems logical. In cases like this does the community vote trump the default answer?
The discussion areas usually have trusted and verified input from people of all types, including experienced network engineers. I'd listen to them any day over the answers given.
CDMA (Code Division Multiple Access) and GSM (Global System for Mobile Communications) are cellular network standards and are not used in wireless local area networks (WLANs)
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