Exam N10-008 topic 1 question 87 discussion

Answer is CSMA/CA

CSMA/CA

O CSMA/CA é na verdade um protocolo de rede que evita colisões de pacotes em sistemas sem fio. Ele é usado em redes Ethernet e 802.11 (Wi-Fi), portanto, a resposta correcta para essa questão é a linha C. CSMA/CA is actually a network protocol that prevents packet collisions in wireless systems. It is used on Ethernet and 802.11 (Wi-Fi) networks, so the correct answer to this question is the C line.

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is the protocol used in the IEEE 802.11 standard for wireless networks. It allows multiple devices to share the same wireless medium by listening before transmitting to avoid collisions. Here's why the other options are incorrect: CDMA (Code Division Multiple Access): While used in some cellular networks, it's not part of the 802.11 standard for Wi-Fi. CSMA/CD (Carrier Sense Multiple Access with Collision Detection): Used in Ethernet networks, but not suitable for wireless due to the hidden node problem (where a node cannot detect collisions from other nodes). GSM (Global System for Mobile communications): A standard for mobile cellular networks, not Wi-Fi.

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.

CSMA/CA CDMA is not an 802.11 Wireless Standard. is there a way to report the circled answer wrong?

Answer is CSMA/CA

Answer is CSMA/CA

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).

CA since it is wireless

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

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?

CSMA/CA

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)