9. Which of the following is the multiple access protocol for
channel access control?
a) CSMA/CD
b) CSMACA
c) Both CSMA/CD & CSMA/CA
d) HDLC
Answers
Explanation:
CSMA/CA stands for Carrier Sense Multiple Access / Collision Avoidance is a network protocol for carrier transmission. Like CSMA/CD it is also operated in the medium access control layer. Unlike CSMA/CD(that is effective after a collision) CSMA / CA is effective before a collision.
Let’s see the difference between CSMA/CA and CSMA/CD:-
S.NO CSMA/CD CSMA/CA
1. CSMA / CD is effective after a collision. Whereas CSMA / CA is effective before a collision.
2. CSMA / CD is used in wired networks. Whereas CSMA / CA is commonly used in wireless networks.
3. It only reduces the recovery time. Whereas CSMA/ CA minimizes the possibility of collision.
4. CSMA / CD resends the data frame whenever a conflict occurs. Whereas CSMA / CA will first transmit the intent to send for data transmission.
5. CSMA / CD is used in 802.3 standard. While CSMA / CA is used in 802.11 standard.
6. It is more efficient than simple CSMA(Carrier Sense Multiple Access). While it is similar to simple CSMA(Carrier Sense Multiple
Answer:
Multiple access protocol for Both CSMA/CD & CSMA/CA
Explanation:
In CSMA/CD ,it deals with detection of collision after collision occurred.
CSMA/CA deals with preventing collision .
CSMA/CD is abbreviation for carrier sensing multiple access /collision detection .CSMA/CA stands for carrier sensing multiple access /collision avoidance.
HDLC (High -level-Data- link) is a group of protocols or rules for transmitting data between network points .It is not used in it.
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