GSEC · Question #146
Which of the following is TRUE regarding Ethernet?
The correct answer is C. Ethernet is shared media. Ethernet is shared media, meaning all devices in a collision domain share the same physical medium and must use CSMA/CD to coordinate access and avoid collisions.
Question
Which of the following is TRUE regarding Ethernet?
Options
- AStations are not required to monitor their transmission to check for collisions.
- BSeveral stations are allowed to be transmitting at any given time within a single collision domain.
- CEthernet is shared media.
- DStations are not required to listen before they transmit.
How the community answered
(31 responses)- A10% (3)
- B3% (1)
- C81% (25)
- D6% (2)
Why each option
Ethernet is shared media, meaning all devices in a collision domain share the same physical medium and must use CSMA/CD to coordinate access and avoid collisions.
Ethernet's CSMA/CD protocol explicitly requires stations to monitor their own transmissions to detect collisions - the 'CD' (Collision Detection) component is a mandatory station behavior, not an optional one.
Within a single collision domain only one station can transmit successfully at any given time - simultaneous transmissions result in a collision, which CSMA/CD is specifically designed to detect and resolve via random back-off.
Ethernet is defined as shared media because all nodes on a segment share the same bandwidth and transmission medium. This shared characteristic is the reason CSMA/CD was designed - devices must sense the carrier and detect collisions because only one transmission can succeed at a time across the shared medium.
Ethernet mandates 'Carrier Sense' as the 'CS' portion of CSMA/CD, requiring every station to listen and confirm the medium is idle before beginning a transmission.
Concept tested: Ethernet CSMA/CD shared media access rules
Source: https://ieeexplore.ieee.org/document/9844436
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