GIAC
GSEC · Question #146
GSEC Question #146: Real Exam Question with Answer & Explanation
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.
Explanation
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.
Common mistakes.
- A. 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.
- B. 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.
- D. 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
Reference. https://ieeexplore.ieee.org/document/9844436
Community Discussion
No community discussion yet for this question.