Computer Networking
How does a host on an Ethernet LAN know when to transmit after a collision has occurred?1. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.2. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.3. You can improve the CSMA/CD network by adding more hubs.4. After a collision, the station that detected the collision has first priority to resend the lost data.5. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

2 and 5
1 and 3
1,3 and 4
2 and 4

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Computer Networking
X.21 is

None of these
a method of determining which device has access to the transmission medium at any time
a method access control technique for multiple-access transmission media
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO

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