11. 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.

A. 1 and 3
B. 2 and 4
C. 1,3 and 4
D. 2 and 5

Correct Answer: D. 2 and 5

12. Which of the following types of connections can use full duplex?

1. Hub to hub
2. Switch to switch
3. Host to host
4. Switch to hub
5. Switch to host

A. 1, 2 and 4
B. 3 and 4
C. 3 and 5
D. 2, 3 and 5

Correct Answer: D. 2, 3 and 5

13. Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?

A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 7

Correct Answer: C. Layer 4

14. Which fields are contained within an IEEE Ethernet frame header?

1. Source and destination MAC address
2. Source and destination network address
3. Source and destination MAC address and source and destination network address
4. FCS field

A. 1 and 4
B. 2 only
C. 2 and 3 only
D. 3 only

Correct Answer: A. 1 and 4

15. What type of RJ45 UTP cable do you use to connect a PC’s COM port to a router or switch console port?

A. Straight-through
B. Crossover cable
C. Crossover with a CSU/DSU
D. Rolled

Correct Answer: D. Rolled

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