Which two circumstances can cause collision domain issues on VLAN domain? (Choose two)

Question:
Which two circumstances can cause collision domain issues on VLAN domain? (Choose two)

• duplex mismatches on Ethernet segments in the same VLAN
• multiple errors on switchport interfaces
• congestion on the switch inband path
• a failing NIC in an end device
• an overloaded shared segment

Explanation: On an Ethernet connection, a duplex mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex. Duplex mismatch can easily cause collision domain issue as the device that operates in full duplex mode turns off CSMA/CD. So it is eager to send data immediately without checking if the link is free to use -> A is correct.

An “inband path” is the path which provides path for management traffic (like CDP, VTP, PAgP…) but we are not sure why congestion on the switch inband path can cause collision domain issues. Maybe congestion on inband path prevents the JAM signal (sent when a collision occurs on the link) to be sent correctly on the link.

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