Data Link Layer Interview Questions
What fields are present in an Ethernet II frame?
What is the difference between a hub, a switch, and a router?
How does an Ethernet switch learn its MAC address table?
How does a switch handle known unicast, unknown unicast, broadcast, and multicast frames?
What is the difference between a collision domain and a broadcast domain?
Why are Layer 2 loops dangerous, and how does Spanning Tree help?
What changes and what stays the same when an IP packet crosses a router between Ethernet networks?
How does ARP work?
Which IP address does ARP resolve when the final destination is remote?
What is ARP spoofing, and why is ARP vulnerable to it?
What is a VLAN, and what is the difference between an access port and a trunk port?
What information does an IEEE 802.1Q VLAN tag contain?
Why do hosts in different VLANs need a router, even when connected to the same physical switch?
Is a VLAN the same as a subnet, and is a VLAN a security mechanism?
What is Ethernet?
What is Gratuitous ARP, and when is it used?
How do a bridge, a Layer 2 switch, and a Layer 3 switch differ?