Why is VLAN needed?

Related questions

1. What is VLAN hopping attack?
2. Can two VLANs have the same IP address?
3. What are VLAN tags?
4. What is VLAN ID range?
5. What is untagged VLAN?
6. What is tagged ports in VLAN?
7. What are QoS settings?
8. What is Preamble in Ethernet header?
9. Is voice VLAN tagged or untagged?
10. What is VLAN and VPN?

Tags

1. #users
2. #routers
3. #placing
4. #access
5. #network
6. #eliminate
7. #chances
8. #reduce
9. #periodically
10. #gaining
11. #expensive
12. #cases
13. #broadcast
14. #which
15. #those
16. #domains
17. #create
18. #outsider
19. #sensitive