What is IGMP snooping and why would I need it?

Related questions

1. What does IP source guard protect against?
2. What is IP DHCP snooping trust?
3. What is the aim of ARP spoofing attack?
4. How do I turn off DHCP snooping?
5. How does IGMP snooping work?
6. What is DHCP gleaning?
7. What is Option 82 in DHCP snooping?
8. What is snooping mode?
9. What is DHCP spoofing attack?
10. What is DNS poisoning attack?

Tags

1. #control
2. #snooping
3. #hosts
4. #multicasts
5. #links
6. #protocol
7. #conversation
8. #between
9. #routers
10. #process
11. #delivery
12. #which
13. #internet
14. #listening
15. #group
16. #multicast
17. #traffic
18. #network
19. #maintain
20. #listen
21. #management
22. #transmission
23. #switches