Multicast 30 Interview Questions


  1. What is Multicast?
  2. What is need to have multicast?
  3. Where are multicast addresses available?
  4. What are the protocols used in Multicast?
  5. What is IGMP? Which reserved IP address is used by Internet Group Management Protocol (IGMP) to discover and/or provide keep-alive services to multicast participants?
  6. What is the difference between IGMPv1, v2 and v3?
  7. What is the use of Multicast Distribution Tree?
  8. What is the Source Tree?
  9. What is the Shared Tree?
  10. What is PIM?
  11. What are 3 modes in which PIM can operate?
  12. What is Source Specific Multicast?
  13. What is Bidirectional PIM (bidir-PIM)?
  14. Where the Rendezvous Point (RP) should be placed? Which mode of PIM is RP related to?
  15. What is Anycast RP?
  16. What is Reverse Path forwarding?
  17. Can IP Multicast be load-balanced?
  18. What is the standard Ethernet multicast MAC address prefix
  19. Which multicast protocol is specifically/only used by routers and switches?
  20. At which layer(s) of the OSI model do multicast protocols operate
  21. Which OSPF Link State Advertisement (LSA) type supports Multicast information?
  22. Which Multicast Address does OSPF, EIGRP and RIPv2 use?
  23. What is the difference between (*, G) and (S, G) entry?
  24. What is the difference between dense mode, sparse mode and sparse dense mode?
  25. What protocols do switches use to prevent broadcasting of multicast traffic?
  26. What are 2-3 key characteristics of multicast routing?
  27. What are the two prerequisites for enabling multicast-only fast reroute (MoFRR) in a network?
  28. Which multicast address is used for Cisco RP Announce and Cisco RP Discovery?
  29. What is MSDP and why it is required?
  30. What is IGMP and CGMP?


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