Generic Routing Encapsulation (GRE) (obj 1.4) Flashcards
(17 cards)
What is Multicast Routing?
Sending traffic to a class D IP address (multicast group) to deliver messages to multiple recipients efficiently.
What is the objective of Multicast Routing?
Send traffic out once and have all interested devices receive it, while others ignore it.
What does IGMP stand for?
Internet Group Management Protocol
What is the role of IGMP in multicast routing?
Used by clients and routers to let the routers know which interfaces have multicast receivers.
What functionality does IGMP provide to clients?
Allows clients to join multicast groups and receive messages.
What is IGMPv1 known for?
Caused unnecessary traffic due to periodic group queries.
How does IGMPv2 improve upon IGMPv1?
Allowed clients to send leave messages.
What enhancement does IGMPv3 provide?
Added support for source-specific multicast.
What does PIM stand for?
Protocol Independent Multicast
What is the purpose of PIM?
Enables multicast traffic routing between multicast-enabled routers.
What do multicast distribution trees do?
Form the structure for multicast traffic routing.
What is PIM Dense Mode (PIM-DM)?
Uses flood and prune behavior, causing network performance issues.
What is the flooding behavior of PIM-DM?
Floods traffic initially, then prunes non-optimal routes.
Is PIM Dense Mode commonly used in modern networks?
No, it is not commonly used due to high network performance impact.
What is PIM Sparse Mode (PIM-SM)?
Uses shared distribution tree initially, then switches to optimal tree (Shortest Path Tree/SPT).
What is the impact of PIM-SM on network performance?
Lower impact on network performance.
Why is PIM-SM preferred in modern networks?
For efficiency.
