Câu 16: H12-224: HCNP-RS Fast Track (Huawei Certified Network Professional - Routing Switching Fast Track)

How does an IGMP router maintain group memberships on the network? (Choose two.)

1. A. The router maintains a timer for each group membership. If the router receives a Report message from a receiver host, it refreshes the timer of the group membership of this host; if the router does not receive any Report message from a receiver host before the timer expires, it deletes the group membership of this host. — đáp án hiện tại
2. B. The router periodically sends Query messages. After a receiver host receives the Query message, the receiver host sends a Report message. — đáp án hiện tại
3. C. A receiver host periodically sends a Report message.
4. D. The router deletes a group membership only when it receives a Leave message for this group.