EIGRP uses five packet types:
1: Hello
2: Acknowledgment
3: Update
4: Query
5: Reply
Hello: EIGRP sends hello packets in the neighbor
discovery and recovery process.
Acknowledgment (ACK): An ACK packet
acknowledges the reception of an update, query, or reply packet. It is a hello packet with no data. ACKs
are unicast and use unreliable delivery.
Update: EIGRP uses update packets to propagate
routing information for destinations
Query: EIGRP sends query packets to find an
alternate route to a destination. Query packets can be
unicast or multicast.
Reply: EIGRP sends reply packets to respond to query
packets. Reply packets provide a feasible successor to
the sender of the query. They are always unicast to the
sender of the query packet.
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