Which two EIGRP packet types are considered to be unreliable packets? (Choose two.)
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A. B. C. D. E.DE.
In EIGRP (Enhanced Interior Gateway Routing Protocol), there are five different packet types: hello, update, acknowledgement, query, and reply.
Of these five packet types, the two considered to be unreliable are the EIGRP query and reply packets.
A query packet is sent by a router when it needs information about a destination network from its neighbors. The query packet is considered to be unreliable because it is sent to all neighbors, and it is possible that some of these neighbors may not respond. If a neighbor does not respond to a query, the router that sent the query packet will have to send another query or take some other action to obtain the necessary information.
Similarly, a reply packet is sent by a router in response to a query packet. The reply packet is also considered to be unreliable because it is sent to the original sender of the query packet, and it is possible that the reply packet may be lost or delayed in transit. If the sender does not receive a reply packet, it will have to take some other action to obtain the necessary information.
On the other hand, the hello packet is used for neighbor discovery and is considered to be reliable. The update packet is used to send routing information and is also considered to be reliable because it is sent only to those neighbors that need the information. The acknowledgement packet is sent by the receiver of a reliable packet (hello or update) to confirm that it has been received.
In summary, the two EIGRP packet types that are considered to be unreliable are the query and reply packets.