350-401 · Question #721
Which statement about the EIGRP SRTT is true?
The correct answer is A. It is the average time that it takes for a reliable packet to be acknowledged.. EIGRP's Smooth Round Trip Time (SRTT) is a crucial metric that quantifies the average time it takes for a reliable EIGRP packet to be sent and subsequently acknowledged by a neighboring router.
Question
Options
- AIt is the average time that it takes for a reliable packet to be acknowledged.
- BIt is six time the RTO.
- CIt is the time that it takes for an update to be received by a peer.
- DIt is the time it takes to receive a reply to a query.
How the community answered
(69 responses)- A88% (61)
- B3% (2)
- C1% (1)
- D7% (5)
Why each option
EIGRP's Smooth Round Trip Time (SRTT) is a crucial metric that quantifies the average time it takes for a reliable EIGRP packet to be sent and subsequently acknowledged by a neighboring router.
The EIGRP SRTT (Smooth Round Trip Time) is the calculated average time from when a reliable EIGRP packet is sent to a neighbor until an acknowledgment is received from that specific neighbor, reflecting link latency.
The Retransmission Timeout (RTO) is calculated *from* the SRTT and variance, not the other way around, and it is not a fixed multiple of six times the SRTT.
While an update is a reliable packet, SRTT is a general average for all reliable packet acknowledgments, not specific to the reception time of an update by a peer.
Receiving a reply to a query is one type of reliable exchange, but the SRTT is an average measurement across all reliable packets and their acknowledgments, not exclusively for queries.
Concept tested: EIGRP reliable transport and SRTT calculation
Source: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/16406-eigrp-kvalues.html
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