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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
In Cisco IOS, interface reliability is measured on a scale out of 255, where 255/255 represents 100% perfect, error-free operational reliability. A drop down to 166/255 (roughly 65% reliability) indicates that the link is suffering from severe packet loss, frame errors, or extreme congestion bottlenecks.Looking closer at the transmission metrics explains why:The input rate at SiteA is 264,797,000 bits/sec (~265 Mbps).The output rate at SiteB matches this exact heavy stream (264,797,000 bits/sec).While the physical interface capacity is a 10Gbps link, a low reliability score alongside constant massive throughput bursts indicates that high traffic volumes and utilization on the path are overwhelming buffers, dropping packets, and driving up latency—causing the intermittent application drops.
A is the right answer, not D. Exhibit shows that this is single mode fiber and "media type is SFP-LR".
A: reliability 166/255