CSDN
Latest recorded position: #16 on Sep 17, 2026, 9:44 PM CST.
Across 2 retained daily records, the best recorded rank was #15. From the first retained rank (#23) to the last (#16), this listing rose 7 places.
Networking Fundamentals (Network Layer, Data Link Layer)
网络原理（网络层，数据链路层）
ThreadEast first recorded "Networking Fundamentals (Network Layer, Data Link Layer)" on Sep 16, 2026, 8:33 AM CST. It has been observed on CSDN, with 37 hours between the first and latest recorded appearances.
What the trend data tells us
The English title describes the topic of the source listing. Its appearance in a ranking measures attention within that platform; the ranking alone does not explain the cause of a spike or verify the underlying claim.
This stable URL remains available after a topic leaves a live ranking. Observation span is elapsed time between sightings, not continuous time on a chart. Platforms use different ranking and heat systems; their metrics are not added together.
Original evidence
Source listings
CS
#16Source metric: 6677
Original source Daily ranking timeline
Up to 180 recent daily records from retained observations and preserved archives. The best rank and last rank can differ within a day. Times use China Standard Time (UTC+8).
| Day | Platform | Best rank | Last rank | Observations |
|---|---|---|---|---|
| 2026-09-17 | CSDN | #15 | #16 | 2 |
| 2026-09-16 | CSDN | #19 | #19 | 2 |