ANET had made 135% from its previous low. Then you see this chart. What followed was from end of Nov 2025 (chart) until end of July 2026 ANET only improved 5% from the high depicted in the chart. It saw a drawdown of -30% during the Nov-Jul timeframe.
Strong uptrends usually do not end within a trading day. The structure deteriorates. You have plenty of them to recognize this and act and protect profits.

Stock is still in an uptrend
Price still above a long-term moving average
RS deteriorates or becomes unstable. The green is fading.
Shorter moving averages flattening or turning down. SMA histograms becoming choppy, red or flattening
Price repeatedly crossing the short-term averages
Moving-average alignment becoming compressed or disordered
Price progress slowing despite larger price swings increased volatility)
A previous smooth trend becoming jagged
Volatility expansion (increase) during up and down days
Volatility regime moves to high (yellow) or extreme (red)
High volume on both rallies and declines
Heavy selling volume after breakouts
High-volume reversals
Strong volume without lasting price progress