Free YouTube Playlists from Keith:
Master Playlist for Cisco CCNA 200-301 [ Ссылка ]
Cisco CCNA 200-301 Security [ Ссылка ]
Cisco CCNA 200-301 IPv4 Subnetting [ Ссылка ]
And…
Keith’s Content at CBT Nuggets [ Ссылка ]
Port Security | CCNA 200-301
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