看datasheet：The 10 Gigabit Ethernet copper port supports 10G, 1G, and 100-Mbps speeds. The SFP+ slot supports 10G and 1G speeds.

C1支持Flexible Netflow，LAN Base支持Netflow Lite。

买AIR-DNA，C9800的license是DNA

买C9K强制的DNA许可，3年的Essentials许可，详细功能见datasheet:https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html激活方法见配置手册:https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/sof...

路由器上都支持：https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/211333-IOS-PKI-Deployment-Guide-Initial-Design.html