Exam 300-425 topic 1 question 183 discussion

Leading PoE capabilities with up to 384 ports of PoE per stack, PoE+, and 288 ports high density IEEE 802.3bt-90W UPOE+, and 60W Cisco UPOE. https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html

Given the power limitations of each Catalyst 9300X-48HX switch, the correct answer is **D. half ports per switch**. Each switch can support a limited number of APs with full PoE functionality. By distributing the APs across both switches, the engineer ensures that each AP receives adequate power and network connectivity without exceeding the power limits of the switches.

C9300X-48HX’s default PSU can supply up to 590W while C9166 requires at least 25.5W to run on full functionality. It doesn't say the design includes dual PSU on the switch. see Table 4 https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html see Input power requirements https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9166-series-access-points/catalyst-9166-series-access-points-ds.html

The Cisco data sheet for the C9300X-48HX with a default build i.e. 1 x 1100W PSU (no 2nd PSU or an upgrade to the 1900W PSU) can provide a PoE budget of 590W. The 9166 APs require a minimum and with all radios on 802.3at (PoE+). This is with the USB port off/unpowered. This is 25.5W per AP. Or 802.3bt (UPOE) with the USB port now on (takes 4.5W). The AP running at full functionality requires 30.5W max. So this is either: Default PoE budget of 590W / 25.5W = 23 APs Or default PoE budget of 590W / 30.5W = 19 APs So the answer must be half ports per switch and that isn't really possible except the resting power draw may be a little less.

C9300X-48HX 48 port Cisco UPOE+, 48x 10G Multigigabit (10G/5G/2.5G/1G/100M) with 90W UPOE+ Modular Uplinks 1100W AC Catalyst 9166 802.3at (PoE+) 2.4GHz - 4x4 5GHz - 4x4 6GHz - 4x4 Speed - 5 Gbps USB - N 25.5 W