So, with a dynamic ip, your printer or other device will ask a DHCP server to assign it an address. This usually works fine. However, when the power goes out, it may take longer for the DHCP server to come online than the printer. I believe this is what your study material is referring to.
That being said, in real-world terms, this is a tiny consideration compared to reliability. Static IPs *may* also be more reliable, in some cases, simply because you don’t have to rely on a DHCP server to set its ip. *But* it can also lead to problems – for example, if the printer’s static ip falls in the same range as the address pool the DHCP server is assigning from, it may assign another device the same ip address when it fomes back online, before it sees the printer. So if you do assign static ips, you want to make sure they fall outside the pool that the DHCP server is assigning from.
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