Very good question. When PXE is enabled, during boot you'll see a black screen with some text about PXE connection. Sometimes a spinning ASCII character like a slash, then a dot, then another dot, then another like a timer. During this period, it's reaching out to the remote PXE server, and when communication is established, the PXE environment (pre-OS) is loaded on the machine you just booted. During the period when you see the dots acting like a timer, if there's no PXE connection, it times out and automatically defaults down to the next bootable device like a hard drive.
Very good question. When PXE is enabled, during boot you'll see a black screen with some text about PXE connection. Sometimes a spinning ASCII character like a slash, then a dot, then another dot, then another like a timer. During this period, it's reaching out to the remote PXE server, and when communication is established, the PXE environment (pre-OS) is loaded on the machine you just booted. During the period when you see the dots acting like a timer, if there's no PXE connection, it times out and automatically defaults down to the next bootable device like a hard drive.