255 is a commonly used number when it comes to maximums but doesn’t apply to IEEE 1394. Remember this doesn’t count the SCSI card. USB can handle up to 127 devices, though both of these numbers are outside the realm of normalcy for most individuals! 15 is the maximum amount of devices that can be on a SCSI chain. An IEEE 1394 (FireWire) chain can have up to 63 devices. Memory modules don’t use fans, but they can be equipped (or purchased) with heat sinks of their own. However, the two are often connected together. CPUs commonly use a heat sink/fan combination. This aids in keeping the CPU and other devices cool. They are used to exhaust heat out of the case. 80mm and especially 120mm are very common. Case fans are measured in mm (millimeters). All of the other addresses could possibly be obtained from a DHCP server. This address will be on the 169.254.0.0 network. If the computer fails to obtain an IP address from a DHCP server, Windows will take over and apply an Automatic Private IP Address (APIPA). CompTIA A+ 220-801 and 220-802 Practice Questions Exam Cram, 5th Edition
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