This also applies to Class A and Class B but raising 2 to unmasked bits of more than 8 is quite difficult to calculate mentally. Your broadcast address is 1 less than the next network address like. This will be your block size thus your 1st address will be. To identify the network address, find the decimal eqivalent of the octet. of hosts = (2^4)-2 = 14 because the network and broadcast address is not used. of subnets = 2^4 = 16 if ip subnet 0 is not allowed but you have to remove the first and last subnet giving you a total of 14 subnets. If you're given a /28, identify the masked bits (1) and unmasked bits (0). The MAC address for the selected network interface is displayed in the window.The Sybex CCNA reviewer is a good book. (Remember, every network interface has a different MAC address.) The window shown below appears.Ĭlick the Hardware tab. Here’s how to find your Mac’s MAC address for a network interface:įrom the Apple menu, select System Preferences.įrom the sidebar, select a network interface, such as Wi-Fi. For reasons like this, it can be a good idea to find and store your Mac’s MAC addresses. For example, if your computer is stolen on a university’s campus, the IT department may be able to use its MAC address to trigger an alert when the criminal connects your computer to a university network. MAC addresses can also be used for less nefarious purposes. Some universities and employers may request your Mac’s MAC addresses to monitor or limit your access to certain networks. AirPort Apple Apps Backups Developer Education Email Hardware Internet iPad iPhone Mac Music Network Photos Security TV Weekend WonkĮach of your Mac’s network interfaces - such as the ethernet and Wi-Fi cards - have a permanent, unique serial number called a media access control (MAC) address.
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