The TCP/IP Guide - IP Subnetting Step #3: Determining The Custom Subnet Mask
Class B networks and Class B IP addresses
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Class B ID - Subnetting - YouTube
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CCNA Training » Subnetting Tutorial – Subnetting Made Easy
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How to Subnet a Class C Network: 7 Steps (with Pictures) - wikiHow
Private Class B Network Internet Protocol Addressing and Subnetting - Microsoft Community
Cisco CCNA Advanced TCPIP and Subnetting Part I
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IP Address Classes - FlackBox
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