by Boson Software, LLC
Boson TCP/IP Cheat Subnetting Study Guideby Boson software , LLCAn octet is a binary number of 8 bits, with the lowest possible number being 00000000 and the highest possible number being 11111111, or 28. The binary number 11111111, or 28, converts to 255 in decimal format. Table Address Class SummaryClassNumber of SubnetsNumber of Hosts Per SubnetRange of Network IDs (First Octet)Class A 26 6,777,2 4 26Class B 6,38465,534 28 9 Class C2,097, 52254 92 223The First-Octed Rule: High-Order Bits Determine the Address ClassThe decimal number in the first octet, or the high-order bits, represents the network ID for the address, and that network ID remains the same for all hosts on that network segment. High-order bits, which are also called the most significant bits, are those in the left-most portion of the binary address. The remaining octets act as host IDs. Address classes are categorized based on the decimal number in the first octet, as seen in Table 1, the Address Class Summary 2ClassBinary StartBinary EndFirst OctetMost Significant BitsSpecial NoteClass A0000000101111111 26*0AssignableClass B1000000010111111 28 9 10AssignableClass C1100000011011111 92 223110AssignableClass D1110000011101111224 2391110MulticastClass E1111000011111111240 25511110InterNIC*Addresses beginning with 127 are used for loopback testingTable 3ClassTotal Number of Subnets Per ClassEquationSubnetsClass 27 2
Boson TCP/IP Cheat Sheet www.boson.com Subnetting Study Guide by Boson Software, LLC An octet is a binary number of 8 bits, with the lowest possible number being 00000000 and the highest possible
Download by Boson Software, LLC
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: