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Classful addressing Easy to work out but very wasteful. Routers and hosts still assume class subnet masks by default. Class A /8 255.0.0.0. 23-Jul-12 18. Class B /16 255.255.0.0. Class C /24 255.255.255.0.Classless addressing Any suitable prefix can be used. We (and devices) need to know what the prefix is. More flexible, less wasteful. | Cisco SYSTE M s I Networking IIM I Addressing the network IPv4 CCNA Exploration Semester 1 Chapter 6 23-Jul-12 1 Cisco SYSTE M s I Networking IIM I IP addressing - works at OSI model layer 3 TCP IP model Internet layer Application z Presentation Data stream Session Transport Segment Network Packet Data link Frame Physical Bits HTTP FTP TFTP SMTP etc TCP UDP IP Ethernet WAN technologies App ion Transport Internet Network Access 23-Jul-12 2 Cisco SYSTE M s I Networking HI IS5ias Addressing topics Binary and decimal Types of IP addresses Assigning addresses Network part and subnet masks Calculating addresses Ping and Traceroute Utilities 23-Jul-12