lec14 - UCI University of California, Irvine Introduction...

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Introduction to Computer Networking Scott Jordan 1 UCI University of California, Irvine IP IP Class-based Addressing All IPv4 addresses have 4 bytes. The first 1, 2, or 3 bytes correspond to the "network", and the remaining bytes correspond to the "host number", with the location of the partition determined by the first 3 bits. (Walrand, fig. 3.9) By convention, IP addresses are written as "byte1.byte2.byte3.byte4". Class-based addressing is not very efficient in use of the address space, e.g. a network with 300 hosts uses up 1 class B address.
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Introduction to Computer Networking Scott Jordan 2 UCI University of California, Irvine IP IP Subnetting: Divide the "host number" portion of the address into "subnet ID" and "host ID", with the partition given by a "subnet mask". (Peterson, fig. 4.24) For instance, if the subnet uses 1 byte and the host uses 1 byte (as pictured), then the IP address is "network.subnet.host". Network number Host number Class B address Subnet mask (255.255.255.0) Subnetted address 111111111111111111111111 00000000 Network number Host ID Subnet ID
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Introduction to Computer Networking Scott Jordan 3 UCI University of California, Irvine IP IP Subnetting: (Kurose/Ross 4-37) ± IP address: 32-bit identifier for host, router interface ± interface: connection between host/router and physical link ² router’s typically have multiple interfaces ² host typically has one interface ² IP addresses associated with each interface 223.1.1.1 223.1.1.2 223.1.1.3 223.1.1.4 223.1.2.9 223.1.2.2 223.1.2.1 223.1.3.2 223.1.3.1 223.1.3.27 223.1.1.1 = 11011111 00000001 00000001 00000001 223 11 1
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Introduction to Computer Networking Scott Jordan 4 UCI University of California, Irvine IP IP Subnetting: (Kurose/Ross 4-38) ± IP address: ² subnet part (high order bits) ² host part (low order bits) ± What’s a subnet ?
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lec14 - UCI University of California, Irvine Introduction...

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