Chapter 6 Notes - Chapter 6 Addressing the Network IPv4 The...

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Chapter 6 Addressing the Network – IPv4 The Anatomy of an IPv4 Address IPv4 Addresses At network layer, packets of the comm. Need to be identified with source & dest. Addresses of the 2 end systems IPv4 addresses represented using dotted decimal system Each octet separated by a dot Network – a group of hosts that have identical bit patterns in the network address portion of their addresses Number of bits used in the host portion determines # of hosts we can have within the network Decimal to Binary Most Significant Bit – highest bit value in binary (leftmost bit) Addressing for Different Purposes Types of Addresses in an IPv4 Network Network address – the address by which we refer to the network The lowest address is reserved for the network address Broadcast address – a special address used to send data to all hosts in the network Uses highest address in the network range Used to send packets to every host in the network that shares the same network portion of the address Host address – the addresses assigned to the end devices in the network Each host has a unique address Network Prefixes The number of bits in the address that gives us the network portion Types of Communication Unicast – the process of sending a packet from one host to an individual host client/server and peer-to-peer Broadcast – sending a packet from one host to all hosts on the network Generally restricted to local network Host receives as it would a unicast packet Used for location of special services/devices for which the address is not known Host requests = queries Local network restriction based on config. of router 2 Types of broadcast Directed broadcast Sent to all hosts on a specific network Limited Broadcast Used for communication that is limited to the hosts on the local network Multicast – sending a packet from one host to a selected group of hosts Local network or routed through internetwork
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Conserve bandwidth One packet sent to multiple hosts Multicast Clients – hosts that wish to receive particular multicast data, subscribe to Multicast group When subscribed to, host processes packets addressed to this multicast address, as well as packets addressed to its uniquely allocated unicast address Multicast address range subdivided into different types of addresses Reserved link local addresses IP address in the range from 169.254.1.0 to 169.254.254.255 Used to auto. Assign an IP address to a device in an IP network when there is no other assignment method available (DHCP Server) Globally scoped addressees Unique addresses that are public domain addresses Administratively scoped addresses (limited scope addresses)
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This note was uploaded on 04/29/2008 for the course ICTN 2154 taught by Professor Khoury during the Spring '08 term at East Carolina University .

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Chapter 6 Notes - Chapter 6 Addressing the Network IPv4 The...

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