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COMPUTER NETWORKS CS610 Lecture-25 Hammad Khalid Khan
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Review Lecture 24 Addresses for Virtual Internet The IP addressing Scheme The IP Address Hierarchy Original Classes of IP Addresses
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Computing The Class Of An Address Whenever it handles a packet, IP software needs to separate the destination address into a prefix and suffix. Classful IP addresses are self-identifying because the class of an address can be computed from the address itself.
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Computing The Class Of An Address
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Dotted Decimal Notation Dotted decimal notation is a syntactic form, the IP software uses to express 32-bit binary values when interacting with humans. Dotted decimal represent each octet in decimal and uses a dot to separate octets.
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Dotted Decimal Notation
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Classes And Dotted Decimal Notation In class A the last three octets correspond to a host suffix. In Class B the last two octets are the host octets. Class C only has one octet to represent the host.
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Classes And Dotted Decimal Notation The range of decimal values found in the first octet of each address class.
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Division Of The Address Space The IP class scheme does not divide the 32-bit address space into equal size class and the classes do not contain the same number of networks.
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Division Of The Address Space A prefix of n bits allows unique network numbers, while a suffix of n bits allows host numbers to be assigned on a given network.
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Division Of The Address Space
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Authority For Addresses Throughout the internet, each network prefix is unique. Networks obtain their network numbers from their Internet Service Provider (ISP). The Internet service providers coordinate with The Internet Assigned Number Authority to obtain their network numbers.
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Classful Addressing Example Here we have a private TCP/IP network which consists of four physical networks. The first step is to assign IP addresses. – Usually assigned class C addressed. Network administrator computes the ultimate size of each physical network and assigns a prefix.
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Classful Addressing Example Class B Class A Class B Class C
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Summary Computing the Class of an IP Address Dotted Decimal Notation Classes & Dotted Decimal Notation Division of the Address Space Authority For Address A Classful Addressing Example
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