Network Essay

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IP Addressing and Subnetting for New Users Document ID: 13788 Introduction Prerequisites Requirements Components Used Additional Information Conventions Understanding IP Addresses Network Masks Understanding Subnetting Examples Sample Exercise 1 Sample Exercise 2 VLSM Example VLSM Example CIDR Appendix Sample Config Host/Subnet Quantities Table Related Information Introduction This document gives you basic information needed to configure your router for routing IP, such as how addresses are broken down and how subnetting works. You learn how to assign each interface on the router an IP address with a unique subnet. There are many examples to help tie everything together. Prerequisites Requirements There are no specific prerequisites for this document. Components Used This document is not restricted to specific software and hardware versions. Additional Information If definitions are helpful to you, use these vocabulary terms to get you started: • AddressThe unique number ID assigned to one host or interface in a network. • SubnetA portion of a network sharing a particular subnet address. • Subnet maskA 32−bit combination used to describe which portion of an address refers to the subnet and which part refers to the host. • InterfaceA network connection. If you have already received your legitimate address(es) from the Internet Network Information Center (InterNIC), you are ready to begin. If you do not plan to connect to the Internet, Cisco strongly suggests that you use reserved addresses from RFC 1918 . Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. Understanding IP Addresses An IP address is an address used to uniquely identify a device on an IP network. The address is made up of 32 binary bits which can be divisible into a network portion and host portion with the help of a subnet

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