IPv4 Addressing

1
IPv4 Addressing
2
TCP/IP Protocol Stack
3
Flat vs. Hierarchical Addresses

• A flat address cannot be subdivided into parts
• Computer names in a NT domain
• Unless you create a naming scheme that imposes a
  structure (i.e. KCFIN01, KCFIN02, NYFIN01)
• A hierarchical address can be subdivided
• Postal addresses
• zip code, state city, street, number

4
IP Addresses

• 32 bit Addresses
• Dotted decimal 130.57.30.56
• Binary 10000010.00111001.00011110.00111000
• Hex 82 39 1E 38
• IP Addresses have two levels
• Network address
• Host address

5
Host Names

• Host names are an hierarchical naming scheme used
  for the benefits of humans
• HostName.SubdomainName.DomainName.TopLevelDomain
• This is a Fully Qualified Domain Name (FQDN)
• Host names must be resolved into IP addresses
  before IP can use them

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Host Names

• Top-level Domain Names (e.g. COM, EDU)
• Descriptive categories created by Internet
  authorities
• Domain name (e.g. UCF)
• Name chosen by an individual or organization
• Must be registered with the InterNIC
• Subdomains (e.g. BUS)
• Further descriptive categories created by
  organizations
• May have multiple subdomains
• Host Name (e.g. WWW, SYSTEMS)
• The name given to an individual host

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Network Classes
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Reserved Addresses

• Network all 0s
• This host
• e.g. 0.0.25.1
• Network all 1s
• All networks
• e.g. 255.255.25.1
• Entire address 1s
• All hosts on this network
• e.g. 255.255.255.255
• Network 127
• Loopback

• Host all 0s
• Identifies a network
• e.g. 129.130.0.0
• Host all 1s
• All hosts on indicated network
• e.g. 129.130.255.255