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DHCP: Dynamic Host Configuration Protocol

Dynamic Host Configuration Protocol (DHCP) is used to dynamically provide IP addresses and configuration information to client nodes. DHCP provides greater flexibility by leasing out IP addresses to host nodes. DHCP supports mechanisms that can be used by hosts to renew their lease.
This sequence diagram describes the DHCP interactions between a Laptop and the DHCP servers in the intranet. Four different cases are covered.
  1.    Laptop boots up for the first time and requests an IP address.
  2.    Laptop’s IP address lease is renewed.
  3.    Laptop reboots and confirms the IP address settings
  4.    Laptop is disconnected from Subnet 1 and reconnected in Subnet 3.

DHCP sequence diagram