What are the functions of the DHCP Request message

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The DHCP Request message provides the following functions:
--Responds to the Offer message sent by the server.
The DHCP Request message notifies the selected server during address application as it contains the server identifier option.
--Checks the assigned network address.
--Applies for the valid period of the address.
--Extends the existing lease and prolongs the lease period.

Other related questions:
Function of DHCP Request packets on S series switch
For S series switches, DHCP Request messages are sent in the following conditions: - Respond to the DHCP Offer message sent by DHCP servers. - Notify the selected DHCP server using the server identifier option. - Check the allocated network addresses. - Apply for the valid period of addresses. - Extend the existing lease and prolong the lease period.

Which versions of S series switch functioning as DHCP server can return requested options to clients
When an S series switches (except S1700 switches) functions as a DHCP server, it encapsulates an option field in the Reply message sent to a client only when: 1) The Request message sent by the client requests the option; 2) The option is configured in the address pool on the server.

Functions of the GIADDR field of DHCP messages on S series switches
Functions of the GIADDR field of DHCP messages on S series switches: he GIADDR field (gateway IP address) in DHCP messages records the IP address of the first DHCP relay agent that DHCP messages pass through. After a client sends a DHCP Request message, the first DHCP relay agent fills its own IP address in this field when forwarding this DHCP Request message to the DHCP server if the server and the client are located on different network segments. The DHCP server uses the field to determine the network segment on which a client resides so that the server can assign an IP address on this network segment to the client.

What are the functions of LDP Hello messages
An LSR maintains the adjacency relationship with another LSR through received Hello messages. The LSR maintains the Hello Hold timer of the Hello adjacency. Upon receiving a Hello message matching the Hello adjacency, the Hello Hold timer is reset. If the Hello Hold timer expires, the LSR deletes the Hello adjacency. If the LDP session has only one Hello adjacency, the LSR deletes the LDP session.

What are the functions of LDP KeepAlive messages
An LSR maintains the LDP session with another LSR based on the received KeepAlive messages. The LSR maintains the KeepAlive Hold timer of the LDP session. Upon receiving a KeepAlive message matching the LDP session, the KeepAlive Hold timer is reset. If the KeepAlive Hold timer expires, the LSR deletes the LDP session.

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