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If more than one DHCP server is available on the local network, in which order will DHCP messages be sent between a host and a DHCP server?

Question

If more than one DHCP server is available on the local network, in which order will DHCP messages be sent between a host and a DHCP server?

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Solution

When a host is configured to obtain an IP address automatically, it will go through the DHCP (Dynamic Host Configuration Protocol) process. This process involves four steps, often referred to as DORA (Discover, Offer, Request, Acknowledge). Here's the order of DHCP messages sent between a host and a DHCP server:

  1. Discover: The client (host) sends a DHCP Discover message to find available DHCP servers on the network. This message is a broadcast message, meaning it is sent to all devices on the network.

  2. Offer: All DHCP servers on the network receive the Discover message and respond with a DHCP Offer message. This message contains an available IP address and other network information for the client. If there are multiple DHCP servers on the network, the client may receive multiple Offer messages.

  3. Request: The client chooses one of the Offer messages it received and responds with a DHCP Request message. This message is sent to the chosen DHCP server to request the offered IP address and network information. If there are multiple DHCP servers, the client will ignore the offers from the other servers.

  4. Acknowledge: The chosen DHCP server receives the Request message and responds with a DHCP Acknowledge message. This message confirms that the IP address and network information have been assigned to the client. The other DHCP servers withdraw their offers.

So, if more than one DHCP server is available on the local network, the order of DHCP messages will be Discover, Offer, Request, and Acknowledge. The client will communicate with all available DHCP servers during the Discover and Offer steps, but will only communicate with one DHCP server during the Request and Acknowledge steps.

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