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What is the primary function of a DHCP relay agent?To assign IP addresses to clientsTo forward DHCP messages between clients and servers on different networksTo renew IP address leasesTo resolve hostnames to IP addresses

Question

What is the primary function of a DHCP relay agent?To assign IP addresses to clientsTo forward DHCP messages between clients and servers on different networksTo renew IP address leasesTo resolve hostnames to IP addresses

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Solution

The primary function of a DHCP relay agent is to forward DHCP messages between clients and servers on different networks.

Here's a step-by-step explanation:

  1. When a client device connects to a network, it sends a broadcast message (DHCPDISCOVER) in search of a DHCP server to obtain an IP address.

  2. If the DHCP server is not on the same network as the client, the broadcast message cannot reach it directly due to network boundaries.

  3. This is where the DHCP relay agent comes in. It resides on the same network as the client and listens for these broadcast messages.

  4. Upon receiving a DHCPDISCOVER message, the DHCP relay agent forwards it to the DHCP server, even if it's on a different network.

  5. The DHCP server then responds with a DHCPOFFER message, proposing an IP address for the client. This message is unicast to the DHCP relay agent.

  6. The DHCP relay agent then broadcasts this message on its local network for the client to receive and accept.

So, the DHCP relay agent acts as an intermediary, forwarding messages between the client and server, enabling them to communicate effectively even when they are on different networks.

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