What is an advantage of configuring a Cisco router as a relay agent?

Question:
What is an advantage of configuring a Cisco router as a relay agent?

• It can provide relay services for multiple UDP services.
• It reduces the response time from a DHCP server.
• It can forward both broadcast and multicast messages on behalf of clients.
• It will allow DHCPDISCOVER messages to pass without alteration.

Explanation: By default, the ip helper-address command forwards the following eight UDP services:
Port 37: Time
Port 49: TACACS
Port 53: DNS
Port 67: DHCP/BOOTP client
Port 68: DHCP/BOOTP server
Port 69: TFTP
Port 137: NetBIOS name service
Port 138: NetBIOS datagram service

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