A network engineer is configuring a routed interface to forward broadcasts of UDP 69, 53, and 49 to 172.20.14.225. Which command should be applied to the configuration to allow this?
A.
router(config-if)#ip helper-address 172.20.14.225
B.
router(config-if)#udp helper-address 172.20.14.225
C.
router(config-if)#ipudp helper-address 172.20.14.225
Suggested Answer:D. router(config-if)#ip helper-address 172.20.14.225 69 53 49🗳️
To let a router forward broadcast packet the command ip helper-address can be used. The broadcasts will be forwarded to the unicast address which is specified with the ip helper command. ip helper-address {ip address} When configuring the ip helper-address command, the following broadcast packets will be forwarded by the router by default: TFTP - UDP port 69 Domain Name System (DNS) UDP port 53 Time service - port 37 NetBIOS Name Server - port 137 NetBIOS Datagram Server - port 138 Bootstrap Protocol (BOOTP) - port 67 TACACS UDP port 49 Reference: http://www.cisco-faq.com/163/forward_udp_broadcas.html Topic 6, Infrastructure Services
A. router(config-if)#ip helper-address 172.20.14.225
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Nemanja
5 years, 4 months ago