Exam 300-101 Question id=437 Infrastructure Security

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)#ip udp helper-address 172.20.14.225
D. router(config-if)#ip helper-address 172.20.14.225 69 53 49
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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:
TFTPUDP 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

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