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An administrator attempts to download the pack NBAR2 file using TFTP from the CPE router to another device over the Gi0/0 interface. The CPE is configured as below: hostname CPE ! ip access-list extended WAN <...> remark => All UDP rules below for WAN ID: S421T18E58F90 permit udp any eq domain any permit udp any any eq tftp deny udp any any ! interface GigabitEthernet0/0 <...> ip access-group WAN in <...> ! tftp-server flash:pp-adv-csr1000v-1612.1a-37-53.0.0.pack The transfer fails. Which action resolves the issue?
Correct Answer: C
The TFTP apparently is using the random port for the transfer: TFTP uses UDP as its transport protocol. A transfer request is always initiated targeting port 69, but the data transfer ports are chosen independently by the sender and receiver during the transfer initialization. The ports are chosen at random according to the parameters of the networking stack, typically from the range of ephemeral ports. https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol