Practice Your Wireshark-Fu with PCAP Challenges
Johannes Weber built a CCNP practice lab, configured 22 different protocols in it, and took packet captures of all of them happily chatting. To make things more interesting he created 45 challenges that you can solve with Wireshark using the pcap file he published.
For the low hanging fruit you can use basic protocol display filters to narrow down the amount of packets to answer the questions.
Your snmp one is --- n5rAD1ig314IqfioYBWw
Fun test as a refresher too.. Nice work...