To traverse the tree of public data (i.e. "public" community), starting from the "iso" root:
snmpwalk -v 2c -Cc -c public -m ALL 10.0.0.1 iso
To print out private data ("private" community, enterprises leaf(1.3.6.1.4)):
snmpwalk -v 2c -c private -l authPriv -u "user" -a MD5 -A "pass" -x DES -X "pass" -m ALL 10.0.0.1 1.3.6.1.4