I read first edition of this book when it came. There were hardly any books available on SNMP at that time . Rose being one of the creators of SNMP, I expected this book to be good. And I was totally wrong! The descriptions are all fuzzy. After reading it, I had some idea about SNMP but I was not sure of anything I learnt. I think the RFCs on SNMP are best reading. They are precise and they do not leave you feeling uncertain.