ISBN 0201615711 is perhaps a better link [isbn://0201615711] produces that using the PM shortcut, and you get a comparison of prices and shipping times that way.
I'd like to recommend a book not specific to Perl. Actually the code is in C. It's applicable to any language and is the most authoritative text I've ever encountered. It's Unix Network Programming originally by W. Richard Stevens and updated after his death by Bill Fenner and Andrew M. Rudoff. The third edition is ISBN 0131411551, which is more modern than my copy. It leaves out technologies that are no longer relevant, and spends those pages on fuller coverage of what matters. I can;t vouch for the third edition specifically, but it should be really good stuff.
A handy book that gives useful information on implementing applications that use different network protocols is Internet Core Protocols: The Definitive Guide (ISBN 9781565925724) which includes Perl examples but not exclusively. It comes with a CD which contains all the ISC RFCs and STDs up to a point in time, too.
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