bedazzled@desktop /mnt/files/reading/ebooks/unsorted $ gunzip -dc CISCOmulticrouting.zip
gunzip: CISCOmulticrouting.zip has more than one entry--rest ignored
bedazzled@desktop /mnt/files/reading/ebooks/unsorted $ gzip -dc CISCOmulticrouting.zip
gzip: CISCOmulticrouting.zip has more than one entry--rest ignored
bedazzled@desktop /mnt/files/reading/ebooks/unsorted $ unzip CISCOmulticrouting.zip
Archive:  CISCOmulticrouting.zip
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of CISCOmulticrouting.zip or
        CISCOmulticrouting.zip.zip, and cannot find CISCOmulticrouting.zip.ZIP, period.
bedazzled@desktop /mnt/files/reading/ebooks/unsorted $ file CISCOmulticrouting.zip
CISCOmulticrouting.zip: Zip archive data, at least v1.0 to extract