(TeX-add-style-hook "tcpip_fundamentals"
 (function
  (lambda ()
    (LaTeX-add-labels
     "cha:fundamentals-of-tcpip"
     "sec:encapsulation"
     "sec:ip-headers"
     "sec:tcp-header"
     "sec:udp-header"
     "sec:lw_address_class"))))