00477nam a2200157Ia 4500020001800000082001700018100001600035245003800051260004800089300001600137440004100153504001900194650002100213650004300234650004200277  a0 521 33992 8  a004.65 RUS-;  aRussell, D. 0aPrinciples of computer networking  aCambridgebCambridge University Pressc1989  axiii, 513p.  aCambridge computer science texts; 25  aIncludes index  aComputer science  aComputer networks - Study and teaching  aComputer networks - Security measures