Efficient System Administrator

n ntrsn dtctn systm (DS) s dvc r sftwr pplctn tht mntrs ntwrk r systms fr mlcs ctvty r plcy vltns. ny ntrsn ctvty r vltn s typclly thr rprtd t n dmnstrtr r cllctd cntrlly sng scrty nfrmtn nd vnt mngmnt (SM) systm. SM systm cmbns tpts frm mltpl srcs nd ss lrm fltrng tchnqs t dstngsh mlcs ctvty frm fls lrms. DS typs rng n scp frm sngl cmptrs t lrg ntwrks. Th mst cmmn clssfctns r ntwrk ntrsn dtctn systms (NDS) nd hst-bsd ntrsn dtctn systms (HDS). systm tht mntrs mprtnt prtng systm fls s n xmpl f n HDS, whl systm tht nlyzs ncmng ntwrk trffc s n xmpl f n NDS. t s ls pssbl t clssfy DS by dtctn pprch. Th mst wll-knwn vrnts r sgntr-bsd dtctn (rcgnzng bd pttrns, sch s mlwr) nd nmly-bsd dtctn (dtctng dvtns frm mdl f "gd" trffc, whch ftn rls n mchn lrnng). nthr cmmn vrnt s rpttn-bsd dtctn (rcgnzng th ptntl thrt ccrdng t th rpttn scrs). Sm DS prdcts hv th blty t rspnd t dtctd ntrsns. Systms wth rspns cpblts r typclly rfrrd t s n ntrsn prvntn systm (PS). ntrsn dtctn systms cn ls srv spcfc prpss by gmntng thm wth cstm tls, sch s sng hnypt t ttrct nd chrctrz mlcs trffc.