5. Giati ypodiktyo;

Oi aities pisw apo thn ypo-diktuwsh xronologountai pisw stis prwtes prodiagrafes toy IP - opoy mono ligosta site etrexan se ari8mous diktuoy klashs A, ta opoia epitrepoyn ekatommuria syndedemenoys host.

Prokaleitai profanws megalo kykloforiako kai diaxeiristiko problhma, an oloi oi IP computer se ena megalo site prepei na einai syndedemenoi sto idio diktyo: prospa8wntas na elegjoyme ena tetoio terastio kthnos 8a htan efialths kai to diktyo (sxedon sigoyra) 8a swriastei katw apo to fortio ths idias toy ths kinhshs (koresmos diktuoy).

Kai etsi mpainoyme sthn ypo-diktuwsh: h dieu8ynsh toy diktuoy IP klashs A, mporei na katatmh8ei, wste na epitrecei ton diamoirasmo ths se merika (an oxi polla) jexwrista diktya. H diaxeirish ka8e tetoioy jexwristou diktuoy mporei epishs na metabibastei.

Ayto epitrepei th dhmioyrgia mikrwn, diaxeirisimwn diktuwn - polu pi8anon xrhsimopoiwntas diaforetikes texnologies diktuwshs. 8ymh8eite, de mporeite na anamijete Ethernet, Token Ring, FDDI, ATM klp. sto idio fysiko diktyo - mporoun parol' ayta na diasynde8oun!

¢lloi logoi ypodiktuwshs einai:-

• H fysikh katanomh toy site einai dynaton na dhmioyrgei periorismous (mhkos kalwdiwn) sxetikous me to pws h fysikh ypodomh mporei na synde8ei, apaitwntas pollapla diktya. H ypo -diktuwsh epitrepei thn ylopoihsh toy parapanw, se ena periballon IP, xrhsimopoiwntas ena mono ari8mo diktuoy IP.
  
  Oysiastika to parapanw ginetai polu syxna apo toys ISPs, poy epi8ymoun na dinoyn stoys, monima syndedemenoys pelates toys me topika diktya, statikous ari8mous IP.
• O fortos toy diktuoy einai arketa ychlos, wste na prokalei shmantikes epibradunseis. Me to na xwrizoyme to diktyo, xrhsimopoiwntas ypodiktya, h kinhsh poy einai topikh se kapoio diktyako tmhma, kratietai topikh - meiwnontas thn synolikh kinhsh kai epitaxunontas thn syndesimothta me to diktyo xwris thn apaithsh perissoteroy pragmatikou diktyakou bandwidth (xwrhtikothta)
• Oi prodiagrafes asfaleias mporei epishs na ypagoreuoyn pws diaforetikes klaseis xrhstwn de moirazontai to idio diktyo - ka8ws h kinhsh se ena diktyo mporei panta na ypoklapei apo enan "sxetiko" xrhsth. H ypo-diktuwsh parexei ena tropo na krathsoyme to Tmhma Prow8hshs apo to na parakoloy8ei/ypokleptei thn diktyakh kinhsh toy Tmhmatos Ereynas kai Anaptyjhs (R & D) (h toys foithtes apo to na ypokleptoyn to diktyo toy Tmhmatos Diaxeirishs)!
• Uparjh ejoplismou poy xrhsimopoiei asumbates diktyakes texnologies, kai h anagkh na tis diasyndesete kai aytes (opws anafer8hke kai parapanw).