Vim li cas Classful chaw nyob tsis muaj chaw nyob?
Vim li cas Classful chaw nyob tsis muaj chaw nyob?

Video: Vim li cas Classful chaw nyob tsis muaj chaw nyob?

Video: Vim li cas Classful chaw nyob tsis muaj chaw nyob?
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Anonim

Classless inter-domain routing (CIDR)

Cov chav kawm IP hais lus system, yog li ntawd, ua pov thawj tias khib nyiab raws li tus IP chaw nyob qhov chaw loj hlob tuaj. CIDR yog ib txoj hauv kev subnetting uas ua rau cov thawj coj tso qhov kev faib nruab nrab ntawm cov khoom siv network thiab tus tswv tsev khoom nyob qhov twg hauv chaw nyob , tsis yog ntawm octets xwb.

Ntawm no, vim li cas Classful hais lus tseem ceeb?

Chav kawm ntawm IP chaw nyob yog siv los txiav txim cov khoom siv rau network ID thiab tus tswv ID thiab tus naj npawb ntawm tag nrho cov tes hauj lwm thiab hosts ua tau hauv cov chav kawm tshwj xeeb. Txhua tus ISP lossis tus thawj tswj hwm network muab tus IP chaw nyob rau txhua lub cuab yeej uas txuas nrog nws lub network.

Kuj Paub, vim li cas feem ntau ntawm qhov chaw nyob hauv Chav A raug nkim? "Ib block in chav kawm A chaw nyob loj heev rau yuav luag txhua lub koom haum. Qhov no txhais tau tias feem ntau ntawm cov chaw nyob hauv chav kawm A yog nkim thiab tsis siv. Ib block hauv chav kawm C yog tej zaum me me heev rau ntau cov koom haum." A chav kawm Ib lub subnet muaj 24 ntsis tsim nyog hais lus , uas yog txaus rau yuav luag 17 lab tus tib neeg li.

Ib yam li ntawd, qhov tsis zoo ntawm Classful addressing yog dab tsi?

Muaj ntau yam teeb meem nrog classful chaw nyob ; qhov loj tshaj plaws uas tshwm sim los ntawm tsis muaj chav kawm network uas tuaj yeem txhawb nqa qhov nruab nrab qhov loj. Feem ntau, Class C network txhawb nqa 254 tus tswv yog qhov tsawg dhau, thaum Class B network txhawb nqa 65, 534 tus tswv yog qhov loj heev.

Puas yog Classful addressing tseem siv tau?

IPv4 chaw nyob cov chav kawm yeej tsis muaj lawm, thiab tau raug deprecated nyob rau hauv 1993. Yog hais tias koj saib cov qub routing protocols qub koj tuaj yeem tau kawg. tseem saib cov kev xav uas lawv tau ua raws li chaw nyob chav kawm, tab sis qhov ntawd yog 20 xyoo dhau los classful chaw nyob yog "ib yam ntawm yav dhau los".

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