Dab tsi yog classless chaw nyob hauv IPv4?

2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47

Classless IPv4 Chaw Nyob

Classful hais lus faib tus IP chaw nyob mus rau hauv Network thiab Host feem raws octet ciam teb. Classless chaw nyob kho tus IP chaw nyob raws li 32-ntsis kwj ntawm ib qho thiab xoom, qhov twg ciam teb ntawm network thiab cov tswv cuab feem tuaj yeem poob qhov twg ntawm ntsis 0 thiab bit31.

Tsis tas li ntawd, qhov txawv ntawm Classful addressing thiab classless addressing hauv IPv4 yog dab tsi?

Ob nqe lus hais txog qhov kev xav ntawm tus qauv ntawm asubnetted IP chaw nyob . Classless chaw nyob siv ob feem saib ntawm IP chaw nyob, thiab classful chaw nyob muaj peb feem saib. Nrog classful chaw nyob , cov chaw nyob ib txwm muaj 8-, 16-, lossis 24-ntsis network teb, raws li Chav Kawm A, B, thiab C hais lus txoj cai.

Ib sab saum toj no, vim li cas peb siv classless IP chaw nyob? Classless Internet hais lus . Yog li ntawd, nyob rau hauv thaum ntxov 1990s, Internet tau tsiv tawm ntawm ib tug chav nyob space rau a classless chaw nyob qhov chaw. Hauv lwm lo lus, tus naj npawb ntawm cov khoom siv rau ib feem ntawm lub network IP chaw nyob ua variable es tsis txhob ruaj. Lub network feem ntawm classful IP chaw nyob yog kho.

Ntxiv mus, lub npog ntsej muag yog dab tsi hauv IPv4 chaw nyob?

Nws yog hu ua subnet daim npog qhov ncauj vim nws yog siv los txheeb xyuas qhov chaw nyob network ntawm tus IP chaw nyob los ntawm kev ua haujlwm bitwiseAND ntawm netmask. Ib Subnet daim npog qhov ncauj yog 32-bitnumber uas daim npog qhov ncauj tus IP chaw nyob, thiab faib tus IP chaw nyob rau hauv lub network chaw nyob thiab chaw nyob host.

Dab tsi classless hais lus?

Classless Chaw Nyob yog ib qho kev txhim kho IP Chaw nyob qhov system. Nws ua rau kev faib tawm ntawm IP Chaw nyob siv tau ntau dua. Nws hloov cov qub chav kawm hais lus system raws li cov chav kawm. Nws tseem hu ua Classless Inter Domain Routing ( CIDR ).