Cov txheej txheem:
Video: Dab tsi yog ntau txoj cai nkag rau kev tswj hwm channel?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
9. Qhov twg hauv qab no yog tus ntau txoj cai nkag mus rau kev tswj hwm channel ? Kev piav qhia: Hauv CSMA / CD, nws cuam tshuam nrog kev tshawb nrhiav kev sib tsoo tom qab kev sib tsoo tau tshwm sim, qhov CSMA / CA cuam tshuam nrog kev tiv thaiv kev sib tsoo. CSMA/CD yog cov ntawv luv rau Carrier Sensing Kev nkag tau ntau yam / Sib tsoo nrhiav pom.
Ntawm no, dab tsi yog cov txheej txheem nkag mus rau ntau yam?
Kev nkag mus ntau yam raws tu qauv . Multiple access raws tu qauv Multiple access protocol yog siv los ua kev sib koom tes nkag mus mus rau qhov txuas. Nodes tuaj yeem tswj hwm lawv cov kev sib kis mus rau qhov sib koom tshaj tawm hauv xov tooj cua los ntawm kev siv Kev nkag mus ntau yam raws tu qauv . Nws yog siv ob qho tib si wired thiab wireless hauv cheeb tsam hauv cheeb tsam Text network thiab satellite network.
Ib sab saum toj no, cov txheej txheem nkag tau siv ntau npaum li cas hauv 4g? Peb tiam xov tooj ntawm tes technology siv code faib ntau yam nkag ( CDMA ). 4G cellular kev sib txuas lus siv ua ntej version ntawm FDMA scheme i.e. OFDMA ( Orthogonal Frequency Division Multiple Access ). Cov tiam no siv pob ntawv hloov txoj hauv kev rau kev xa cov ntaub ntawv.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog tswj kev nkag tau raws tu qauv?
Tswj Kev Nkag Mus Nkag hauv Computer Network. Hauv tswj kev nkag , cov chaw nres tsheb nrhiav cov ntaub ntawv los ntawm ib leeg mus nrhiav seb lub chaw nres tsheb twg muaj cai xa. Nws tso cai tsuas yog ib qho xa mus rau ib lub sijhawm, kom tsis txhob muaj kev sib tsoo ntawm cov lus ntawm kev sib koom nruab nrab.
Dab tsi yog qhov sib txawv ntawm ntau hom kev nkag tau?
Hauv qab no yog peb hom kev siv ntau yam kev nkag
- FDMA (Frequency Division Multiple Access)
- TDMA (Time Division Multiple Access)
- CDMA (Code Division Multiple Access)
Pom zoo:
Qhov twg hauv qab no yog suav tias yog kev tswj hwm kev ua haujlwm ntawm kev tswj hwm database DBMS)?
Databases uas nqa lawv cov ntaub ntawv nyob rau hauv daim ntawv ntawm cov ntxhuav thiab uas sawv cev rau kev sib raug zoo siv txawv teb chaws yuam sij yog hu ua discrete databases. Kev tswj hwm kev ua haujlwm ntawm kev tswj hwm qhov system (DBMS) suav nrog thaub qab cov ntaub ntawv database
Kev tswj hwm dab tsi yog qhov sib txawv ntawm kev tswj ua ntej Java?
Ntau hom kev tswj hauv AWT Button. Canvas. Checkbox. Kev xaiv. Thawv. Daim ntawv lo. Sau npe. Scrollbar
Dab tsi yog qee qhov tsis zoo ntawm lub sijhawm stamping txoj hauv kev rau kev tswj hwm kev sib raug zoo?
Qhov tsis zoo ntawm lub sij hawm stamping mus kom ze yog tias txhua tus nqi khaws cia hauv cov ntaub ntawv yuav tsum muaj ob lub sij hawm thwj ntxiv: ib qho rau lub sijhawm kawg ntawm daim teb tau nyeem thiab ib qho rau qhov hloov tshiab kawg. Lub sij hawm stamping yog li ua rau kom nco xav tau thiab cov ntaub ntawv ua haujlwm nyiaj siv ua haujlwm
Kev tswj hwm kev tswj hwm hauv kev ruaj ntseg ntaub ntawv yog dab tsi?
Kev tswj hwm kev nyab xeeb (tseem hu ua cov txheej txheem tswj hwm) feem ntau yog cov txheej txheem thiab cov cai uas tau muab tso rau hauv qhov chaw los txheeb xyuas thiab qhia cov neeg ua haujlwm hauv kev cuam tshuam nrog cov koom haum cov ntaub ntawv rhiab
Qhov kev tswj hwm twg suav nrog kev tswj hwm lub cev thiab kev tswj hwm?
Piv txwv suav nrog kev tswj lub cev xws li laj kab, xauv, thiab lub tswb nrov; kev tswj xyuas xws li antivirus software, firewalls, thiab IPSs; thiab kev tswj hwm kev tswj hwm xws li kev sib cais ntawm lub luag haujlwm, kev faib cov ntaub ntawv, thiab kev tshuaj xyuas