{"id":4251,"date":"2020-10-30T19:57:46","date_gmt":"2020-10-30T18:57:46","guid":{"rendered":"https:\/\/webhosting.de\/softwarefirewall-oder-hardwarefirewall\/"},"modified":"2020-10-30T19:57:46","modified_gmt":"2020-10-30T18:57:46","slug":"softwarefirewall-eller-hardwarefirewall","status":"publish","type":"post","link":"https:\/\/webhosting.de\/da\/softwarefirewall-oder-hardwarefirewall\/","title":{"rendered":"softwarefirewall eller hardwarefirewall"},"content":{"rendered":"

Software- eller hardwarefirewall - forskelle og anvendelsesomr\u00e5der<\/p>\n

Begge muligheder giver beskyttelse til din egen pc og det tilh\u00f8rende netv\u00e6rk. I praksis anvendes begge muligheder normalt sidel\u00f8bende, selv i private applikationer. Begge l\u00f8sninger, b\u00e5de via hardware og via den software, der skal installeres, har altid en afsk\u00e6rmende effekt. Forbindelser b\u00f8r derfor kontrolleres og om n\u00f8dvendigt blokeres for at forhindre uautoriseret indtr\u00e6ngen i nettet.<\/p>\n

Hvad er egentlig en Firewall<\/a>?<\/p>\n

Firewallen er et ekstra sikkerhedssystem, som ikke m\u00e5 forveksles med antivirusprogrammer p\u00e5 pc'en. Mens sidstn\u00e6vnte skal identificere og isolere skadelige programmer, overv\u00e5ger firewallen forbindelser samt udg\u00e5ende og indg\u00e5ende data. Data<\/a> i netv\u00e6rket. Det er integreret som et ekstra system mellem pc'en og internettet\/netv\u00e6rket. En firewall kan bl.a. forhindre uautoriserede personer i at komme ind p\u00e5 netv\u00e6rket og dermed f\u00e5 adgang til pc'en og dens data. <\/p>\n

Desuden forhindres ogs\u00e5 overf\u00f8rsel af uautoriserede datapakker, f.eks. skadelige \"orme\". I praksis er en firewall endda nyttig, n\u00e5r det drejer sig om udg\u00e5ende data. Her forhindrer den f.eks. en pc, der er identificeret med malware, i at sende data til andre computere i netv\u00e6rket. Dette sker normalt uden brugerens direkte viden, da malware selv tager initiativ til disse dataoverf\u00f8rsler. En firewall kan derfor forhindre spredning af orme og lignende.<\/p>\n

Forskelle mellem en software firewall og en hardware firewall<\/p>\n

For at belyse forskellene n\u00e6rmere er det f\u00f8rst n\u00f8dvendigt at finde ud af, hvad der er forskellen mellem begreberne \"software\" og \"hardware\". Hardware defineres som elektroniske og\/eller mekaniske produkter og komponenter, der anvendes i forbindelse med anden teknologi for at sikre deres funktionalitet. Hardware eksisterer derfor \"faktisk\" i den forstand, at den kan ber\u00f8res, skrues af og unders\u00f8ges. Software er derimod programmer, der installeres p\u00e5 pc'en og best\u00e5r s\u00e5ledes af data og utallige kodelinjer. De kan ikke ber\u00f8res, men de l\u00e5ser op for funktioner p\u00e5 pc'en, hvis grundlag er hardwaren. En hardwarebaseret firewall er derfor en mekanisk eller elektronisk enhed, mens firewallen er installeret som software p\u00e5 pc'en. I praksis er begge varianter mulige i kombination.<\/p>\n

Hvad g\u00f8r software- og hardwarefirewallen?<\/p>\n

Softwarefirewallen styrer datatrafikken mellem netv\u00e6rket og computeren. Den kan ogs\u00e5 bruges til at indstille forskellige undtagelser for programmer, frigive porte eller til at overv\u00e5ge data p\u00e5 pc'en i realtid. P\u00e5 en m\u00e5de overv\u00e5ger en softwarefirewall et netv\u00e6rk, nemlig det netv\u00e6rk, som pc'en bruger til at f\u00e5 adgang til netv\u00e6rket. Internet<\/a> for at kunne oprette forbindelse. Hardwarefirewallen er p\u00e5 den anden side installeret p\u00e5 en ekstern enhed\/et eksternt system og overv\u00e5ger i praksis to netv\u00e6rk samtidig. Den overv\u00e5ger datatrafikken mellem det private netv\u00e6rk og firewallen og samtidig trafikken mellem firewallen og det overordnede netv\u00e6rk. Et n\u00e6rmere kig p\u00e5 begrebet viser, at en hardwarefirewall mere ligner software, som ikke er installeret p\u00e5 selve pc'en, men p\u00e5 en ekstern enhed.<\/p>\n

I praksis findes den forenklede hardwarefirewall i hjemmet normalt i den klassiske router. Moderne routere har en funktionel firewall, der fungerer i overensstemmelse med ovenn\u00e6vnte praksis. Samtidig b\u00f8r der dog ogs\u00e5 installeres en softwarefirewall p\u00e5 selve pc'en. \u00c6ldre modeller af DSL-modemmer m\u00e5tte stadig undv\u00e6re denne integrerede hardwarefirewall. Industri- og erhvervskunder, der har s\u00e6rligt f\u00f8lsomme data i deres netv\u00e6rk, v\u00e6lger nogle gange en ekstra l\u00f8sning i form af hardware eller yderligere serverbeskyttelse. Kombinationen af en integreret firewall i routeren og en ekstra installeret software p\u00e5 pc'en er derimod helt tilstr\u00e6kkelig for private brugere. Virksomhedsnetv\u00e6rk b\u00f8r under visse omst\u00e6ndigheder s\u00f8ge yderligere beskyttelse og en hardwarefirewall, der er skr\u00e6ddersyet til deres behov, og s\u00f8ge r\u00e5d hos en ekspert.<\/p>","protected":false},"excerpt":{"rendered":"

Software- oder Hardwarefirewall – Unterschiede und Einsatzgebiete Eine Absicherung f\u00fcr den eigenen PC und das damit verbundene Netzwerk bieten beide M\u00f6glichkeiten. In der Praxis werden, auch im privaten Anwendungsbereich, normalerweise beide Optionen erg\u00e4nzend zueinander eingesetzt. Immer haben beide L\u00f6sungen, sowohl via Hardware als auch \u00fcber die zu installierende Software, einen abschottenden Effekt. Verbindungen sollen also 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