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Subnet Mask در آدرس IP

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Sadeh

(@sadeh)

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۱۹/۱۱/۱۳۹۷ ۹:۱۳ ق.ظ

همراه با آدرس IP همیشه یک subnetmask داریم مثه 255.255.255.0

سوالم اینه که عدد 255 چه مفهومی داره . آیا میشه یه عدد دیگه بجای 255 بکاربرد مثلا 255.255.254.0

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IP Address Subnetmask

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(@en-sh66fazli)

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۱۹/۱۱/۱۳۹۷ ۱۲:۱۴ ب.ظ

سلام بهتر عوض نکنید عوض کنید اون برا کد کردن IP هستش و به کلاس مربوطه رو کد میکنه

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kolahi

(@kolahi)

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۲۶/۱۱/۱۳۹۷ ۱۱:۵۱ ق.ظ

به عنوان مثال

IP : 192.168.0.1

subnet:255.255.255.0

مفهومش اینه که در این شبکه همه نودهایی که IP آنها با سه عدد 192.168.0 شروع میشه می تونند همدیگر را ببینند ولی با همین subnet اگه IP شبکه دیگری 192.168.1 یا 192.168.2 و ... شروع بشه همدیگر را نمی بینین. عدد 255 معادل 1111111 باینری است یعنی IP هایی که 8 بیت یکسان دارند ( دسیمال یکسان دارن) همدیگر را می بینن

اگه در مثال فوق subnet را به 255.255.254 تغییر بدیم عدد 254 معادل 11111110 است و مفهومش اینه که IP های که 7 بیت سمت چپ یکسان دارن همدیگر را می بینن بنابراین IP هایی که با 192.168.0 و 192.168.1 شروع میشن همدیگر را می بینن چون 7 بیت سمت چپ در عدد 0 و 1 مشابه است ولی همین ها IP هایی با 192.168.2 شروع میشن را نمی بینن چون عدد 2 معادل 00000010 هست و عدد 1 معادل 00000001 و در اینها هفت بیت سمت چپ یکی نیست. و به همین صورت بقیه IP ها تحلیل میشن

nimaghadimi و شاهین فضلی پسندیدند

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(@en-sh66fazli)

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۲۸/۱۱/۱۳۹۷ ۱۱:۱۲ ق.ظ

واقعا عالی بود مهندس کلاهی باید اقرار کنم که خیلی خوب و کامل توضیح دادید و ماهم یاد گرفتیم

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