Tarmoqlararo ekran ichki va tashqi perimetrlarning birinchi himoya qurilmasi hisoblanadi. Tarmoqlararo ekran axborot-kommunikatsiya texnologiya (AKT)larida kiruvchi va chiquvchi ma’lumotlarni boshqaradi va ma’lumotlarni filtrlash orqali AKT himoyasini ta’minlaydi, belgilangan mezonlar asosida axborot tekshiruvini amalga oshirib, paketlarning tizimga kirishiga qaror qabul qiladi. Tarmoqlararo ekran tarmoqdan o‘tuvchi barcha paketlarni ko‘radi va ikkala (kirish, chiqish) yo‘nalishi bo‘yicha paketlarni belgilangan qoidalar asosida tekshirib, ularga ruxsat berish yoki bermaslikni hal qiladi. Shuningdek, tarmoqlararo ekran ikki tarmoq orasidagi himoyani amalga oshiradi, ya’ni himoyalanayotgan tarmoqni ochiq tashqi tarmoqdan himoyalaydi.
Inter-network screen is the first protection device of internal and external perimeters. The inter-network screen manages the incoming and outgoing data in information and communication technologies (ICT) and provides ICT protection by filtering data, performs information verification based on the specified criteria, and decides on the entry of packets into the system. The firewall looks at all the packets passing through the network and checks the packets in both directions (inbound, outbound) based on defined rules and decides whether to allow them or not. Also, an inter-network screen provides protection between two networks, that is, it protects the protected network from an open external network.
IPsec protokoli.
Portlarni tekshirish hujumiga qarshi samarali himoya yechimi tarmoqlararo ekran texnologiyasidan unumli foydalanish kutilgan natija beradi. Barcha portlarni bir vaqtda tekshirish haqidagi kelgan so‘rovlarga nisbatan tarmoqlararo ekranga maxsus qoida joriy etish yo‘li bilan hujumni bartaraf etish mumkin.
An effective defense solution against port scanning attack is the effective use of network shielding technology. The attack can be prevented by introducing a special rule on the inter-network screen for incoming requests to check all ports at the same time.
