Rajshahi Krishi Unnayan Bank
Post: Assistant Network System Engineer ,
Exam Date: 03.11.2023, Exam Taker: BIBM
Network Address Translation (NAT)
NAT (Network Address Translation) is a technique used to map multiple private IP addresses within a local network to a single public IP address. It allows internal devices to access the Internet while conserving public IP addresses and improving security.
How NAT Works:
- Translation Process: NAT uses a gateway device such as a router or firewall to translate private IP addresses into a public IP address. This gateway acts as an intermediary between internal and external networks.
- Address Representation:
- Private IP addresses (e.g., 10.0.0.1, 192.168.0.1) are used inside local networks and are not routable on the Internet.
- NAT assigns one or a few public IP addresses to represent all internal devices.
- Data Flow:
- Outgoing traffic: NAT replaces the private IP with a public IP before sending data to the Internet.
- Incoming traffic: NAT maps the public IP back to the correct private IP so the data reaches the intended device.
- Security: NAT hides private IP addresses from external networks, reducing direct exposure of internal devices.
Network Address Translation (NAT)
NAT (Network Address Translation) হলো একটি technique যেখানে local network-এর একাধিক private IP address-কে একটি public IP address-এর সাথে map করা হয়। এর মাধ্যমে internal device Internet access করতে পারে এবং public IP address সাশ্রয় ও security নিশ্চিত হয়।
NAT কীভাবে কাজ করে:
- Translation Process: NAT একটি gateway device (router বা firewall) ব্যবহার করে private IP address-কে public IP address-এ translate করে। এই gateway internal ও external network-এর মধ্যে মধ্যস্থতাকারী হিসেবে কাজ করে।
- Address Representation:
- Private IP address (যেমন 10.0.0.1, 192.168.0.1) local network-এর ভিতরে ব্যবহৃত হয় এবং Internet-এ routable নয়।
- NAT একটি বা কয়েকটি public IP address ব্যবহার করে সব internal device-কে represent করে।
- Data Flow:
- Outgoing traffic-এর সময় NAT private IP-এর জায়গায় public IP বসিয়ে Internet-এ data পাঠায়।
- Incoming traffic-এর ক্ষেত্রে NAT public IP থেকে সঠিক private IP-তে data পৌঁছে দেয়।
- Security: NAT internal device-এর private IP address গোপন রাখে, ফলে external network থেকে সরাসরি access কঠিন হয়।
General Part
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