Engineering Clinic

Aim: To design and simulate a DNS query-response mechanism over UDP sockets using NS3. The client sends QUERY:<domain> packets to a DNS server through a router; the server replies with ANSWER:<domain>:<ip> or NXDOMAIN. The experiment measures throughput, delay, and packet delivery ratio, and visualises packet flow using NetAnim and Gnuplot. Prompt: "Implement a simple DNS query-response application over UDP sockets in NS3. The simulation should include a DNS Client node, a Router, and a DNS Server node connected via point-to-point links. The client should send DNS queries (QUERY:<domain>) and the server should respond with IP addresses (ANSWER:<domain>:<ip>) or NXDOMAIN. Include NetAnim animation output, FlowMonitor statistics, and Gnuplot graph generation for throughput and delay. LLM used: Claude (Anthropic), Gemini Source Code: #include "ns3/core-module.h" #include "ns3/network-module.h" #include "ns3/inte...

Performance Analysis of TCP Reno Congestion Control Under Varying Round-Trip Time Conditions: An ns-3 Simulation Study   PROMPT Part 1: You are an expert in ns-3 network simulation and C++. I want you to design and implement a complete ns-3 simulation in C++ to analyze the performance of TCP Reno over a point-to-point link with varying RTT values (10 ms to 200 ms). Requirements: Simulation Setup ●         Create a point-to-point network topology (2 nodes). ●         Configure link parameters such as: ○         Data rate (choose a reasonable default like 5 Mbps or 10 Mbps) ○         Packet size ○         Queue type (DropTail or similar) ●         Use TCP Reno as the transport protocol. ●         Ensure RTT varia...