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sandeepparekh9 109 Posting Whiz

hi everyone,

i was wondering if anyone can guide me regarding TCP/IP programing in c# or vb.net .

like what interview question can be asked here, some basic tutorials etc.


thanks in advance

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Dani AI

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A compact primer for focused on interview prep and practical work in C# or VB.NET. Core topics: socket fundamentals (TCP vs UDP), connection lifecycle (three-way handshake, teardown), partial reads/writes and framing, blocking vs asynchronous I/O, thread-safety and connection scaling, timeouts/retransmission basics, TLS via SslStream, and common tooling for debugging (Wireshark, netstat, telnet/nc). Familiarity with System.Net.Sockets (TcpListener, TcpClient, Socket) and the async/await pattern is expected in interviews.

Concrete, testable exercises that interviewers like: build a simple echo server/client with TcpListener/TcpClient; implement a UDP broadcast listener; design a small length-prefixed request/response protocol and show correct handling of partial reads; convert a synchronous server to Task-based async and add cancellation/timeouts; add TLS using SslStream. Typical interview questions: differences between TCP and UDP; how to handle partial reads; framing strategies (length-prefix vs delimiters); when to use Socket vs TcpClient; how to harden and test a network service.

Implementation tip and common pitfalls: use a length-prefix so reads loop until the full payload is received, e.g. var len = BitConverter.GetBytes(payload.Length); stream.Write(len,0,4); stream.Write(payload,0,payload.Length); then read 4 bytes for length and loop to read the payload. Watch for blocking calls on UI threads, missing Dispose, firewall/OS port blocking, and unbounded thread creation. For reference, see the .NET API docs for TcpClient: TcpClient - Microsoft Docs.

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