Network Programming Interview FAQs in C++

C is a popular programming language, especially in the field of network programming. Its efficient and stable performance make it the first choice for programmers. In C network programming interviews, there are some common questions, let us discuss them one by one.

1. What is Socket?

Socket is a programming interface that can realize network data transmission. Socket is divided into server Socket and client Socket. The client Socket communicates with the server locally, and the server Socket waits for the client's connection request and processes it accordingly. Socket uses TCP or UDP protocol for data transmission.

2. What is the difference between TCP and UDP?

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two common network transmission protocols. TCP provides a reliable, connection-oriented transmission service, which ensures the integrity of data and the order of transmission, but the transmission speed is relatively slow. UDP provides an unreliable, connectionless transmission service. Its transmission speed is very fast, but the integrity of the data is not as good as TCP, and the order of transmission is not guaranteed.

3. What are blocking and non-blocking?

Blocking and non-blocking refer to the way I/O operations are handled. Blocking I/O means that after a process initiates an I/O operation, it will wait for the I/O operation to complete and continue other operations until the operation is completed. Non-blocking I/O does not wait for the I/O operation to complete, but immediately returns an error code or an indicator symbol to allow the process to perform other operations.

4. What is multiplexing?

Multiplexing refers to processing multiple I/O requests in one process at the same time. It allows the process to wait for the completion of multiple operations at the same time, and only needs to occupy one process, thereby improving the process efficiency. s efficiency. In C, multiplexing techniques such as select, poll, and epoll can be used.

5. What is the SO_REUSEADDR option?

SO_REUSEADDR is a commonly used Socket option, which allows the port to be reused immediately after startup without waiting for the timeout, thereby increasing the concurrency performance of the Socket.

6. What is TCP sticky packet?

TCP sticky packet means that when the TCP protocol transmits data, multiple small data packets are merged into one large data packet and received, that is, the size of the data block is increased to form a data packet. adhesion phenomenon. In C network programming, you can solve the TCP sticky problem by setting the data length, adding specific terminators, or using delimiters.

7. What is Socket buffer?

Socket buffer refers to a special buffer used by Socket when transmitting data. During data transmission, the data will be written into the Socket buffer first, and then transmitted to the other party and received at the same time. The received data will first be stored in the Socket buffer and then read by the user process. In C network programming, network transmission performance can be optimized by setting the Socket buffer size and adjusting the SO_RCVBUF and SO_SNDBUF options.

In general, in the C network programming interview, we need to understand the Socket programming interface, TCP and UDP protocols, blocking and non-blocking I/O, multiplexing, Socket options, TCP sticky packets As well as concepts such as Socket buffers, and the ability to optimize network transmission performance. I hope this article can provide you with some help in your network programming interview.

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