计算机面试常见问答题目

英语口语

自我介绍

Hello, teachers. My name is Wang Xu. I come from Ningxia. I graduated from the School of Computer Science, Xi 'an Jiaotong University, majoring in Internet of Things. Next, I will introduce myself from four aspects.
First of all, I studied hard, ranked in the top 40% of my major, and won academic scholarship and school-level commendation.
Secondly, as an engineering student, I also took an active part in some professional competitions in my spare time and achieved good results.
Personally, I love computer science. I have a stable personality and strong self-driving ability.
In the future, I hope to join the scientific research team of Jiaotong University, strive to improve my professional quality and literature writing ability, and write high-quality papers under the guidance of my supervisor. Of course, this is my idea, and I will make adjustments according to my learning situation and the suggestions of my tutor. This is the end of my introduction. Thank you for your listening.

为何考研

First, I have a dream to be a scientist.And over the years, that desire has grown stronger.Among the many choices, I chose graduate school without hesitation.
Secondly, at the undergraduate stage, I have a strong interest in computers.
In some practices, I found that I still have a lot of knowledge shortcomings.
Therefore, I want to improve myself further.

介绍家乡（学校）

I have studied and lived here for many years, and I deeply understand that Xi’an Jiaotong University is a very good platform.There is a good environment here, and the people around are very enthusiastic.
Everyone has goals to strive for, such as scientific research and social services.I also hope that I can become a good person.

专业问题

操作系统

堆栈区别？

栈：是由编译器在需要时自动分配，不需要时自动清除的变量存储区。通常存放局部变量、函数参数等。
堆：是由new分配的内存块，由程序员释放（编译器不管），一般一个new与一个delete对应，一个new[]与一个delete[]对应。如果程序员没有释放掉， 资源将由操作系统在程序结束后自动回收。

ipv4和ipv6，tcp和udp的区别

ipv6头部字段长，可分配的地址多。v4地址4字节，v6地址16字节。v6提供身份验证和加密。
TCP提供面向连接的、可靠的数据流传输，而UDP提供的是非面向连接的、不可靠的数据流传输。
TCP传输单位称为TCP报文段，UDP传输单位称为用户数据报。
TCP注重数据安全性，UDP数据传输快少了许多操作，但是其安全性却一般。

流量控制、拥塞控制用在那些层？常见算法？