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Vol3 – Giao thức UDP – Backend Engineer – Cơ bản (Beginner level)
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Yuh laptrinhvien cơbản backend beginner protocol UDP engineer coding cntt laptrinh
Ủng hộ mình tại: 00728491001 TPBANK DO THANH 1 TRAN NGOC HUY
Backend Engineer Cơ Bản Playlist https://www.youtube.com/playlist?list=PLwL1SGSvTEcBzw9FsP5UFWqrErzS2jE2
Nhập môn Golang cơ bản Playlist https://www.youtube.com/playlist?list=PLwL1SGSvTEco7QvKTEd39wrMoTCPNUuN
Leetcode Playlist 1 Vol (0 199) https://www.youtube.com/playlist?list=PLwL1SGSvTEdxR0nCUvHf1tl6n22UoVfb
Leetcode Playlist 2 Vol (200 399) https://www.youtube.com/playlist?list=PLwL1SGSvTEdnuu1pNcjjPkzjxWaX8qtn
Leetcode: https://leetcode.com/problemset/all/
0:00 Giới thiệu
00:40 Truyền thông tin trên kết nối
01:40 Ưu điểm
02:56 Nhược điểm
04:09 Các ứng dụng của UDP
06:36 Demo
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Giới thiệu sơ lược bản thân:
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ARP Explained – Address Resolution Protocol
What is ARP? This is an animated video explaining how ARP (address resolution protocol) works. ARP resolves an IP address to a MAC address.
Understanding TCP/UDP Protocols with the help of OSI Model.
OSI Model Explained,
So, we have seen the TCP/IP Model. Actually this was a derived model and is used today. But the original model on which the TCP/IP model was based, is called the OSI Model. This model has 7 layers, instead of 4 that we see in the TCP/IP model. The essential overall function of both the models remains the same, just that in the OSI model their work has been split into 7 layers.
Now let us look at the function of each layer of the OSI model in detail.
So, just like in the TCP/IP model, the data in the OSI model also passes from layer 7 to layer 1 at the sender’s end and from layer 1 to layer 7 at the receiver’s end.
Application Layer This layer provides an interactive interface for the user to enter and view data. One can give inputs in the form of text, audio, images, files, etc. The browser makes up the application layer.
Presentation Layer After the application layer, the data passes to the presentation layer. This is where the data is converted into computer friendly format, i.e in binary code. So, the presentation layer encodes the input, compresses it, and encrypts it if required. Then the data is sent to the next layer.
Session Layer This layer initiates a connection and creates a session, so that some context can be provided to the communication between the two devices.
Transport Layer This layer establishes an application level connectivity. For this, it attaches the source and destination port numbers.
It also performs the task of error control, which means that it makes a checklist, so that it can be cross checked at the receiving end to ensure that all the data is transferred properly and not destroyed on the way. These checklists are known as checksums.
Network Layer At the network layer, the source and destination IP addresses are attached, for the purpose of identification of devices, and to decide the virtual path that needs to be taken by the data packet. So, we can say that this layer does network level routing and pathing of packets.
Data Link Layer This layer attaches the source and destination MAC addresses, which are used to identify the hardware of the device. It also calculates checksums for error checking of the metadata that has been attached at all the previous layers, and also to manage the flow of data.
Physical Layer This is where the data is converted to hardware friendly signals, like radio signals, light signals, or electric signals, depending on the hardware that is being used for data transfer.
This is the order in which the data passes at the sender’s end. At the receiver’s end, the order of the layers is reversed.
Now, don’t worry if you cannot remember all this information. We have some simple tricks for you. A simple mnemonic that can used to remember the order of the layers from layer 7 to layer 1 is:
All People Seem To Need Data Processing
So that was all about the OSI model.
Application Protocol ที่ต้องรู้จัก โดย Mr.Jodoi
Application Protocol ที่ต้องรู้จัก โดยอาจารย์เกรียงศักดิ์ นามโคตร (Mr.Jodoi)
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Why would you choose the unreliable UDP protocol over TCP?
Compared to TCP, UDP seems less useful. It drops packets and provides no guidance on how fast packets should be sent. But there are some very important internet applications that can benefit from unreliable packet delivery and sometimes suffer due to TCP’s guarantees. Typical to the design of the rest of the internet, the overall goal is flexibility. UDP allows applications that do not need TCP’s guarantees to avoid them.
Credits: Talking: Geoffrey Challen (Assistant Professor, Computer Science and Engineering, University at Buffalo). Producing: Greg Bunyea (Undergraduate, Computer Science and Engineering, University at Buffalo).
Part of the https://www.internetclass.org online internet course. A blue Systems Research Group (https://blue.cse.buffalo.edu) production.
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