protocol development career

The development of a marketing career could be roughly divided into three stages. ** I. Exploration period for new employees (1 - 3 years)** In the early stages of working in the marketing department, this was the exploration and preparation stage. During this period, you should try different marketing jobs, such as design, video editing, business development, public relations media, content marketing, etc., or full-chain jobs such as public relations, branding, product marketing, etc. Through extensive contact, he could understand his interests and determine his future direction. ** 2. Professional cultivation during the growth period (4 - 8 years)** Once you have determined your field of expertise and achieved certain results in it, you need to deepen your professional abilities and strive to become an indispensable expert in that field. For example, in the field of content marketing, one must deeply master the skills of creating high-quality content to achieve low-cost communication; In the aspect of private domain operations, one must skillfully use big data, SPD, SCLM and other tools to group and reach customers; If you are engaged in overseas distribution work, you need to have a deep understanding of the culture and consumer behavior of the target market; In the position of product marketing, you must accurately relate product sales performance, etc. ** 3. Choice of a veteran MKO (9 years and above)** After working for more than nine years and becoming a veteran, he was faced with an important choice. They could continue to work in existing companies and become internal authorities and executives to play a leading and decision-making role. They could also transform into a consultant serving multiple companies and use their rich experience to provide marketing strategies for different companies. They could also rely on their own professional abilities to start a business. From the perspective of job development, in the current marketing industry, the most popular jobs in the next five years were content marketing, private domain operations, overseas launch, product marketing, and so on. In the case of tight marketing budget, content marketing could create high-quality content at low cost to achieve communication effect and accurate delivery to expand its influence; private domain operations focused on precise matching and fine operation of existing traffic; overseas delivery increased with the expansion of domestic enterprises in overseas markets; product marketing GTL positions were directly related to product sales performance, so they were more attractive during economic downturns. In the process of career development, one had to pay attention to the changing trends in the industry. In recent years, the competition in the industry had become increasingly fierce. The influx of graduate students, overseas students, and famous students had intensified the competition for talents in the industry. At the same time, the opportunities for promotion in the company were not as good as before. The requirements for marketing personnel in the company had changed from the past to the past. They needed to constantly improve themselves and be prepared for danger in times of peace. "When a programmer meets a psychologist" is equally exciting. Everyone is welcome to click to read it!

GGN (N-step Backward Agreement): - The sender's theory: - The sender uses the pipeline technology to allow multiple packets to be sent without waiting for acknowledgment, but it is limited by the number of unacknowledged packets in the pipeline cannot exceed the maximum number N. When the upper layer calls the send function (rdt_send ()), the sender first checks whether the send window is full (i.e., whether there are N sent but unacknowledged packets). If the window is not full, a packet is generated and sent, and the relevant variables are updated at the same time. If the window is full, the sender can choose to return the data to the upper layer (in reality, it is more likely to buffer the data or use a synchronization mechanism. The upper layer is only allowed to call the send function when the window is full). - The receiver acknowledges the packet with the sequence number n in a cumulative manner, indicating that the receiver has correctly received all the packets before and including the sequence number n. - If there is a time out (the timer is used to detect the loss of data or acknowledgment packets), the sender will resend all the packets that have been sent but not acknowledged. - Principle of the receiver: The receiver receives the packets and uses the cumulative confirmation method to feedback the situation of the correctly received packets to the sender. PR (select the replay protocol): - The sender and receiver had their own windows. The sender sends the packet without knowing the position of the receiver's window, and the receiver receives the packet without knowing the position of the sender's window. The two windows are not synchronized. - The problem was that if the size of the sequence number space and the window size did not meet a certain condition (for example, a scenario where the size of the sequence number space was 4 and the window size was 6 would be problematic), the receiver might not be able to distinguish between different situations. For example, the receiver might mistake the retransmitted packet as a new packet and receive it incorrectly. Different from the GGN protocol, the ACK (n) and TimeOut (n) in the GGN protocol would cause a lot of resources to be retransmitted, resulting in a waste of resources. The SSR protocol was more selective in dealing with situations such as retransmissions. "Choose" was equally exciting. Everyone was welcome to read it!

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The career development expectations of programmers were usually diverse, mainly in the following areas: ** I. In-depth development in the field of technology ** 1. ** Become a technical expert ** - Many programmers want to focus on technology and delve into specific fields, such as becoming data scientists, artificial intelligence engineers, or security experts. As technology continued to be refined and deepened, becoming an expert in a certain field could play an important role in technological innovation and solving complex technical problems. It could also gain high recognition and respect in the industry. 2. ** Keep up with the pace of technological updates ** - Due to the rapid technological changes, programmers expected to continue learning new programming languages, algorithms, and data structures. They hoped to continuously improve their technical capabilities and write more efficient and secure code to adapt to the changing needs of the project and maintain an advantage in the technical competition. ** 2. Transformation of Management Position ** 1. ** Take up a management position ** - Some experienced programmers were eager to switch to management positions, such as project managers or technical directors. In these positions, they could be responsible for team management and project coordination. This required not only a technical background to understand the technical requirements of the project, but also leadership, communication, and project management skills to ensure that the project was completed on time and met the customer's needs. ** 3. Start a business ** 1. ** Start a business with a technical background ** - Some programmers had the desire to start a business. They wanted to use their technical background to develop new products or services. Although the process of starting a business was full of challenges, such as raising funds, marketing, team building, etc., successful start-ups could bring rich returns, realize their own innovative ideas, and have a greater impact on the development of the industry. ** 4. Transfer to other related fields ** 1. ** Get involved in other fields ** - Some programmers might choose to switch careers into other fields, such as product management, marketing, or consulting. They relied on the logical thinking, problem solving skills, and deep understanding of technical products that they had cultivated in the programming process to find new development opportunities in these fields and broaden their career path. ** 5. Work and Life Balance ** 1. ** Flexible work arrangements ** - A programmer expected to maintain a work-life balance during their career development. Although many programmers had flexible working hours, they also hoped to have enough time for themselves and their families while satisfying their career development. They wanted to avoid the job fatigue caused by long-term high-intensity work and improve their quality of life. ** 6. Financial returns and job stability ** 1. ** Obtain reasonable economic returns ** - In the process of career development, programmers expected their technical skills and work contributions to be rewarded financially. With the accumulation of experience and the improvement of skills, they hoped that the salary level could continue to increase and maintain a certain degree of competitiveness in the job market to cope with possible career risks. 2. ** Job stability ** - Although the technology industry was changing quickly, programmers still wanted to maintain a certain degree of stability in their career development. Whether it was to develop steadily within the company or to adapt to market changes by constantly improving themselves, they all wanted to avoid the frequent risk of losing their jobs, especially after they grew older (such as avoiding the so-called "35-year-old crisis"). "When a programmer meets a psychologist" is equally exciting. Everyone is welcome to click to read it!

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In the continuous ARQ protocol, the sender maintained a sending window of a certain size, and the packets within the window could be sent continuously without waiting for the other party's acknowledgment. The sender would slide the sending window forward by one packet every time it received an acknowledgment. The receiver usually uses the method of accumulating acknowledgement, that is, after receiving several packets, it sends an acknowledgement to the last packet that arrives in order, indicating that all the packets up to this packet have been received correctly. However, this method has shortcomings. For example, when the middle packet is lost, the sender cannot know the situation of the subsequent packets, and may need to re-transmit more packets. The sliding window protocol involves a sending window and a receiving window. The transmit window is the range of sequence numbers of the frames that have been sent but have not been acknowledged, and the receive window is the range of sequence numbers of the frames that are expected to be received. When the default window size is 1, you can operate according to the specific sending process. The sliding window protocol could improve the channel utilization and was a reliable transmission mechanism for data communication. The continuous ARQ protocol can be seen as a specific application form of the sliding window protocol under certain conditions (such as the cumulative acknowledgment method). They are all protocol mechanisms that exist to achieve effective and reliable data transmission in the network. "Choose" was equally exciting. Everyone was welcome to read it!

Yes, the selective replay protocol was based on the sliding window flow control technology. It was a sliding window protocol. " Choose " was equally exciting. Everyone was welcome to read it!

Both GGN (Fallback N-frame protocol) and SSR (Random Repeat protocol) were sliding window protocol under the reliable data transmission protocol in computer networks. There were the following differences between the two: 1. ** Receiving window size ** - ** GGN protocol **: Receiving window <br>(W = 1 <br>), which means that the receiver can only receive the data packets that arrive correctly in order. If an error occurs in a data packet, it will cause the subsequent packets to be discarded because they cannot be received in order by the receiver, even if these packets are not error-free and out of order. - ** PR protocol **: If the receiving window size is greater than 1, the receiver can receive packets out of order. 2. ** Confirm Method ** - ** GGN protocol **: uses cumulative acknowledgment. The receiver acknowledges the last frame of a group of frames that arrive in order, indicating that all the frames before this frame have been received. For example, if the sender sends four frames 1, 2, 3, and 4, and the receiver acknowledges frame 4, it means that the four frames 1, 2, 3, and 4 have been received. The previous frames 1, 2, and 3 are no longer separately acknowledged. - ** PR protocol **: Each packet has a separate confirmation mechanism. The receiver can confirm each correctly received packet separately, and the sender can selectively re-transmit the incorrectly received packet according to the confirmation information of the receiver. 3. ** Retransmission mechanism ** - ** GGN protocol **: When the sender receives an acknowledgment for a frame, the sending window will be moved forward. If there is a packet loss or a long delay (such as a timer exceeding), the sender needs to resend all the packets that have been sent but have not been acknowledged. For example, if the sender sends six frames, frame 1, 2, 3, 4, 5, and 6, the receiver will confirm frame 3, and the sender will think that frame 1, 2, and 3 have been sent correctly. If there is a problem later, frame 4, 5, and 6 will need to be retransmitted. - ** PR protocol **: The sender only re-sends the packet that the receiver did not receive correctly, instead of re-transmitting all the sent frames after the acknowledgment frame like the GGN protocol. 4. ** Resource utilization and wastage ** - ** GGN protocol **: Due to the method of accumulating acknowledgement and returning N frames of retransmissions, the error of one packet may lead to the retransmissions of multiple packets, even if these packets themselves are error-free. This causes a waste of resources to a certain extent, especially when the window is large and the bit error rate is high. A large number of unnecessary packets may be frequently retransmitted. - ** SP protocol **: Compared to the GGN protocol, it is more resource-saving because it only reforwards the packets that the receiver did not receive correctly, avoiding unnecessary packet retransmissions and thus improving the channel utilization. However, there were some problems with the SSR protocol. For example, the receiver and sender windows were not synchronized, which could cause errors. "Choose" was equally exciting. Everyone was welcome to read it!

The Address Resolution Protocol was a network layer protocol. It was between the data link layer and the network layer. It played a vital role in network communication, just like the address translator in the network. Its main function was to convert the IP address of the network layer to the data link layer's IP address. This was because in network communication, although the IP address was used to identify the host at the network layer, it was forwarded through the IP address at the data link layer (such as the ether network). The host or the layer 3 network device would maintain an ARP-table to store the IP address and the MAC-address map. The ARP-table entries included dynamic and static ARP-table entries. The working process was as follows: When host A needed to communicate with host B, it first determined the forwarded IP address according to the route table, and then checked the local ARP-buffer. If there was no matching address, it would broadcast an ARP-request frame in the network. All hosts in the same broadcast domain will receive this request. For example, after receiving the request, host C will find that the destination address is not its own, and then it will buffer the address of host A into its own ARP-table, and then discard the packet. After receiving the request, host B will find that the destination address is its own, and then it will buffer the address of host A and give a response. Then it will package its own address in the response ARP-packet and send it to host A. After receiving the response, host A will update its own ARP-buffer. There were two ways to obtain the ARPs: static and dynamic. The static acquisition was equivalent to manually configuration of the address map in the ARP-table. If the physical address changed, it would need to be manually changed, which was more troublesome. The dynamic acquisition was to obtain and update the address map by the host through the protocol, which was relatively convenient. In addition, there was also a free ARP-type message that was used to detect whether there was an IP address conflict. It would send a broadcast message with the same source and destination IP. Under normal circumstances, it was not expected to receive a response. If a response was received, it meant that there was an address conflict. In the Windows system, there were related ARP-commands. For example, ARP-a could check the ARP-buffer table, and ARP-d could delete the ARP-buffer table. However, due to network communication requirements, the buffer table might be regenerated immediately. In November 1982, the Internet Engineering Task Force (IetF) published the Internet Packet Packet Interface Problem (ARPG) 826. It was an indispensable protocol for the Internet Packet Interface Version 4, which was the most widely used version of the Internet protocol.(The Internet Packet Interface Version 6 was still in the early stages of deployment.) The role of the ARP-protocol in the car's ether network was the same as that of the traditional ether network. "Choose" was equally exciting. Everyone was welcome to read it!