what is packet tracer

What is icmp redirection ICMP redirection is one of the ICMP control packets. Under certain circumstances, when a router detects that a machine uses a non-optimized route, it will send an ICMP redirection packet to the host and request the host to change the route. The router also forwards the initial datagram to its d

socket and client communication. (Note: The server-side listening port is unchanged, but the socket connection can be generated and one thread corresponds to a socket.) at the same time, a port can only establish one connection. NBSP Listening on a port, but while listening to the port, the generation of a waiting queue, each from the client's connection will be sent to the waiting queue, the server uses a certain algorithm to select the correspon

port 80. 2. Many firewalls only allow data packets on specific ports to pass through. 3. After a service program accesses a connection request on a port of listen, a new socket is generated to process the request. As a result, a problem that puzzled me for a long time emerged. If a socket is created and bound to port 80, does it occupy port 80? If this is the c

10 minutes and then makes a packet, called a block, covers a timestamp, and then adds it to the block chain. What is the block? A block is a container data structure that aggregates transaction information (that is, an average of 10 minutes of bitcoin transactions issued by

process is an exchange established manually. Of course, we have already popularized programmable switches, and the exchange process is automatically completed. In computer network systems, the concept of exchange is an improvement of the shared working mode. The HUB we have previously introduced is A shared device. Th

What is DHCP? Dynamic Host Configuration Protocol (DHCP) provides a mechanism called plug-and-play connection. This mechanism allows a computer to join a new network and obtain IP addresses without manual intervention. Of course, the DHCP service is not only reflected in the automatic IP Address Allocation Process for the DHCP client, but also in the IP address r

The following excerpt from Go Web programming is easy to understand.When we browse the Web, we open the browser, enter the URL and press ENTER, then we will show you what you want to see. What is hidden behind this seemingly simple user behavior?For the normal online process, the system

Detailed description of QoS traffic control management!More and more routers use QoS. As a network administrator. QoS is becoming increasingly popular in our ears. What is QoS traffic control? Let's take a look at it today.To put it simply. QoS is a technology used to solve network latency and congestion problems! Take

troubleshooting backup slowness and application latency. in this articleArticleWe will clearly define the TCP window to see how it affects performance and how to monitor it using Wireshark. What is a TCP window? When discussing TCP window, we almost always refer to TCP receive window. to put it simply, the TCP receive window is a buffer at both ends of th

This article brings you to the content is about JS in the definition of closure is what? JS closure of the application scenario, there is a certain reference value, there is a need for friends to refer to, I hope you have some help. Wha