what is packet tracer

When surfing the internet, we often see the word "Port" and often use the port number. For example, if "21" is added after the FTP address, "21" indicates the port number. So what does port mean? How can I view the port number? Does a port become the door to malicious cyberattacks ?, How should we face all kinds of ports? The following content will be introduced for your reference. Port Introduction: This a

What is the function and working principle of fiber Switch fiber switch: Fiber Optic switch is a high-speed network transmission relay device, which uses fiber optic cable as transmission medium compared with ordinary switch. The advantages of optical fiber transmission are fast speed and strong anti-interference ability. With the increasing of enterprise networ

In Windows 7 above system, when setting the local IP address often see colleague contains IPV4 agreement item and IPV6 Agreement item, Inquire IPV6 and IPv4 difference, the following small series for everybody introduced under IPV6 and IPv4 what difference. The protocol family used in the current global Internet is the TCP/IP protocol family. IP is the protocol

After the vswitch system is restarted successfully and the VRP platform software is updated, the switch system is reconfigured according to the previous configuration, and the switch's working status returns to normal immediately, so what is the reason? As a core network ter

(' uname=sally '); Request principal (Entity content)　　　　　　　　Note : as required by the HTTP protocol, if a POST request is sent, the content-type message header should be included in the request packet, and the Ajax object will not add the message header by default. So we need to call the setRequestHeader method to add, but if it is a GET request, you don't have

Often see network friends in the difference between the switch and router, in fact, if you have used both switch and router friends should know, for everyone, switch and router use the biggest difference is that the router can realize dial-up internet access, and then shared to multiple computers at the same time the Internet, But the switch does not have the dial function, but the function of the switch is

buildings. Therefore, setting up a wireless LAN becomes the best solution ｡ What is the need for a wireless local area network? A wireless local area network is not used to replace a wired local area network, but to make up for the shortcomings of a wired Local Area Network to extend the network. The following situations may require a Wireless Local Area Network

At present, can reach the wall function of more than VPN, such as the more popular in recent years, the SS, but a lot of friends completely confused SS, SSH and SSL What is the difference between these connections or the protocol and VPN in the end which good? Here are some simple descriptions. VPN here is not much to do introduction,

subtitle file together, in the MKV package inside the subtitle and video is separate, independent, like RAR package inside 2 files. You can also choose whether to open subtitles when playing. It's doable when you want to unload the subtitles or rewind the video without subtitles. MKV is a reversible package. inline, subtitles and video fit, is equal to the orig

DNS (Domain Name System) is a distributed database that maps domain names and IP addresses on the Internet, allowing users to access the Internet more conveniently, instead of remembering the number of IP address strings that can be directly read by machines. The process of obtaining the IP address corresponding to the host name through the host name is called domain name resolution (or host name resolution

What is the difference between initial catalog and database?Initial Catalog:DataBase:There is no difference between the two, but the names are different, just like the real names of humans and old names .. Can call you. **************************************** **** Integrated Security = SSPI indicates that the current WINDOWS system user logs on to the SQL server

What is a compressed file? Concept: Compressed software compression files are called compressed files. The use of more compression software is winrar, how to compress the file? Please read the following description: 1: First of all to install a good compression software, such as WinRAR compression software. Select the file to compress, right-click the file in