network security protocols

this way, even if an illegal user knows the management password, the user cannot intrude into the account because the IP address is unauthorized. In my personal experience, the Intranet can control access permissions by dividing VLAN Virtual LAN, while the Internet needs to use the ACL Access Control List to precisely assign authorization. (5) 　Five sins: Management Culture The security defect of management culture is the most common problem in smal

supplier. It regularly tests various network systems to ensure they work well. When the main service network is paralyzed, the standby facilities can quickly take over the work. 6. Place the device behind the firewall Establish a separate firewall so that communication through VLAN boundaries is limited to available protocols. In case the client is infected, thi

Chapter 6 data communication and computer network (Data communication, data transmission rate, bandwidth, modulation mode, etc. in the channel, mainly about computer networks) 1. What is a computer network? Simply put, a computer network is a network that connects a single machine to a data line through a communication

Article Title: Linux network security policies and protection measures. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 1. Linux-based network security policies and protection measu

Linux-based network security policies and protection measures-Linux Enterprise applications-Linux server application information. For details, refer to the following section. 1. Introduction With the increasing popularity of Internet/Intranet networks, more and more users are using Linux network operating systems as servers. This is because Linux is a free and g

In the previous blog, the small series has used the GRE protocol to achieve the VPN technology, then in this blog, the small part of the use of IPSec protocol to achieve VPN, although the theoretical knowledge is somewhat abstract, but in helping us understand the technology is still very necessary, then now began to theory IPSec (IP Security) is a group of open protocols, the specific communication betwe

Experiment 1 sniffer packet capture Lab Objectives L master Serv-U configuration FTP. L master the basic Telnet usage methods. L through experiments, master the installation and use of common sniffing tools, and understand the data structure of IP, TCP, UDP, and other protocols in the TCP/IP protocol stack, understand the features of FTP, HTTP, and other protocols for plaintext transmission, establish

Today many enterprises have built enterprise network and through a variety of channels to access the Internet, the operation of enterprises more and more integration of human computer network, but the resulting network security issues are increasingly clearly placed in front of the

management and maintenance. At present, a certain scale of networks use dynamic routing protocols, which are commonly used: RIP, VPN, OSPF, IS-IS, and BGP. When a vro with the same routing protocol and region identifier is added to the network, the route information table on the network is learned. However, this method may cause

In traditional IPv4 networks, security has always been a headache. Now the IPv6 protocol network has solved many security problems for us. This is because, in the IPv4 network, the evolved version V6 adopts different transmission structures, so the security mechanism has cha

Layer-3 switches are quite common, So I studied how layer-3 switches can ensure network security. Here I will share with you, hoping to help you. A high-performance switch Cisco Catalyst 4006 with multiple 1-gigabit ports and 10-Gigabit ports is placed in the center of the science and technology building as the core switch of the backbone network. The company's m

user accounts and policies and does not require each access point to have a copy of the Identity Authentication database. This simplifies the management and coordination of account information. (3) RADIUS, as a method for identity authentication for remote access, has been widely recognized and adopted for many years. People know it very well, and it is also a mature technology. (4) The company can select the EAP authentication protocol that best suits its