Port 0: invalid port, usually used to analyze operating system port 1: transmission control protocol port service multiplex switch selector 2 port: management utility 3 port: compression process 5 port: remote job login 7 port: echo 9 port: discard 11 port: online user 13 port: time 17 port
Experimental purpose: through DHCP relay, a DHCP server can automatically assign IP addresses across network segments, which avoids the need of a DHCP server for each network segment and greatly reduces the use of resources. The experimental topology diagram is as follows: experimental steps: first put 172.21
Disk array technology can be divided into several levels of 0-5 RAID technology in detail, and a new level called RAID Level 10, 30, 50 has been developed. RAID is a cheap redundant disk array (Redundant Array o
Bidding instances are idle computing capacity in the cloud, and it is one of the billing methods for cloud providers-the other two are on-demand instances and reserved instances (prepaid instances). As far as the server itself is concerned, there is no difference between the three, the difference lies in the business model. On-demand instances are charged according to the duration of use, and users only
Kill Matt server security software specializes in maintaining server security. Focus on server security, let the server security become simple, let the webmaster better manage the server. Basic functions: server system users, file monitoring, malicious file deletion, website anti-injection tampering. Enhanced functions: real-time monitoring of killing Matt website,
Xiaobai must see: ultra-simple Trunk small experiment, a look to understand one. Experimental environment: GNS3, router c2691 II. Figure 3 of the experimental topology. The first step of the experiment is to configure vlan and interface. First set up the vlan as shown in the picture. Then assign the interface of sw1 to the corresponding vl
The official version of Exchange 2019 has been out for some time. You should have some basic understanding of some of its new features. I will share them with you one by one later. What I want to share with you today is for exchange 2019 security, in security.
Nmap uses Nmap as a host scanning tool, his graphical interface is Zenmap, and the distributed framework is Dnamp. Nmap can accomplish the following tasks: host probe port scan version detection system detection support probe script writing Nmap in practical applications are as follows: through
1. Check to see if vsftpd [root @ htuidc ~] # rpm-q vsftpdpackage vsftpd is not installed indicates that vsftpd-2.2.2-24.e is not installed
When the Redis cluster cluster Redis-Cluster is designed, it takes into account the decentralization, de-middleware, each node in the cluster is equal and peer-to-peer, and each node saves its own data and the state of the whole cluster. Every node
Due to the update of windows10, recently many friends will encounter the error report of mstsc remote connection desktop: there are the following solutions: 1. Windows10 Enterprise Edition solution: press "win+R", run gpedit.msc, and find "computer configuration"
In this article, we will learn about system administration using linux's renice command. There is a certain reference value, friends in need can refer to, hope to help you. The renice command modifies the scheduling priority of a running process. The command is preset to program
This article mainly introduces the use of linux's quotastats command to display the current disk quota running status information of the Linux system, which has a certain reference value, and friends who need it can refer to it. Let's take a look at it with me. The quotastats command is used to display
This article mainly introduces the use of linux mount.nfs4 command to mount the NFSv4 file system, has a certain reference value, friends in need can refer to. Let's take a look at it with me. NFS, short for Network File System
This article mainly introduces the use of linux's mdu command to display the disk space occupied by the MS-DOS directory, which can be used for reference by friends who need it. Let's take a look at it with me. The mdu command is used to display the disk space occupied by the MS-DOS directory, m
Today, the editor shares with you how to use linux's quotaon command to activate the disk quota function of the specified file system in the Linux kernel. I believe many people do not know much about it. In order to make you understand better, I have summarized the following contents for you. Let's read on. There must be something.
This article mainly introduces the use of linux's rtacct command to monitor network statistics, which can be used for reference by friends who need it. Let's take a look at it with me. Use the rtacct command to monitor kernel snmp counters and network interface statistics, which
Today, the editor shares with you the use of linux's slocate command to find files or directories. I believe many people don't know much about it. In order to make you understand better, I summed up the following contents and looked down together. I'm sure you'll get something. Slocate itself has a
Today, what the editor shares with you is the use of linux's vgextend command to expand the volume group. I believe many people do not know much about it. In order to make you understand better, I have summarized the following contents for you. Let's look down together. I'm sure you'll get something. The vgextend command is used for dynamic expansion
This article mainly introduces the use of linux's mdel command to delete files in MSDOS format, which can be used for reference by friends who need it. Let's take a look at it with me. Mdel is a mtools tool command that simulates the deltr of MS-DOS
