Guide to the construction of network security testing laboratory - Chapter 1, section 1.5 key terms

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This excerpt is from the asynchronous community 《 Network security test Laboratory construction guide 》 No 1 Chapter 1.5 Section key terms , author 【 beautiful 】Michael Gregg（ Michael Greg ）

1.5　 Key terms chmod—— Used to change file permissions Linux Operating system commands . etc/shadow file ——Linux The possible storage location of password files in the system , Only root User access . A firewall —— A software or hardware security system used to manage and control network connectivity and network services . Firewall is the throat of traffic entering and leaving the network , It can also block unrestricted access . Firewalls can be connected firewalls or connectionless firewalls . A hub —— It is a device that can connect computers and other devices in Ethernet LAN （ For example, network attached memory ） Devices connected by network cables . ISO Image file —— Can be stored as a separate file CD or DVD Image file of CD , At the same time, it can represent the complete structure of the CD . Unlocking Technology —— Technology that does not rely on keys to unlock . Enforce access control —— Is a way to control access . Access rights are determined by the sensitivity of the information contained by the interviewee （ Use labels to indicate ） And the authorization assigned to visitors to access this information （ Such as the “ clear ” Authorization of ） To decide . MD5sum command ——MD5 It is a method of generating 128 Bit information digest to check the data integrity of the encryption algorithm ,MD5sum yes Linux System execution MD5 Command of Algorithm . Network Attached Storage —— It is a storage device for files and data , And support LAN direct access . Phone theft —— Used to express telecommunication network or telecommunication 、 Illegal operation caused by voice network cracking . Router —— The device determines the next network node that a packet will pass through in the process of forwarding to the final destination . The router creates and maintains a routing table , And use the information in the table to determine the best path of each packet . The routing process takes place in OSI The third layer of the seven layer network model （ The network layer ）. Salt value —— Add a layer of randomness to the stored password by changing the password hash value . Switch —— A device used to separate LANs and provide packet filtering . A LAN switch has multiple ports , Each port can support an entire Ethernet or token ring LAN . virtualization —— Virtualization technology is a software implementation method for hardware . It allows users to run multiple operating systems on the same physical host without affecting each other . WiFi The detector —— A device used to detect wireless signals . Wireless access point —— Devices used to bridge wired and Wireless Networks . Wireless access points act as central nodes for wireless device users connected to wired networks .

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