Tech Savvy

Troubleshooting is the process of identifying, analyzing, and solving problems.  Debugging is the process of identifying, analyzing, and removing bugs in a system. We sometimes use troubleshooting and debugging interchangeably.  But generally, we say troubleshooting when we're fixing problems in the system running the application, and debugging when we're fixing the bugs in the actual code of the application. Debuggers let us follow the code line by line, inspect changes in variable assignments, interrupt the program when a specific condition is met, and more. System calls are the calls that the programs running on our computer make to the running kernel.   A reproduction case is a way to verify if the problem is present or not. Where to check for log file in OS? On Linux , you'd read system logs like /var/log/syslog and user-specific logs like the .xsession-errors file located in the user's home directory. On MacOs , on top of the system logs, you'd go through...

Network hardening is the process of securing a network by reducing its potential vulnerabilities through configuration changes and taking specific steps.   Implicit deny is a network security concept where anything not explicitly permitted or allowed should be denied. Analyzing logs is the practice of collecting logs from different networks and sometimes client devices on your network, then performing an automated analysis on them. Correlation analysis is the process of taking log data from different systems and matching events across the systems. Flood guards provide protection against Dos or denial of service attacks. EAP-TLS is an authentication type supported by EAP that uses TLS to provide mutual authentication of both the client and the authenticating server.   if you really want to lock down your network, you can implement 802.1x . DHCP Snooping Attack Why WEP Encryption fall apart? A general concept in security and encryption is to never send the plain ...

Identification is the idea of describing an entity uniquely. Biometric authentication is the process of using unique physiological characteristics of an individual to identify them. C.R.L(Certificate revocation list) :This is a signed list published by the CA which defines certificates that have been explicitly revoked. Lightweight Directory Access Protocol(LDAP): LDAP is an open industry-standard protocol for accessing and maintaining directory services. Authentication is related to verifying the identity a user, authorization pertains to describing what the user account has access to or doesn't have access to. An access control list or ACL , is a way of defining permissions or authorizations for objects.  RADIUS or Remote Authentication Dial-In User Service , is a protocol that provides AAA services for users on a network.It's a very common protocol used to manage access to internal networks, WiFi networks, email services and VPN services. when a client wants to access a r...