What is Network Access Control (NAC)? When a device tries to access a network, the device must comply with the security policy of the organization. For example, a device with outdated anti-malware software should not be able to access the network. If such a device...
What is a Captive Portal? Sometimes when we try to access public Wi-Fi in a restaurant, mall, or hotel, we are redirected to a web page that requests login credentials or requests us to accept Terms and Conditions. This type of web page is called a captive portal. A...
A BPDU or Bridge Protocol Data Unit is a frame that is exchanged between switches in an extended LAN that uses Spanning Tree Protocol (STP) topology. These BPDU frames are exchanged to prevent layer 2 loops and broadcast storms. And, BPDU guard is a security feature...
What is a brute-force attack? A brute-force attack is an attack in which an attacker uses a trial-and-error method to submit multiple passwords, passphrases, etc. in the hope that the attacker will be finally able to guess the correct password or passphrase. Sometimes...
What is zero trust security? Traditional network security is based on trust and verify principle. If a user or device is inside the network perimeter, it is trusted. But, this approach may prove to be insecure at times. For example, if an attacker manages to gain...
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