This is the first series of blockchain tutorials which covers all the aspects of this technology. We will understand blockchain and its history, how does it work, and its basics such as the types of blockchain, block chain nodes, and distributed ledger. We will also look at how is it c...
Data Link Layer (Layer 2) - RAPA, PPP, Frame Relay, ATM, Fiber Cable, etc. Physical Layer (Layer 1) - RS232, 100BaseTX, ISDN, 11. Each layer is stacked on top of the other and information flows between each layer during network activity. Even with just a surface-level understanding ...
When setting up a proxy, you’ll define what types of data to relay (and block) between the two connected devices. Traditional firewalls work at the TCP level, while proxy firewalls work at the application level, such as on HTTP. We use HTTP to browse the internet, and this type of ...
Therefore, many Internet Service Providers block port 25 for security reasons. In such a case, you will see an error like “Could not connect to SMTP host localhost port 25”. Even so, 25 can work withTLS(Transport Layer Security) if an MTA server supports it. If it doesn’t, the rec...
How does an SMTP relay server work? What is an SMTP mail relay? What is a public SMTP relay server? What is an authenticated SMTP server? What is the SMTP server address? Why are SMTP relay services important? How to troubleshoot SMTP relay service issues Dealing with IP blocklisting ...
Closing the window completely erases your browsing history. You can block third-party cookies this way, too; the page you visit won’t give you ads later if you’re in Incognito mode. Some version of Incognito Mode is available on all major browsers, including Google Chrome, Mozilla Firefox...
First, let’s start with a basic definition: what is an email blocklist? An email blocklist is a record that contains IP addresses or domains flagged by spam filters. Servers use this information to determine which addresses to block—either by diverting directly to a spam folder or by disa...
A solid-state relay is a pivotal component in modern electronic systems, offering an efficient, reliable method for controlling electrical power. These solid-state devices operate on the principle of semiconductor switching, providing an electronic alternative to traditional mechanical relays. This article...
If a site is protected by multi-factor authentication, the attacker could instead capture your session token. With your session token, they would block your logout action so they can continue the current session when you close your browser. This example highlights how digital communications can ...
Three Phase Solid State Relay with ZVS Project Block Diagram by Edgefxkits.com The above figure shows the block diagram of practical three phase solid state relay with ZVS which consists of thepower supply block, microcontroller block, TRIAC set, and loads. The zero crossing feature of an Opto...