Technology Ideas

 Running into an error with the Domain Name System — simply called a DNS error — means you won't be able to get access to the internet, which is frustrating if it happens regularly. Learning the most common causes of DNS issues and the best methods for fixing them can help you get back online with minimal effort. Essentially the DNS translates the domain names we use to access websites into IP addresses, which is what your computer actually uses to access the website. In most cases, a DNS problem is easy to fix Network Problems In many cases, an error attributed to DNS could be a simple connection problem (especially if you're connecting wirelessly using a laptop) that doesn't really relate to the DNS at all. Before blaming DNS errors, go to your "Network and Sharing Center" and run the troubleshooter. This will identify and fix many common connectivity issues and can help you narrow down the cause of the issue. Duplicate IP Addresses When two devices attempt to s...

  To design and build a two-tier campus network architecture is everything like a three-tier hierarchical design and maximizes performance, network availability, and the ability to scale the network design. It is common to campus networks where the aggregation or distribution layer is merged with the core layer to create a unique and fully functional network for a good sized campus. However, many small enterprise networks do not grow significantly larger over time. Therefore, a two-tier hierarchical design where the core and distribution layers are collapsed into one layer is often more practical. A “collapsed core” is when the distribution layer and core layer functions are implemented by a single device. The primary motivation for the collapsed core design is reducing network cost, while maintaining most of the benefits of the three-tier hierarchical model.. To design and build a two-tier campus network architecture, a number of considerations must be taken into account. A key he...

  A LAN (local area network) interconnects several computers using Ethernet technology. As technology advances, networking capabilities have begun shipping as a standard feature on most motherboards. Onboard LAN is a specialized chipset on the motherboard designed to handle networking responsibilities for the computer, such as home networking and Internet connectivity Local Area Networking Local area networks connect several computers within a limited physical proximity via Ethernet cables or wireless Ethernet, such as in homes, schools or businesses. In early computers, this capability was not a standard feature and required the installation of a network interface card (NIC). NIC installation was necessary until LANs became more common, requiring more efficient and less expensive networking capabilities. Onboard LAN controllers support numerous built-in hardware and software enhancements for networking, such as power management and input/output (I/O) scalability. Onboard LAN As tr...

  Before you learn how to use L0phtCrack with Win2K, it helps to understand how password cracking works in NT, and then extend that process to Win2K. (If you are already an expert NT password cracker, feel free to skip ahead.) NT stores a hash, but not the clear text password, of each user's password in the domain controller’s SAM database. If you're not familiar with the SAM, it is a Registry hive file found in %systemroot%\system32\config. Using your administrator authority, L0phtCrack pulls the hashes from the SAM and cracks the hashes by exploiting weaknesses in NT’s hashing algorithm. To crack a password hash, L0phtCrack first performs a dictionary attack by iterating through a list of common words. L0phtCrack hashes each word in the list and compares that hash to the hash from the SAM. If the hashes match, L0phtCrack has the password. Once L0phtCrack exhausts the dictionary, it iterates through the word list again using a hybrid attack that adds combinations of a few char...

  In many cases, once a Wireless router has been installed, we find a place in our home for it and forget about it. As long as all our devices are set up and connected via the Wi-fi network, that’s all that matters, right? Wrong! Probably many of you don’t realize, but the Internet router is one of the most important devices in our home. It’s the gateway to our Internet access and also prone to exploits by cybercriminals who can sneak into our devices and get access to our system. Let’s not forget that we live in the age of data breaches, ransomware attacks, and many other online threats. Thus, you should be worried about the security of your home network and take all the needed security measures to increase Wifi security. The only measure most people use to protect their home network is to set up a password and prevent neighbors and other people from taking control of your data. But we have to be more serious about security and do more than just setting a simple password. A seriou...

  To design and build a two-tier campus network architecture is everything like a three-tier hierarchical design and maximizes performance, network availability, and the ability to scale the network design. It is common to campus networks where the aggregation or distribution layer is merged with the core layer to create a unique and fully functional network for a good sized campus. However, many small enterprise networks do not grow significantly larger over time. Therefore, a two-tier hierarchical design where the core and distribution layers are collapsed into one layer is often more practical. A “collapsed core” is when the distribution layer and core layer functions are implemented by a single device. The primary motivation for the collapsed core design is reducing network cost, while maintaining most of the benefits of the three-tier hierarchical model.. To design and build a two-tier campus network architecture, a number of considerations must be taken into account. A key he...

  The art of networking is no easy feat. And as networking jobs encompass more than just networking, it’s not going to get any easier. It’s going to be about embracing advancements in data gathering, automation, and programming languages. In fact, it’s going to look a lot like DevOps. Here are five skills you can develop to meet the changing tides of the networking industry. Learn a Language It never hurts to learn a new programming language. To keep up with automation, network engineers need methods and tools to programmatically control equipment. This is where languages can come into play. If your organization is using software-defined networking (SDN), keep in mind the networks offer interfaces to scan and monitor automatically. Fully understanding the language these programs are speaking gives you an upper hand. Automation tools like Chef can handle some of the grunt work, freeing up time for your networking pros. But admins should still understand the process of writing their ...

  A LAN (local area network) interconnects several computers using Ethernet technology. As technology advances, networking capabilities have begun shipping as a standard feature on most motherboards. Onboard LAN is a specialized chipset on the motherboard designed to handle networking responsibilities for the computer, such as home networking and Internet connectivity Local Area Networking Local area networks connect several computers within a limited physical proximity via Ethernet cables or wireless Ethernet, such as in homes, schools or businesses. In early computers, this capability was not a standard feature and required the installation of a network interface card (NIC). NIC installation was necessary until LANs became more common, requiring more efficient and less expensive networking capabilities. Onboard LAN controllers support numerous built-in hardware and software enhancements for networking, such as power management and input/output (I/O) scalability. Onboard LAN As tr...

  To design and build a two-tier campus network architecture is everything like a three-tier hierarchical design and maximizes performance, network availability, and the ability to scale the network design. It is common to campus networks where the aggregation or distribution layer is merged with the core layer to create a unique and fully functional network for a good sized campus. However, many small enterprise networks do not grow significantly larger over time. Therefore, a two-tier hierarchical design where the core and distribution layers are collapsed into one layer is often more practical. A “collapsed core” is when the distribution layer and core layer functions are implemented by a single device. The primary motivation for the collapsed core design is reducing network cost, while maintaining most of the benefits of the three-tier hierarchical model.. To design and build a two-tier campus network architecture, a number of considerations must be taken into account. A key he...

  Networks are networks. Despite best efforts to keep things smooth all the time every day, things happen. Here’s a look at some common network issues, some tips for quickly resolving them, and even better, how to prevent them from occurring again. 1. Duplicate IP Addresses When two devices attempt to share a single IP, you see the dreaded “Address Already in Use” error — with no ability to access the network. The Quick Fix: The blame for this often rests with your router’s default DHCP configuration. DHCP is probably trying to assign your new device an address at the beginning of your subnet, and another device may already occupy these low-numbered addresses with static IPs. If you’ve just introduced a new device or server to your network, it may have its own DHCP server. Simply disable the DHCP server on that device to restore sanity to your network. The Preventive Measure: You can take one simple step to avoid IP conflicts by modifying your router’s configuration to begin assign...

  Each type of information system platform (e.g., workstations, servers, storage area network, switches, firewalls, routers, virtualization, or cloud computing) that makes up the information technology infrastructure has its own unique vulnerabilities. Security architecture is fundamental to enforcing security policies that can be applied at different layers for each type of system platform. This architecture is based on how the enterprise will handle each of the following: Allowable and disallowable services and protocols Vulnerability scanning Patch management Firmware or software upgrades A security professional then sets standards for safeguards and controls for each platform. When designing the security architecture, a security architect or engineer should take the stance of an attacker to eliminate major vulnerabilities or reduce risks at each of the various platforms. This would entail a network engineer or security professional to use the same methods and tools that a hacke...

  Windows 10 Creators Update introduced a number of changes to the user interface, so disabling Smart Screen can be a bit confusing. In this article, we'll see how to properly disable SmartScreen in it. The SmartScreen filter is a technology which was initially designed for Internet Explorer to protect users from malicious websites and web applications. It was integrated with IE8 and IE9 (as the successor to IE7's Phishing filter). Starting with Windows 8, Microsoft implemented Internet Explorer's SmartScreen feature directly into the operating system so files are screened for being potentially harmful. SmartScreen is also integrated for Windows Store apps. If enabled, the Windows SmartScreen filter sends information about every application you download and run to Microsoft’s servers, where that information will be analyzed and compared with their malicious apps database. If Windows gets a negative feedback about the app from the server, it will prevent you from running the...

  Networks are networks. Despite best efforts to keep things smooth all the time every day, things happen. Here’s a look at some common network issues, some tips for quickly resolving them, and even better, how to prevent them from occurring again. 1. Duplicate IP Addresses When two devices attempt to share a single IP, you see the dreaded “Address Already in Use” error — with no ability to access the network. The Quick Fix: The blame for this often rests with your router’s default DHCP configuration. DHCP is probably trying to assign your new device an address at the beginning of your subnet, and another device may already occupy these low-numbered addresses with static IPs. If you’ve just introduced a new device or server to your network, it may have its own DHCP server. Simply disable the DHCP server on that device to restore sanity to your network. The Preventive Measure: You can take one simple step to avoid IP conflicts by modifying your router’s configuration to begin assign...