Techknow+

Machine learning is a subfield of artificial intelligence (AI) concerned with algorithms that allow computers to learn. What this means, in most cases, is that an algorithm is given a set of data and infers information about the properties of the data—and that information allows it to make predictions about other data that it might see in the future. This is possible because almost all nonrandom data contains patterns, and these patterns allow the machine to generalize. In order to generalize, it trains a model with what it determines are the important aspects of the data. To understand how models come to be, consider a simple example in the otherwise complex field of email filtering. Suppose you receive a lot of spam that contains the words “online pharmacy.” As a human being, you are well equipped to recognize patterns, and you quickly determine that any message with the words “online pharmacy” is spam and should be moved directly to the trash. This is a generalization—you...

The only real reason this is ever a confusing topic is because instructors spend a lot of time drilling into student’s heads that the public key is for encryption and that the private key is for decryption. In general, this is a true statement (and I’m willing to bet you’ll see it on your exam that way). However, remember that the keys are created in pairs—what one key does, the other undoes. If you encrypt something with the public key, the private key is the only one that can decrypt it. But that works in reverse, too—if you encrypt something with your private key, your public key is the only thing that can decrypt it. Keeping this in mind, the digital signature is an easy thing to understand. A digital signature is nothing more than an algorithmic output that is designed to ensure the authenticity (and integrity) of the sender—basically a hash algorithm. The way it works is simple: 1. Bob creates a text message to send to Joe. 2. Bob runs his message through a hash and gener...

I know this may seem out of order, since I’ve mentioned the word “certificate” multiple times already, but it’s nearly impossible to discuss PKI without mentioning certificates, and vice versa. As you can probably tell so far, a digital certificate isn’t really involved with  encryption at all. It is, instead, a measure by which entities on a network can provide identification. A digital certificate is an electronic file that is used to verify a user’s identity, providing non-repudiation throughout the system.The certificate itself, in the PKI framework, follows a standard used worldwide. The X.509 standard, a part of a much bigger series of standards set up for directory services and such, defines what should and should not be in a digital certificate. Because of the standard, any system complying with X.509 can exchange and use digital certificates to establish authenticity. The contents of a digital certificate are listed-: ...

 ARTIFICIAL INTELLIGENCE :- We call ourselves Homo sapiens—man the wise—because our intelligence is so important to us. For thousands of years, we have tried to understand how we think; that is, how a mere handful of matter can perceive, understand, predict, and manipulate a world far larger and more complicated than itself. The field of artificial intelligence , or AI, goes further still: it attempts not just to understand but also to build intelligent entities. AI is one of the newest fields in science and engineering. Work started in earnest soon after World War II, and the name itself was coined in 1956. Along with molecular biology, AI is regularly cited as the “field I would most like to be in” by scientists in other disciplines. A student in physics might reasonably feel that all the good ideas have already been taken by Galileo, Newton, Einstein, and the rest. AI, on the other hand, still has openings for several full-time Einsteins and Edisons . AI currently encom...

ARP is a protocol used by the Internet Protocol (IP) to map IP network address (IPv4 address) into link layer address. The protocol operates at the network layer as a part of the interface between the OSI network and OSI link layer. Reverse ARP is also available and is represented as RARP, is used to discover its IP address by a host. In this case, the host broadcasts its physical address and an RARP server replies with the host's IP address. ARP is one which lies between layer 2 and 3 of the OSI model, though it is not included in this model. (i) Mechanism If a packet is intended for a host machine on a specific LAN reaches a gateway. The ARP program finds a physical host or MAC address that matches the IP address as per the gateway request and looks forward to ARP cache. If it finds the address, the packet is converted to the right packet length and format, then sent to the machine. If an entry is not found for the IP address, ARP extends a request packet to all the mach...

OSPF (open shortest path first ) Protocol: Routers connect networks using the Internet Protocol (IP), and OSPF (Open Shortest Path First) is a  router   protocol  used to find the best path for packets as they pass through a set of connected networks. OSPF is designated by the Internet Engineering Task Force ( IETF ) as one of several Interior Gateway Protocols ( IGP s) -- that is, protocols aimed at traffic moving around within a larger  autonomous system  network like a single enterprise's network, which may in turn be made up of many separate local area networks linked through routers. The OSPF routing protocol has largely replaced the older Routing Information Protocol (RIP) in corporate networks. Using OSPF, a router that learns of a change to a routing table (when it is reconfigured by network staff, for example) or detects a change in the network immediately multi-casts the information to all other OSPF hosts in the network so they will all...

We have to identify the confidential information that needs to be protected on the network. The necessary security policies and guidelines should be defined for the organization. There should be at least one outcomes and accomplishments for each security objectives in order to ensure we have to set the proper security policies within the organization.  The required Security technologies need to be defined in protecting the critical infrastructure of the network. Critical infrastructure refers to critical resources like data, servers, hosts, clients that need to be protected on the network There are various security risks and challenges that needs to be addressed on the network  There are always consequences that organization have to face of not implementing proper security infrastructure.  Companies have to support the development of various innovative solutions for securing future data on the network. Companies have to build some solution in order to avoid vari...