Current Affairs 2020 UPGK/UP GK SPECIAL/UP GK PREPARATION/UPGK CLASSES D...

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लाई-फाई क्या हैं?, और कैसे काम करता है ?

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क्‍या है लाई-फाई - What is Li-Fi in Hindi   Posted by -AKHILESH KUMAR-    लाई-फाई  ( Li-Fi )  का पूरा अर्थ है लाइट फिडेलिटी ( light fidelity),है   इसका आविष्‍कार (Invention) एडिनबर्ग विश्वविद्यालय के एक प्रोफ़ेसर/इंजीनियर  हेराल्ड हास ( Harald Haas )  ने सन् 2011 में किया था। यह भी  वाई-फाई ( Wi-Fi) की तरह ही एक वायरलैस नेटवर्किंग सुविधा है।  वाई-फाई ( Wi-Fi)  रेडियो फ्रीक्वेंसी (Radio Frequency) पर आधारित है, इसके विपरीत लाई-फाई ( Li-Fi ) असल में प्रकाश पर आधारित है, जो वाई-फाई से की तुलना में 100 गुना तेजी से डाटा का आदान-प्रदान करने में सक्षम है। लाई-फाई ( Li-Fi ) तकनीक में डाटा का आदान-प्रदान करने के लिये LED बल्‍ब का प्रयेाग किया जाता है यानि इस तकनीक में डेटा विजिबल लाइट कम्युनिकेशन (वीएलसी) द्वारा ट्रांसफर होता है। जिस प्रकार आपका टीवी रिमोट काम करता है कुछ-कुछ उसी तरह।  लाई-फाई तकनीक का एक बड़ा फायदा यह है कि यह वाई-फाई की तरह दूसरे रेडियो सिग्नल के लिए अवर...
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What is DHCP and How does it work and benefits

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       What is DHCP and how does it work   DHCP (Dynamic Host Configuration Protocol) is a protocol that is commonly used in networks for dynamic IP addressing configuration. Every user’s device needs at least IP address to join the network and connect to services. When computer first connects to local network with cable or WiFi SSID, first thing is to look for IP address, netmask, default gateway and DNS servers. Host connecting to network (cable or wireless) sends DHCP discover message to all hosts in Layer 2 segment (destination address is FF:FF:FF:FF:FF:FF). Frame with this  DISCOVER  message hits the DHCP Server.      2. After the DHCP Server receives discover message it suggests the IP addressing offering to the client host by unicast. This  OFFER  message contains: proposed IP address for client (here 192.168.1.10) subnet mask to identify the subnet space (here 255.255.255.0) IP of default gateway for subn...
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What is IP Address and its UsesDefnition

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Internet Protocol Address (IP Address)    Definition - What does  Internet Protocol Address (IP Address)  mean? An Internet Protocol address (IP address) is a logical numeric address that is assigned to every single computer, printer, switch, router or any other device that is part of a TCP/IP-based network.                              The IP address is the core component on which the networking architecture is built; no network exists without it. An IP address is a logicaladdress that is used to uniquely identify every node in                   the network. Because IP addresses are logical, they can change. They are similar to addresses in a town or city because the IP address gives the network node an address so that it can communicate with other nodes or networks, just like mail is sent to friends and relatives.  ...
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