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NAS Or  Network Attached Storage NAS is a brief form of Network Attached Storage , it is a network device basically, which is used to store and backup your data in a network. It is a device that works on RAID technology and backs up your data without your day to day intervention. NAS is a good option for your home and small businesses or at the places where you don’t have lots of data storage and backup requirements. NAS is just a network device with multiple hard disk support, you can insert multiple hard disks to increase your storage and backup capacity, thereafter you can access and share your data from anywhere within a network, except that you can also create cloud storage to access it publicly when you are not at your home. NAS basically does centralize file management in a very efficient manner and provides an additional data security layer to your files and data by using some encryption techniques. It is not affected by viruses because it is just external storage apart

HS2 stands for Hotspot 2.0 which is an advanced version of Hotspot, mainly designed to give more control over peers. Security of this version enhanced a lot as compare to previous version. It is also known as Wi-Fi CERTIFIED PASSPOINT. It works on 802.11 u standard protocol and WPA2 encryption standard, which is a strong encryption standard. It has more bandwidth as compare to the previous version, which offers more Internet speed to download and upload or to surf internet for other purposes. This is mainly designed to connect with hotspots at airport, railway or metro stations, Coffee Shops, libraries and public areas. It ensures that you will surf internet securely at these places without worrying about malicious users. It does not require additional sign up information and authentication process. As a Hotspot 2.0 device comes under the range it automatically connects to the network without sing up and authentication. It is discovered by WI-FI alliances, to ease WI-FI services

Subnetting is a technique used in order to divide a network into subnetworks, so that all of the networks could mange easily and if a network fails then it will not affect on the other networks. When we do subnetting a concept of subnet mask is used in order to divide a network into subnetworks. So we will learn that how do we create subnetworks by using subnet mask. For instance if we use 192.77.50.0 which is a class C IP address so here we need class C subnet mask 255.255.255.0 . So it depends on the numbers of the subnetworks we have to create means if we have to create 2 subnetworks then we will borrow a bit from third octate of the subnet mask. We can easily calculate no. of bits to create desired no. of networks with the help of 2 n , where n is no of bits. So we will borrow 1 bit because 2 1 = 2. Believe me it is very easy. Let me show you how do we do that. IP address:        192.77.50.0 Subnet mask:        255.255.255.0 No. of networks:      2 Now write the subne