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What’s The Difference Between 802.11n And 802.11ac?

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This article explains the difference between the currently popular IEEE wireless local-area network (WLAN) standard 802.11n and the forthcoming 802.11ac, which defines a faster version The 802.11 standard was first available in the late 1990s. It was not an immediate success. When the 11b version arrived in 1999, it facilitated the first widespread implementation of WLAN technology. The 802.11b standard is often considered the first generation, 802.11a is the second generation, 802.11g is the third generation, and 802.11n is the fourth generation. When 802.11ac becomes available this year, it will represent the fifth generation. Today, the most widely implemented form is 802.11n, which is used in access points, routers, laptops, smart phones, tablets, and other mobile devices. Devices using 11n are all backward compatible with older 802.11a/g equipment. The 802.11 standard defines both a physical layer (PHY) and media access control (MAC) layer in the networking scheme. While ...
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System & Network Engineer Interview Question and Answer

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1. How Many Layers are There in an OSI Reference Model? Name them. Ans. There are 7 Layers in an OSI (Open Systems Interconnection) Reference Model. They are: (1)   Physical Layer (2)   Data Link Layer (3)   Network Layer (4)   Transport Layer (5)   Session Layer (6)   Presentation Layer (7)   Application Layer 2. How Many Types of Network ? Area Base Network-  LAN, MAN, WAN, CAN, SAN, PAN Architecture Base Network-  Client-Server Network, Peer-to-Peer Network Topology Base Network-  Star, Ring, Bus, Mesh, Tree, Hybrid 3. What is the Difference Between Full Duplex and Half Duplex Devices? Answer: A Full Duplex Device is Preferable, because a Full Duplex Device can Send and Receive Data Packets Simultaneously.  However, with a Half Duplex Device, the Device Must Finish Receiving a Message Before it Can then Send a Message. This can Lead to  Slower Trans...
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Importanat 100 questions and answer for job interview IT Professional

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Q1. What is public IP address? Ans. A public IP address is an address leased from an ISP that allows or enables direct Internet communication. Q2. What's the benefit of subnetting? Ans. Reduce the size of the routing tables. Reduce network traffic. Broadcast traffic can be isolated within a single logical network.Provide a way to secure network traffic by isolating it from the rest of the network. Q3. What are the differences between static IP addressing and dynamic IP addressing? Ans. With static IP addressing, a computer (or other device) is configured to always use the same IP address. With dynamic addressing, the IP address can change periodically and is managed by a centralized network service Q4. What is APIPA? Ans. Automatic private IP addressing (APIPA) is a feature mainly found in Microsoft operating systems. APIPA enables clients to still communicate with other computers on the same network segment until an IP address can be obtained from a DHCP server, allowing t...
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