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ARP (Address Resolution Protocol)

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  ARP     Table of Contents:- 1.     Introduction. 2.     Simplified Explanation of Packet Flow at L3 and L2. 3.     Why do we need ARP. 4.     What is ARP and How does It work. 5.     ARP Header. 6.     Flow of ARP. 7.     The FOUR cases of ARP. 8.     Questions asked from ARP in the Network Engineer L1 Interview. Ÿ Having read in the OSI Model you must be knowing that Layer 3 that is your network layer is responsible for end-to-end delivery of the packet whereas L2 is responsible for the next hop delivery of the packet. Ÿ Although ARP is a Layer 2 protocol but I consider it to be working somewhere in between L3 and L2. Ÿ Before understanding ARP let me explain you an overview of the packet flow according to L3 and L2.             ** Considering 1,2,11,12,21,22 as the IP’s and A,...
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TYPES OF ARP

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  Types of ARP     Table of Contents:- 1.    Types of ARP. 1.1.       RARP( Working, Drawback ) 1.2.       GARP( Packet, Working, Uses ) 1.3.       PARP( Packet, Working ) 2.    Questions asked from TYPES OF ARP in the Network Engineer L1 Interview.   ·    There are 4 types of Arp:-   1.   RARP(Reverse Arp) 2.   GARP(Gratuitous Arp) 3.   PARP (Proxy Arp) 4.   InARP (Inverse Arp)   With the interview perspective only GARP and PARP are important and only these are being asked. So, I’ll explain GARP and PARP only. For the understanding perspective I’ll give a brief of RARP also but that’s just from the knowledge perspective and won’t be asked in the interview. Moving on with the types of Arp lets discuss them one by one.   1. RARP (Reverse Arp):-   RARP as could be understood from it...
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OSI and TCP/IP Model

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OSI MODEL   Table of Contents:- 1.     Introduction. 2.     Need of OSI MODEL. 3.     Definition of OSI MODEL. 4.     The 7 Layers and Their Explaination. 5.     TCP/IP MODEL. 6.     Difference between Segmentation and Fragmentation. 7.     Difference between MSS and MTU. 8.     Example for a better understanding of L2,L3,L4. 9.     Questions asked from OSI MODEL in the L1 Interview. l INTRODUCTION :- It is not an actual thing. It's just a conceptual Framework model that we have created for our reference to understand the complexity of the technology or network Infra, to ease troubleshooting and many more ways. After the completion of the Topic I’ll be providing you with the INTERVIEW QUESTIONS FOR NETWORK ENGINEER L1 ASKED FROM OSI MODEL and an Example for the better understanding of Layer 2, 3 and 4, where most of the people are...
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