Cracking the Coding Interview - Fooo

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Solutions to Chapter 17 | Networking 17 2 Explain any common routing protocol in detail For example: BGP, OSPF, RIP SOLUTION CareerCup com pg 84 Depending on the reader’s level of understanding, knowledge, interest or career aspirations, he or she may wish to explore beyond what is included here Wikipedia and other websites are great places to look for a deeper understanding We will provide only a short summary BGP: Border Gateway Protocol BGP is the core routing protocol of the Internet “When a BGP router first comes up on the Internet, either for the first time or after being turned off, it establishes connections with the other BGP routers with which it directly communicates The first thing it does is download the entire routing table of each neighboring router After that it only exchanges much shorter update messages with other routers BGP routers send and receive update messages to indicate a change in the preferred path to reach a computer with a given IP address If the router decides to update its own routing tables because this new path is better, then it will subsequently propagate this information to all of the other neighboring BGP routers to which it is connected, and they will in turn decide whether to update their own tables and propagate the information further ” Borrowed from http://www livinginternet com/i/iw_route_egp_bgp htm RIP: Routing Information Protocol “RIP provides the standard IGP protocol for local area networks, and provides great network stability, guaranteeing that if one network connection goes down the network can quickly adapt to send packets through another connection “ “What makes RIP work is a routing database that stores information on the fastest route from computer to computer, an update process that enables each router to tell other routers which route is the fastest from its point of view, and an update algorithm that enables each router to update its database with the fastest route communicated from neighboring routers ” Borrowing from http://www livinginternet com/i/iw_route_igp_rip htm OSPF: Open Shortest Path First “Open Shortest Path First (OSPF) is a particularly efficient IGP routing protocol that is faster than RIP, but also more complex ” The main difference between OSPF and RIP is that RIP only keeps track of the closest router for each destination address, while OSPF keeps track of a complete topological database of all connections in the local network The OSPF algorithm works as described below 2 5 0
Solutions to Chapter 17 | Networking » Startup When a router is turned on it sends Hello packets to all of its neighbors, receives their Hello packets in return, and establishes routing connections by synchronizing databases with adjacent routers that agree to synchronize » Update At regular intervals each router sends an update message called its “link state” describing its routing database to all the other routers, so that all routers have the same description of the topology of the local network » Shortest path tree Each router then calculates a mathematical data structure called a “shortest path tree” that describes the shortest path to each destination address and therefore indicates the closest router to send to for each communication; in other words -- “open shortest path first” See http://www livinginternet com/i/iw_route_igp_ospf htm 2 5 1 Cracking the Coding Interview | Knowledge Based
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CRACKING THE C O D I N G I N T E R
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CRACKING THE C O D I N G I N T E R
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Table of Contents Foreword 4 Introd
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Dear Readers, CareerCup com Forewor
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My Approach Introduction The focus
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Behind the Scenes | The Microsoft I
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Behind the Scenes | The Google Inte
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Behind the Scenes | The Yahoo Inter
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Interview War Stories the next few
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Interview War Stories | Failure to
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Interview War Stories | You Can (Ma
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Before the Interview
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Before the Interview | Resume Advic
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Before the Interview | Behavioral P
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What You Need To Know Before the In
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At the Interview | Handling Behavio
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At the Interview | Handling Technic
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At the Interview | Handling Technic
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At the Interview | Five Algorithm A
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At the Interview | The Offer and Be
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At the Interview | Top Ten Mistakes
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At the Interview | Frequently Asked
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Interview Questions How This Book i
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Part 1 Data Structures
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Chapter 1 | Arrays and Strings 1 1
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2 1 Write code to remove duplicates
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Chapter 3 | Stacks and Queues 3 1 D
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Chapter 4 | Trees and Graphs 4 1 Im
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Chapter 5 | Bit Manipulation How to
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Chapter 6 | Brain Teasers Do compan
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Chapter 7 | Object Oriented Design
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Chapter 8 | Recursion How to Recogn
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Chapter 9 | Sorting and Searching H
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Chapter 10 | Mathematical How to Ap
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Chapter 11 | Testing Testing Proble
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Chapter 12 | System Design and Memo
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Part 3 Knowledge Based
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Chapter 13 | C++ 13 1 Write a metho
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Chapter 14 | Java 14 1 In terms of
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Chapter 15 | Databases 15 1 Write a
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Chapter 16 | Low Level 16 1 Explain
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Chapter 17 | Networking 17 1 Explai
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Chapter 18 | Threads and Locks 18 1
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Chapter 19 | Moderate 19 1 Write a
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Chapter 20 | Hard 20 1 Write a func
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Each problem may have many 'optimal
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Solutions to Chapter 1 | Arrays and
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Solutions to Chapter 2 | Linked Lis
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Approach 2: Solutions to Chapter 3
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Solutions to Chapter 3 | Stacks and
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Solutions to Chapter 7 | Object Ori
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About the Author Gayle Laakmann’s
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Cracking the Coding Interview - Fooo

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