Cracking the Coding Interview, 4 Edition - 150 Programming Interview Questions and Solutions

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Solutions to Chapter 17 | Networking 4. Improved methods to change ISP 5. Better mobility support 6. Multi-homing 7. Security 8. Scoped address: link-local, site-local and global-address space 2 5 3 Cracking the Coding Interview | Knowledge Based
Solutions to Chapter 17 | Networking 17.4 What is a network / subnet mask? Explain how host A sends a message / packet to host B when: (a) both are on same network and (b) both are on different networks. Explain which layer makes the routing decision and how. SOLUTION pg 84 A mask is a bit pattern used to identify the network/subnet address. The IP address consists of two components: the network address and the host address. The IP addresses are categorized into different classes which are used to identify the network address. Example: Consider IP address 152.210.011.002. This address belongs to Class B, so: Network Mask: 11111111.11111111.00000000.00000000 Given Address: 10011000.11010101.00001011.00000010 By ANDing Network Mask and IP Address, we get the following network address: 10011000.11010101.00000000.00000000 (152.210.0.0) Host address: 00001011.00000010 Similarly, a network administrator can divide any network into sub-networks by using subnet mask. To do this, we further divide the host address into two or more subnets. For example, if the above network is divided into 18 subnets (requiring a minimum of 5 bits to represent 18 subnets), the first 5 bits will be used to identify the subnet address. Subnet Mask: 11111111.11111111.11111000.00000000 (255.255.248.0) Given Address: 10011000.11010101.00001011.00000010 So, by ANDing the subnet mask and the given address, we get the following subnet address: 10011000.11010101.00001000.00000000 (152.210.1.0) How Host A sends a message/packet to Host B: When both are on same network: the host address bits are used to identify the host within the network. Both are on different networks: the router uses the network mask to identify the network and route the packet. The host can be identified using the network host address. The network layer is responsible for making routing decisions. A routing table is used to store the path information and the cost involved with that path, while a routing algorithm uses the routing table to decide the path on which to route the packets. Routing is broadly classified into Static and Dynamic Routing based on whether the table is fixed or it changes based on the current network condition. CareerCup.com 2 5 4
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CRACKING THE FOURTH EDITION C O D I
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Table of Contents Chapter 7 | Objec
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Introduction Something’s Wrong We
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Behind the Scenes For many candidat
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Behind the Scenes | The Amazon Inte
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Behind the Scenes | The Apple Inter
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Interview War Stories The View from
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Interview War Stories | Pop Divas P
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Interview War Stories | You Can (Ma
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Interview War Stories | Spider Sens
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Before the Interview | Resume Advic
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Before the Interview | Behavioral P
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Before the Interview | Technical Pr
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The Interview and Beyond
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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 | Five Algorithm A
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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
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Chapter 1 | Arrays and Strings Hash
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Chapter 2 | Linked Lists How to App
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Chapter 3 | Stacks and Queues How t
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Chapter 4 | Trees and Graphs How to
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Part 2 Concepts and Algorithms
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Chapter 5 | Bit Manipulation 5.1 Yo
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Chapter 6 | Brain Teasers 6.1 Add a
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Chapter 7 | Object Oriented Design
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Chapter 8 | Recursion 8.1 Write a m
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Chapter 9 | Sorting and Searching 9
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Chapter 10 | Mathematical 10.1 You
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Chapter 11 | Testing 11.1 Find the
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Chapter 12 | System Design and Memo
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Chapter 13 | C++ How To Approach: A
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Chapter 14 | Java How to Approach:
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Chapter 15 | Databases How to Appro
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Chapter 16 | Low Level How to Appro
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Chapter 17 | Networking How to Appr
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Chapter 18 | Threads and Locks How
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Part 4 Additional Review Problems
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Chapter 19 | Moderate _____________
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Chapter 20 | Hard Input: DAMP, LIKE
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Solutions
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Solutions to Chapter 1 | Arrays and
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Solutions to Chapter 2 | Linked Lis
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Solutions to Chapter 3 | Stacks and
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Solutions to Chapter 4 | Trees and
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Solutions to Chapter 5 | Bit Manipu
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Solutions to Chapter 6 | Brain Teas
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Solutions to Chapter 7 | Object Ori
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Solutions to Chapter 8 | Recursion
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Solutions to Chapter 9 | Sorting an
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Solutions to Chapter 10 | Mathemati
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Solutions to Chapter 11 | System De
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Solutions to Chapter 11 | System De
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Page 201 and 202: Solutions to Chapter 12 | Testing 1
Page 207 and 208: Solutions to Chapter 13 | C++ 13.2
Page 213 and 214: Solutions to Chapter 13 | C++ Then
Page 217 and 218: Solutions to Chapter 14 | Java 14.2
Page 223 and 224: Solutions to Chapter 15 | Databases
Page 229 and 230: Solutions to Chapter 16 | Low Level
Page 241 and 242: Solutions to Chapter 17 | Networkin
Page 243: Solutions to Chapter 17 | Networkin
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Page 249 and 250: Solutions to Chapter 18 | Threads a
Page 257 and 258: Solutions to Chapter 19 | Moderate
Page 271 and 272: Solutions to Chapter 20 | Hard 2. O
Page 273 and 274: Solutions to Chapter 20 | Hard 20.3
Page 275 and 276: Solutions to Chapter 20 | Hard 10 1
Page 283 and 284: Solutions to Chapter 20 | Hard 28 i
Page 285 and 286: Solutions to Chapter 20 | Hard 23 }
Page 287 and 288: Solutions to Chapter 20 | Hard Val_
Page 291 and 292: Index A arithmetic 108, 131, 143, 1
Page 293: Mock Interviews Mock Interviews Stu
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