Communications Fundamentals FAQ

Chapter 15 FAQ

1. 15.12.1 What Is the Difference Between Networking and Internetworking
   1. What Is a Computer Network?
   2. What Is Networking?
   3. Why Isn't One Large Network Enough?
   4. What Is Internetworking?
   5. How Does the Internet Fit Into This Picture?
   6. What Role Do Routers Play?
   7. Why Are IP Addresses Needed?
   8. Can Different Network Technologies Work Together?
   9. Why Is Layering So Important?
   10. How Has Internetworking Changed the World?
   11. What Should You Remember?
2. 15.12.2 Why Do Computers Need IP Addresses
   1. What Is an IP Address?
   2. Why Isn't a Device Name Enough?
   3. Why Can't Computers Use MAC Addresses?
   4. How Is an IP Address Different from a MAC Address?
   5. What Does "Hierarchical Addressing" Mean?
   6. How Do Routers Use IP Addresses?
   7. Why Are There Two Versions of IP?
   8. What Is Network Address Translation?
   9. How Does an IP Address Reach the Correct Computer?
   10. Will IPv4 Eventually Disappear?
   11. Why Are IP Addresses So Important?
   12. What Should You Remember?
3. 15.12.3 What Is the Difference Between IPv4 and IPv6
   1. What Is the Internet Protocol?
   2. Why Was IPv4 Developed?
   3. Why Did IPv4 Run Out of Addresses?
   4. How Was the Problem Delayed?
   5. Why Was IPv6 Developed?
   6. How Are IPv4 and IPv6 Addresses Written?
   7. Is IPv6 Only About More Addresses?
   8. What Is the IPv6 Next Header Field?
   9. Are IPv4 and IPv6 Compatible?
   10. Will IPv6 Replace IPv4?
   11. Why Is IPv6 Important for the Future?
   12. What Should You Remember?
4. 15.12.4 How Does a Router Know Where to Send a Packet
   1. What Is a Router?
   2. Why Can't Ethernet Switches Perform This Job?
   3. What Is Inside an IP Packet?
   4. What Is a Routing Table?
   5. What Is the "Next Hop"?
   6. Does the Router Change the Packet?
   7. How Does the Router Find the Correct Local Device?
   8. How Do Routers Learn Routes?
   9. Is the Shortest Route Always Chosen?
   10. What Happens If a Router Fails?
   11. How Many Routers Does a Packet Usually Cross?
   12. Why Is Routing Such an Elegant Solution?
   13. What Should You Remember?
5. 15.12.5 What Happens When You Type a Website Address into a Browser
   1. Why Does It Happen So Quickly?
   2. What Is a Content Delivery Network?
   3. Is the Communication Secure?
   4. How Many Packets Are Involved?
   5. What Should You Remember?
6. 15.12.6 What Is the Difference Between TCP and UDP
   1. Why Does the Internet Need Transport Protocols?
   2. Why Are There Two Different Protocols?
   3. What Is TCP?
   4. Why Is Reliability Important?
   5. Does Reliability Have a Cost?
   6. What Is UDP?
   7. Why Would Anyone Accept Lost Packets?
   8. Which Applications Use UDP?
   9. Which Protocol Is Faster?
   10. How Do Applications Choose Between TCP and UDP?
   11. Do Users Need to Choose the Protocol?
   12. Can TCP and UDP Be Used Together?
   13. Will TCP and UDP Continue to Be Used?
   14. What Should You Remember?
7. 15.12.7 How Does the Internet Continue to Work When Parts of It Fail
   1. Was the Internet Designed to Survive Failures?
   2. What Does "Distributed" Mean?
   3. Why Are There Usually Several Possible Routes?
   4. How Do Routers Discover Better Routes?
   5. Does Every Router Know the Entire Internet?
   6. What Happens If a Fibre-Optic Cable Is Damaged?
   7. Can Packets Take Different Routes?
   8. What Happens If a Data Centre Fails?
   9. Why Doesn't the Internet Collapse During Natural Disasters?
   10. Has the Internet Ever Completely Failed?
   11. Is Reliability Becoming More Important?
   12. What Can Users Learn from This?
   13. What Should You Remember?
8. 15.12.8 What Is a Virtual Private Network (VPN), and Why Is It Used
   1. Why Is a VPN Needed?
   2. Why Is It Called a "Virtual" Private Network?
   3. How Does a VPN Work?
   4. Does a VPN Create a New Internet Connection?
   5. Where Are VPNs Commonly Used?
   6. Are VPNs Used on Public Wi-Fi?
   7. Does a VPN Make Internet Use Anonymous?
   8. Does a VPN Slow Down the Internet?
   9. Is HTTPS the Same as a VPN?
   10. Who Uses VPNs?
   11. Will VPNs Continue to Be Important?
   12. What Should You Remember?
9. 15.12.9 How Does the Internet Connect Billions of Devices
   1. How Big Is the Internet?
   2. Why Isn't the Internet One Giant Network?
   3. What Is a "Network of Networks"?
   4. How Do IP Addresses Help?
   5. What Do Routers Do?
   6. How Can So Many Organizations Work Together?
   7. Why Doesn't the Internet Become Overloaded?
   8. What Role Does Cloud Computing Play?
   9. What Is a Content Delivery Network?
   10. What About the Internet of Things?
   11. Can the Internet Continue Growing?
   12. What Makes the Internet Such a Remarkable Engineering Achievement?
   13. What Should You Remember?