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Hands-On Network Programming with C

You're reading from   Hands-On Network Programming with C Learn socket programming in C and write secure and optimized network code

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Product type Paperback
Published in May 2019
Publisher Packt
ISBN-13 9781789349863
Length 478 pages
Edition 1st Edition
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Author (1):
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Lewis Van Winkle Lewis Van Winkle
Author Profile Icon Lewis Van Winkle
Lewis Van Winkle
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Table of Contents (26) Chapters Close

Title Page
Copyright and Credits
Dedication
About Packt Contributors Preface 1. Introducing Networks and Protocols FREE CHAPTER 2. Getting to Grips with Socket APIs 3. An In-Depth Overview of TCP Connections 4. Establishing UDP Connections 5. Hostname Resolution and DNS 6. Building a Simple Web Client 7. Building a Simple Web Server 8. Making Your Program Send Email 9. Loading Secure Web Pages with HTTPS and OpenSSL 10. Implementing a Secure Web Server 11. Establishing SSH Connections with libssh 12. Network Monitoring and Security 13. Socket Programming Tips and Pitfalls 14. Web Programming for the Internet of Things 1. Answers to Questions 2. Setting Up Your C Compiler on Windows 3. Setting Up Your C Compiler on Linux 4. Setting Up Your C Compiler on macOS 5. Example Programs 6. Other Book You May Enjoy

Chapter 4, Establishing UDP Connections

  1. How do sendto() and recvfrom() differ from send() and recv()?

The send() and recv() functions are useful after calling connect(). They only work with the one remote address that was passed to connect(). The sendto() and recvfrom() functions can be used with multiple remote addresses.

  1. Can send() and recv() be used on UDP sockets?

Yes. The connect() function should be called first in that case. However, the sendto() and recvfrom() functions are often more useful for UDP sockets.

  1. What does connect() do in the case of a UDP socket?

The connect() function associates the socket with a remote address.

  1. What makes multiplexing with UDP easier than with TCP?

One UDP socket can talk to multiple remote peers. For TCP, one socket is needed for each peer.

  1. What are the downsides to UDP when compared to TCP?

UDP does not attempt to fix many of the errors that TCP does. For example, TCP ensures that data arrives in the same order it was sent, TCP tries to avoid causing network congestion, and TCP attempts to resend lost packets. UDP does none of this.

  1. Can the same program use UDP and TCP?

Yes. It just needs to create sockets for both.

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