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Interview Question – TRANSPORT LAYER of OSI model

This post is about the possible questions on TRANSPORT LAYER of OSI model.

  • What is difference between TCP and UDP.
  • TCP ports ranges – Reserved, Available and Private port range.
  • TCP header and explanation of each part.
  • What is the size of TCP header.
  • TCP flags – 9 flags explain all of them.
  • TCP windowing and MSS.
  • Define TCP three-way handshake.
  • TCP sequence no and ACK nos.
  • What is the difference between Segmentation and fragmentation.
  • What is the difference between FIN and RST flag.
  • What is the difference between PSH and URG flag.
  • What happens when we have RST flag with 0 Window.
  • What are the ports no. of  main protocols such as HTTP, HTTPS, FTP, SSH, TELNET, DNS etc.
  • Why we use UDP.
  • What is TCP sliding window procedure.
  • What happens when Packets are dropped in TCP and UDP.

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