Q: TCP Transport Ports

By certskills October 9, 2018 09:05

Most CCNA candidates focus on the topics that require deeper learning, topics that you need to configure, verify, and troubleshoot on routers and switches. At the same time, Cisco includes a small set of topics for which you need only conceptual knowledge. The TCP/IP Transport layer happens to be one of those topics and is the focus of today’s question.

The Question

The PC on the left of the figure opens URL https://www.example.com, which creates a TCP connection with the web server on the right. Which of the answers lists correct facts about the 3rd TCP segment in the TCP connection establishment flow?

A) SYN flag set, but ACK not set

B) SYN flag and ACK flags set

C) ACK flag set, but SYN flag not set

D) Destination port 80

E) Destination port 443

F) Destination port > 1023


Figure 1: Web Browser Connecting to Web Server


Answer Post in a Few Days!

I’ll post an answer post in a few days. Watch for it! It should be the next post in chronological order as well, so watch for the link at the bottom of this page (just above the comments section).

A: TCP/IP Model Lingo
A: TCP Transport Ports
By certskills October 9, 2018 09:05
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  1. Bobby October 9, 10:04

    The 3rd part of the TCP handshake. (c)

    Reply to this comment
  2. Nicholas October 10, 09:56

    B) SYN flag and ACK flags set

    Reply to this comment
  3. Mit October 10, 12:24

    C & E

    Reply to this comment
  4. Matt October 10, 16:20

    I think C and E as well.

    Reply to this comment
  5. Matt October 11, 01:32

    Yes, the answer are C and E.

    Reply to this comment
  6. Moses November 26, 22:05

    I see there is a Syn but no Ack so my answer will be A &E

    Reply to this comment
  7. Naeem Khaliq July 18, 05:04

    So the required answer wants the 3rd part of the 3 way handshake. So from what I remember its SYN, SYN ACK, and then ACK.

    From the listed answers the correct one should be C

    Reply to this comment
  8. laurent July 19, 10:08

    where can I see a definite answer here?

    Reply to this comment
  9. laurent July 19, 10:21

    sorry you get it in the next page!

    Reply to this comment
  10. Rob September 1, 12:05

    Its got to be either B or E…

    Reply to this comment
  11. Punya Atma March 10, 20:52

    the answer is, C

    Reply to this comment
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