Please explain the following questions:
Which of the TCP connection-establishment flows sets both the SYN and ACK flags in the TCP header?
a. First segment
b. Second segment
c. Third segment
d. Fourth segment
e. Fifth segment
Which of the following protocols are reliable?
a. Frame Relay
Answer:B (why not A it is also connection oriented)
I'm really not to sure about your first question.
But looking at the second question. We know TCP is reliable and works at layer 4 of the OSI. We also know that Frame-relay works at layer 2 and is just a method of encapsulating data. There are also different encapsulation types such as IETF and Cisco.
Remember the initial virtual circuit is predetermined at layer 4. Where it can be reliable or not.
Hope this makes sense.