Which is the right sequence of packets sent during the initial TCP three way handshake?
A.
FIN,FIN-ACK,ACK
B.
SYN,URG,ACK
C.
SYN,ACK,SYN-ACK
D.
SYN,SYN-ACK,ACK
Explanation:
A TCP connection always starts with a request for synchronization,a SYN,the reply
to that would be another SYN together with a ACK to acknowledge that the last package was
delivered successfully and the last part of the three way handshake should be only an ACK to
acknowledge that the SYN reply was recived.
Could someone please give an explanation on this one?!
If you don´t understand this question, you must not take the exam.
First read TCP/IP networks basics.
This is the “three way hanshake”
Step1 – HostA sends “SYN” (synchronization) packet to HostB
Step2 – If HostB wants to establish the comunication, HostB respond with “SYN and ACK” packets (synchronization/acknowledgement)
Step3 – The comunication continues with “ACK” packets.