$1.$ What is a socket?

$2.$ What is a port?

$3.$ Why is it necessary to define port numbers at the receiving end for network services $($such as web, email, etc.$)?$

$4.$ Why is connection establishment in TCP necessary?

$5.$ Describe the three$-$way handshake used in TCP$.$

$6.$ What is the maximum number of possible TCP ports on a machine?

$7.$ Why is the initial sequence number for a connection chosen at random?

$8.$ A receiver sends an acknowledgment packet with the number $2817$ in the acknowledgment number field. What inference can the sender draw from this packet?

$9.$ What is the function of the window$-$size field in TCP$?$

$10.$ WWhat are some of the benefits of multipath TCP$?$

$11.$ What are some application scenarios where UDP may be more useful than TCP$?$

$12.$ Why is UDP more useful than TCP in some application scenarios?