Suppose client a initiates a telnet session with server s. at about the same time, client b also initiates a telnet session with server s. provide possible source and destination and source tcp port numbers for the followings transactions. use the well-known port number. make up valid tcp port numbers for client a and b.

(1) the segments sent from a to s.
(2) the segments sent from b to s.
(3) the segments sent from s to a
(4) the segments sent from s to b
(5) if a and b are in different hosts, is it possible that the source port number in the segments from a to s is the same as that from b to s?
(6) how about if they are the same host?

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w