selects the newar 8 with the highest preference value however if that newar 8 denies the ctr request the newar 8 the next highest preference value is targeted after the mn 28 has transmitted the ctinit message it waits to receive back a content transfer acknowledgement ctack message the ctack message comprises an icmp echo reply message if no ctack message is received within a timeout period the mn 28 retransmits the ctinit message this is done repeatedly until either a ctack is received or a maximum count of retries has been reached whereby the feature context transfer to that newar 8 is abandoned and another newar 8 is targeted the format of a ctack message is shown in fig3 a description of the terminology used in fig3 follows in table 4 no code value is currently used with the ctack echo reply message for the ctack message the mn 39 s identity is echoed back to the mn 28 so that it can match it with the mn 39 s identity previously sent with the ctinit message after the ctinit message is received the cta 14 in the oldar 6 sends a context transfer request ctr message to the cta 14 of the newar 8 upon receiving the ctr message the cta 14 in the newar 8 authenticates the oldar 6 authentication ensures that the oldar 6 is to be trusted and the information conveyed is correct the.