Four-letter group that every message that is to be transmitted must have as the end as the node are programmed to search for it before entering it into the network.
Iqela loonobumba abane lokuba umyalezo ngamnye oza kudluliswa kumele uphele njengokuba iindibano-malungu zilungiselelwe ukuba ziwukhangele phambi kokuba ufakwe kwinethwekhi.