The bottom line is that passive scanning in systems can expose a lot of information about all aspects of the system in normal communications without intruding upon operations. Active scanning has the potential to discover more information, and when combined with passive scanning, it gives a more complete picture.
Brick sizes vary depending on the country, the manufacturer and the purpose for which they are intended. In the United States, standard modern bricks are usually about 8 Ã 4 Ã 2.25 inches (203 Ã 102 Ã 57 mm). modular bricks are 7 5/8 long x 3 5/8 thick x3 5/8 deep.
Standard Brick Dimensions. The standard brick sizes depend on the country where it is made. In the United Kingdom, the size used is 64 mm or 2.5 in. In some cases the brick is less than 2.5 inches deep. In the United States, the standard size is 8 Ã 4 Ã 2.25 inches (203 Ã 102 Ã 57 mm).In Australia the average size is 9 x 4.33 x 3 inches (230 x 110 x 76 mm). The size in South Africa is 8.75 x 4 x 3 inches (222 x 106 x 73 mm).ote that the standard dimensions given by manufacturers may sometimes be nominal, not actual. For example, the 4 x 2 2/3 x 8 brick size actually measures 3 5/8 x 2 Â¼ x 8. The modular size 4 x 2 2/3 x 8 is in actuality 3 5/8 x 2 Â¼ x 7 5/8.