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.
Note 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.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.