ACC-FLASH::accBrFiltPatternMask stores a hexadecimal mask (as an octet string) that defines which bits in a network packet should be examined when applying a bridge pattern filter. Network engineers use this to zero in on specific parts of a packet header, such as just the protocol type field, when deciding how to forward or discard traffic. For example, a mask of 0xFF000000 would examine only the first byte of a 4-byte field, ignoring the remaining three bytes.