Physical or logical perimeter of a system.
						                            Source(s):
						                            
								                            
                                                                    CNSSI 4009-2015
									                            
                                                                    NIST SP 800-172
									                            
						                            
						                            
						                        
					                            
						                              Physical or logical perimeter of a system. See also authorization boundary and interface.
						                            Source(s):
						                            
								                            
                                                                    NIST SP 800-53 Rev. 5
                                                                    from
                                                                            CNSSI 4009-2015