MS Access - SQL - Optional From Clause

Kali Linux 2 - Metasploit Framework - SSH version scanner

Reserved IPv4 Address Space

Reserved IPv4 address space

3 Classes of network

class A is for a few subnet but each subnet has a lot of machine.
class C is for a lot of subnet but each subnet has few machine.
class B is in between class A and C.

Fiber Optic in Network diagram

Put FO on the media to represent fibre optic, 
then indicate it in the legend of your network diagram.

Kali Linux 2 - Metasploit Framework - Vsftpd Backdoor Command Execution

Kali Linux 2 - Metasploit - PHP CGI Argument Injection

Microsoft Access - Create relationship between tables

Microsoft Access - Primary Key

Microsoft Access - Primary Key

Foreign Key

Foreign Key:

It is used mainly to create relationship between tables.

The foreign key (MentorID) in the Course table is to create a relationship with the Mentor table MentorID (primary key).

The foreign key (CourseID) in the Student table is to create a relationship with the Course table CourseID (primary key).