Client software is used to access network services provided by server software. The connection is established using a common network protocol known by both the client and server software. Thus, the client and server software can be from different sources.
Most common IP addresses and subnet masks share the same IPv4 formatting. An IPv4 address is a 32-bit number represented in four groups of three-digit numbers, known as octets, separated by periods. Each octet has a value between 0 and 255. An IPv6 address is a 128-bit number that's presented in eight groups of four-digit hexadecimal numbers separated by colons. This allows for a huge range of addresses, and as a result IPv6 addressing essentially includes subnet information.
The Privacy pane of Security & Privacy preferences can be used to allow or disallow applications' access to Location Services, Contacts, Calendars, Reminders, social network services, and Accessibility application access.
FileVault 2 protects the entire system volume and all its data by using strong XTS- AES 128 encryption. During system startup, a FileVault-enabled user must enter her password to decrypt the system volume.