The A refers to the certification on theâ¦ Airframe structure, to work on the wings, structure of the Frame or assemblies such as air vents for repairs. The P stands for Power Plant, The Certification repair for an Engine of a craft which also includes the hydraulic system.
Protocols. There are a number of VPN protocols in use that secure the transport of data traffic over a public network infrastructure. Each protocol varies slightly in the way that data is kept secure. IP security (IPSec) is used to secure communications over the Internet. IPSec traffic can use either transport mode or tunneling to encrypt data traffic in a VPN.
IEEE 802.1af provides authentication and cryptographic key distribution framework. Media Access Control (MAC) Security, often known as MACSec is a IEEE standard based protocol for securing communication among the trusted components of a 802.1 LAN.t is important to note that MACSec itself can not operate in itself to provide the promised services. It has to be used in conjunction with appropriate policies for complimentary and higher level protocol, and authentication and authorization framework and network management.