Introduction In popular usage, “Linux” often refers to a group of operating system distributions built around the Linux kernel. In the strictest sense, though, Linux refers only to the presence of the kernel itself. To build out a full operating system, Linux distributions often include tooling and libraries from the GNU project and other sources. […]

Constant or variable data type A data type describes the format and size of (amount of memory occupied by) a data item and defines what types of operations can be performed with the item. C# provides for 15 basic, or intrinsic types, of data, as shown in Table 2-1. 15 basic types – most common […]

TCP/IP’s Layered Architecture (p208) When a set of protocols works cooperatively, it’s called a protocol stack or protocol suite. The most common protocol stack is Transmission Control Protocol/Internet Protocol (TCP/IP), the Internet protocol suite. Role of Network Access Layer (p213) Provides a physical (MAC) address for the network interface. Verifies that incoming frames have the […]

Application: interfaces to access the network (DHCP, HTTP, FTP, etc) – PDU = data Presentation: presents the data (either generic in format / reassembles for delivery to App layer) – PDU = data Session: Establishes session before data sent (kinda a 3 way handshake). – does Checkpoints and Synchronization – authentication protocols – PDU = […]

Transmission Media general terminology 4 primary types of transmission media discussed Twisted Pair Coaxial Fiber Optics Wireless Terms: EMI – Electro magnetic Interference Crosstalk – jumping of data from one line to the next Attenuation – loss of signal strength over a distance Twisted Pair shielded / unshielded colors of wires cost effective 100 meters […]