Limit Registers: Limit registers in computer architecture are used to define the boundaries of the memory space that a process or application is permitted to access. They help protect the system by preventing a program from reading from or writing to memory outside its allocated area, thereby avoiding potential security breaches like buffer overflows.

Linear bus topology: A network configuration where all devices are connected to a single central cable or bus, forming a straight line. It is used in small networks where simplicity and low cost are the main priorities. Examples include home networks and small office networks.

Linear cryptanalysis: Linear cryptanalysis is a method for breaking symmetric cryptographic algorithms by creating linear approximations to describe the behavior of the block cipher. By analyzing input and output bits, cryptanalysts can find correlations that may lead to uncovering the secret key. It is a powerful tool for evaluating the strength of encryption algorithms.

Line Driver: A line driver is an electronic device that amplifies a digital signal, extending its transmission distance along communication lines. It is commonly used in settings where signals must travel long distances, such as telecommunications and network links. From a security standpoint, line drivers must be secured to ensure the integrity and confidentiality of the transmitted signals.

Link (or network access) layer (of TCP/IP model): The first layer of the TCP/IP model responsible for data transmission between devices on the same network. It encompasses protocols and standards for accessing the physical network, including technologies like Ethernet, Wi-Fi, and Bluetooth, facilitating device communication within the network.

Link-state routing protocol: A type of networking protocol that uses a link-state database to maintain information about the network topology and routes between nodes. It is used in computer networks to enable efficient routing of data between nodes. Examples include OSPF and IS-IS.