In this episode, we explore several important concepts in computer science, including instruction caching, zombie processes, and Frame Relay networks.
How does Instruction Cache work?
Instruction cache speeds up program execution by storing recently executed instructions from the CPU. When the CPU needs the next instruction, it first checks if a copy is in the instruction cache. If it’s there (a “cache hit”), the CPU can read directly from the cache without accessing main memory. If it’s not (a “cache miss”), the CPU retrieves the instruction from main memory and places a copy in the cache for faster future access.
What is a Zombie Process?
A zombie process is a terminated process whose exit status hasn’t been collected by its parent process. When a child process finishes, it sends a signal to the parent process to indicate it has terminated. The parent process must then use the wait() system call to read the child’s exit status and free its resources. If the parent process doesn’t call wait() promptly, the child process becomes a zombie, occupying system resources.
How does VLAN work?
A VLAN (Virtual Local Area Network) is a technology that divides a physical network into multiple logical networks. With VLAN, network administrators can group devices into different VLANs, even if they aren’t physically in the same location. VLANs improve network security, reduce broadcast traffic, and simplify network management. VLANs rely on configuring switch ports as either Access or Trunk ports to control whether data frames carry VLAN tags.
What is a Frame Relay Network?
A Frame Relay network is a WAN (Wide Area Network) technology based on packet-switching, primarily used to connect company headquarters with branch offices. It uses virtual circuits to logically connect different endpoints, efficiently transmitting data frames between nodes. Known for its efficiency and low cost, Frame Relay was widely used in enterprise networks, but with newer technologies like MPLS, Frame Relay has gradually been phased out.
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