Infrastructure, Systems, and Connectivity
Half-Duplex and Full-Duplex are the two primary data transmission modes in Ethernet networks. Half-Duplex allows transmission or reception in only one direction at a time and uses CSMA/CD, while Full-Duplex enables simultaneous sending and receiving, completely eliminating collisions. This article explains the differences between these two modes, how to configure them on Cisco switches and routers, their advantages and disadvantages, and practical examples.
Set Theory is the mathematical foundation of the relational database model. Concepts such as Union, Intersection, Difference, and Cartesian Product are directly implemented in SQL. Understanding these concepts helps database engineers write more logical, efficient, and powerful queries. This article explains the relationship between Set Theory and relational databases, the main operations, and practical SQL examples.
Collision Domain and Broadcast Domain are two fundamental concepts in Ethernet network design and troubleshooting. A Collision Domain is the portion of a network where packet collisions can occur, while a Broadcast Domain is the portion where broadcast frames are flooded to all devices. Cisco switches separate Collision Domains but not Broadcast Domains (unless VLANs are used), whereas routers separate both. This article explains these concepts in detail, their behavior in Cisco switches and routers, and practical examples.
