Core switches serve as backups for each other

Sitting at the top of the hierarchical model, core switches interconnect distribution layer switches and provide high-speed data transfer across network segments. Unlike access or distribution switches, a core switch is optimized for Layer 3 performance, modular. Engineered to aggregate massive volumes of data from distribution switches, it provides ultra-low latency and maximum throughput to ensure uninterrupted routing and packet forwarding across the entire IT infrastructure. Simply put, it's the kingpin that keeps your network humming. It's responsible for accurately routing communication among layers and departments of different sections. [pdf]

How many core wires are in an optical cable splice closure

Splice closures: dome (vertical), inline (horizontal). Mechanical seal or heat shrink seal. There are hundreds of different designs and options on splice closures. Some closures are designed for connecting several smaller cables to a larger one for breaking out the larger cable to. YFSC-T48A Fiber Splice Closure, also known as Fiber Optical Splice closure, is a 2 inlet port, 2 outlet port mechanically sealed Horizontal Type Fiber Optical Splice closure, suitable for overhead and buried cable via split connection, comes with 2 splice trays with a maximum capacity of 24 cores. From a functional perspective, a fiber optic splice closure must address three core requirements at the same time. [pdf]

What ports should a core switch have

RJ45 ports serve access-layer copper connections; SFP/SFP+ ports enable flexible 1G/10G uplinks; SFP28 delivers 25G for modern data centers; QSFP+ and QSFP28 support high-density 40G/100G spine–leaf fabrics. They are characterized by numerous ports and high bandwidth, offering greater reliability, redundancy, throughput, and lower latency compared to access and aggregation switches. For a network with over 100 computers, a core switch is indispensable for ensuring stability and high performance. Engineered to aggregate massive volumes of data from distribution switches, it provides ultra-low latency and maximum throughput to ensure uninterrupted routing and packet. A core switch is the primary switch installed at the backbone of a layered or hierarchical network. [pdf]