can you paraphrase this paragraph

THE routers in the Internet core have witnessed several generations of changes in hardware while the main idea behind the routing algorithms has traditionally been remarkably similar. This is because the manner, in which the Internet core and the wired/wireless heterogeneous backbone networks are constructed, has largely remained unchanged over the years. On the other hand, to accommodate the tremendous growth of network traffic, the Internet core infrastructure has simply continued to scale up by adding more/larger routers and more/faster links. The increasingly larger core networks have driven the architectures of core routers to be more powerful in computation and switching capacities. Even with the recent surge in the data traffic, the network operators confront the challenges of traffic management for ensuring the quality of Service (QoS) as well as dealing with the declining profits. Traditionally, operators rely on the hardware solution in order to improve the core network performance, i.e., by simply increasing the number and size of routers and/or links, which results in a massive investment splurge. On the other hand, the software aspect of traffic management mainly focuses on the application of new routing strategies that may not be possible until a new generation of capable hardware architectures emerges. In other words, the advancement in the software-driven routing strategies appears to always fall behind the prevalent routing policies due to the continuously varying network environments.