Select two reasons to use private IPv4 addressing.

Private IPv4 addresses are used to conserve public IPv4 addresses because they are not globally routable and can be reused in multiple private networks. This helps extend the lifespan of the limited public IPv4 address space. Additionally, using private addresses allows internal applications to treat these addresses as unique within their local network, simplifying network design and management without requiring registration or coordination with global IP registries. Renumbering is still necessary when merging networks, even with private addresses, as address overlap can occur. Private addresses do not expand routing tables; they reduce the need for public routes within an organization. While private addresses are not directly accessible from the internet, they don't inherently provide protection against denial-of-service attacks without additional security measures like firewalls.