While the number of penicillin-resistant bacteria is increasing, penicillin can still be used to treat a wide range of infections caused by certain susceptible bacteria, including Streptococci, Staphylococci, Clostridium, and Listeria genera.
The Internet is the largest computer network. It is composed of thousands of smaller networks and connects billions of devices worldwide, handling the majority of data communication that occurs on a daily basis. The largest private network is the NIPRNet, owned by the U.S. Department of Defense for distribution of communications. It has data services that allow customers access to a large, centralized, protected network, mainly used by military support roles.
A Wide Area Network ( WAN) is a computer network covering multiple distance areas, which may spread across the entire world. WANs often connect multiple smaller networks, such as local area networks (LANs) or metro area networks (MANs). The world's most popular WAN is the Internet. Some segments of the Internet are also WANs in themselves. The key difference between WAN and LAN technologies is scalability.