1. B. Podcasting and blogs allow the one-way dissemination of information. Instant messaging allows the synchronous communication between individuals. A wiki allows groups of individuals to view and edit web pages collaboratively.
2. B, D. Peer-to-peer networks are inexpensive and easy to configure but lack any centralized management and do not scale well.
3. B, C, D, E. End devices form the interface between users and the underlying communication network.
4. C. Logical topology diagrams identify devices, ports, and IP addressing schemes. Physical topology diagrams identify the physical location of intermediate devices, configured ports, and cable installations.