| 1: | According to this book, what are the three major components of the Internet? |
| A1: | Answer: Networks built by ISPs, enterprise networks built by individual organizations, and the individual users who connect to an ISP |
| 2: | Leased lines provide a service of forwarding bits, whereas Frame Relay provides a service of forwarding Frame Relay frames. With that same perspective, explain the service that the Internet supplies to hosts. |
| A2: | Answer: The Internet provides a service of forwarding IP packets. |
| 3: | What is different about the type of electrical signal sent over the local loop by a phone, versus a modem? |
| A3: | Answer: There is no difference. Both phones and modems send an analog electrical signal. |
| 4: | What is different about the type of electrical signal sent over the local loop by a phone, versus a DSL modem? |
| A4: | Answer: The DSL modem sends a digital electrical signal, whereas the phone sends an analog electrical signal. |
| 5: | What two features of analog electrical signals, mentioned in this book, can a modem vary or change to encode a binary 0 or 1? |
| A5: | Answer: Modems can vary, or modulate, the frequency and amplitude. |
| 6: | Approximately what speed is the maximum transmission speed with modems? |
| A6: | Answer: 56 Kbps |
| 7: | Approximately what speed is the maximum transmission speed with DSL modems when the distance from the home to the CO is relatively long? |
| A7: | Answer: 384 Kbps |
| 8: | For DSL to work, the telco splits the data out from the voice using what kind of device? |
| A8: | Answer: A DSL access multiplexer (DSLAM) |
| 9: | What does DSL stand for? |
| A9: | Answer: Digital subscriber line |
| 10: | What does modem stand for? |
| A10: | Answer: Modem is not an acronym, but the term is formed by shortening and combining modulate and demodulate. |
| 11: | Which of the three Internet access technologies covered in this chapter does not allow you to talk on the phone while using the Internet? |
| A11: | Answer: Modems |
| 12: | What Layer 2 protocol is typically used when using a modem or DSL to connect to an ISP? |
| A12: | Answer: PPP |
