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Chapter 12
| 1: | Explain the relationship between TCP/IP and networks such as Ethernet. |
| A1: | Answer: TCP/IP is not a network. You run TCP/IP over networks, but it isn't a network unto itself. TCP/IP absolutely requires a network of some type to run over. |
| 2: | How many components are needed, at a minimum, to build a local-area network (LAN)? |
| A2: | Answer: All LANs consist of four primary components: two or more end-user devices such as computers, network interface cards (NICs) that connect those computers to the LAN, some medium over which to transmit signals, and a hub or switch that interconnects the end-user machines. |
| 3: | What is the difference between a hub and a switch? |
| A3: | Answer: A hub forces all devices connected to it to share the same bandwidth. A switch provides much higher performance by offering each device its own dedicated bandwidth. |
| 4: | Is coaxial cable obsolete or does it still serve a purpose? |
| A4: | Answer: Coaxial cable had verged on obsolescence but has found renewed life thanks to cable TV companies that use it to deliver high-bandwidth Internet connections. Today, home networks are typically constructed using either twisted-pair or wireless technologies and convert to coaxial cable only for Internet access. |
| 5: | What is a Category of Performance? |
| A5: | Answer: A Category of Performance is a speed rating given to twisted- pair cables. The higher the Cat-x number, the faster you can transmit over that wire. |
| 6: | What is the fastest speed at which a wireless network can operate? |
| A6: | Answer: The typical wireless network found in homes and small offices can run as fast as 54 megabits per second (Mbps) using either the IEEE 802.11g or 802.11a specifications. That technology is more frequently referred to as Wireless G and Wireless A, respectively. |
| 7: | What is the fastest speed at which an Ethernet wire-based network can operate? |
| A7: | Answer: Ethernet networks can run as fast as 10 gigabits per second (Gbps), but that speed is typically not used by end-user devices. End-user devices such as computers can connect to Ethernet networks at 10, 100, or 1000 megabits per second (Mbps). 1,000 Mbps is the same as 1 Gbps. |
| 8: | Which is more reliable: wire-based networks or wireless networks? |
| A8: | Answer: Wire-based networks are much more reliable because their signals are electrical impulses that travel through a copper wire. Those signals can suffer from certain types of interference, but they are less prone to such interference than wireless networks. Wireless networks can be impeded by a wide variety of forces, including other wireless devices and even microwave ovens. |
| 9: | What are the main drawbacks of wire-based networks? |
| A9: | Answer: Wire-based networks can't be as neat-looking as wireless networks. The amount of wire used to interconnect end-user devices to a network can become quite voluminous. Over time, that cable can become an unsightly mess, even in smaller networks. The second drawback is that the cabling is not at all flexible. You can bend it, but moves or changes more often than not mean you have to rerun new wires rather than being able to reuse the old wire. |
| 10: | What are the main advantages of wire-based networks? |
| A10: | Answer: Wire-based networks are more reliable, more secure, and faster than their wireless counterparts. |
| 11: | What do wireless networks use to transmit signals? |
| A11: | Answer: Wireless networks can use radio waves, microwaves, and even light waves to transmit signals. |
| 12: | What are the main benefits of wireless networks? |
| A12: | Answer: Wireless networks are easy to install, save you the expense of network wiring, and offer a neat appearance. More importantly, wireless networks enable you to be highly mobile; you can literally pick up your laptop and walk around your home without losing connectivity. |
