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Networking Essentials FAQs

Explore common networking questions - PDU at different layers, Ethernet switch speed, encoding techniques, standards, wireless tech, and curriculum myths. Get answers here!

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Networking Essentials FAQs

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  1. After 8.1

  2. What PDU is used at layer 3? • Bits • Packet • Segment • Frame • Something else 1 of 3

  3. What PDU is used at layer 1? • Bits • Packet • Segment • Frame • Something else 2 of 3

  4. Which function is not part of layer 1? • Physical and electrical properties of the media • Mechanical properties of the connectors • Routing • Representation of bits on the media • Encoding of control signals 3 of 3

  5. After 8.2

  6. An Ethernet switch is labeled “100 Mbps”. What is that value? • Bandwidth • Throughput • Goodput • Frequency • Bit time

  7. This Windows box shows a speed of 27.7 MB/second. What is that value? • Bandwidth • Throughput • Goodput • Frequency • Bit time

  8. What technique uses 10 bits to encode a single byte? • AM • 4B/5B • Manchester • NRZ • FM

  9. Which technique signals a 1 with a low-to-high voltage transition and a 0 with a high-to-low voltage transition? • 4B/5B • Optical • Manchester • NRZ • AM

  10. Which technique is so slow that it can't even transmit 10 Mbps? • AM • Optical • Manchester • NRZ • 4B/5B

  11. After 8.3

  12. Which standard allows segment lengths up to 80 km? • 10BASE-T • 100BASE-TX • 100BASE-FX • 1000BASE-T • 10GBASE-ZR

  13. Which standard is the slowest? • 10BASE-T • 100BASE-TX • 100BASE-FX • 1000BASE-T • 10GBASE-ZR

  14. Which standard is used by normal voice-only cell phones? • 802.15 • 802.11 • 802.16 • GSM • 802.3

  15. Which wireless technology is the slowest? • 802.11a • 802.11b • 802.11g • 802.11n • 802.15

  16. Error in the Curriculum! • 8.3.6 says "Because light can only travel in one direction over optical fiber, two fibers are required to support full duplex operation" • WRONG • Light can travel both directions simultaneously through glass--we all know that. Two fibers are used merely as a convenience, to make the receivers and transmitters cheaper.

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