Syngress - Eleventh Hour Network+ Exam N10-004 Study Guide (11 ...

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36 CHAPTER 2 Network Media electromagnets whose presence can interfere with the flow of electrons along the UTP cable. Incorrect answers and explanations: B, C, and D. Answer B is incorrect because static electricity may cause damage to network cards and other electronics, but will not interfere with network traffic on a UTP cable. Answer C is incorrect because transceivers are the portion of a network interface that transmits and receives electrical signals across the transmission media. It is unlikely that this is a cause of the problem. Answer D is incorrect because the small motor is most likely to be the source of this interference. Anytime a UTP cable is near EMI there will be communications problems. 3. Correct answer and explanation: C. Use 10BaseT cabling in each of the buildings, and connect the two buildings together using 10Base5 cabling. The two offices can be connected using thick coaxial cable (10Base5), which can transfer data up to 500 m. 10BaseT can be used within the buildings because it supports distances of 100 m. Incorrect answers and explanations: A, B, and D. Answer A is incorrect because 10BaseT has a distance limitation of 100 m. This means that the two buildings can’t be connected together. Answer B is incorrect because 10Base2 has a distance limitation of 185 m, which is too short for the two buildings. Answer D is also incorrect because 10BaseT has a distance limitation of 100 m. 4. Correct answer and explanation: C. Half-duplex. 100BaseFX is an Ethernet standard that uses fiber-optic cabling. It can transmit data at speeds of 100 Mbps, but if communication is half-duplex, it can transmit data across cable segments that are up to 400 m in length. If full duplex is used, then it can transmit data up to 2 km. Because data travels both ways on the medium but in only one direction at a time, half-duplex is being described. Incorrect answers and explanations: A, B, and D. Answer A is incorrect because simplex refers to data moving in a single direction. Answer B is incorrect because FireWire is a proprietary name for IEEE1394, which is an external bus that supports fast data-transfer rates of 400 Mbps and 800 Mbps. Answer D is incorrect because full duplex refers to data traveling in both directions simultaneously. 5. Correct answer and explanation: C. 100BaseTX uses two UTP pairs (four wires) in a Category 5 UTP cable. Incorrect answers and explanation: A, B, and D. Answer A is incorrect because 10BaseT requires Category 3 UTP and only operates at 10 Mbps. Answer B is incorrect because 100BaseFL doesn’t exist, it’s really 10BaseFL, and it requires 10 Mbps fiber-optic cable. Answer D is incorrect because 100BoardT4 is not a legitimate networking standard.
CHAPTER 3 Network Devices 37 <strong>Exam</strong> objective in this chapter ■ Network Devices NETWORK DEVICES Network devices are the components of a set of interconnected computer systems that understand the network layout and can efficiently route traffic to its intended destination. They generally connect to each of the computer systems in the network via the types of physical media covered in Chapter 2 and provide security features in addition to the features centered on establishing and maintaining efficient connectivity. Fast Facts There exist a number of different network devices, including routers, switches, and hubs, each of which maps to a particular layer of the Open Systems Interconnection (OSI) model. Table 3.1 displays some of these devices and their mappings. Repeaters The repeater will take a signal that may be weakening and regenerate it to its original strength so that the data doesn’t corrupt as it travels over long distances. Hubs Hubs, or concentrators, are central devices where network cabling is connected. Multiple cables connect into the hub, providing a method for data to be passed from one cable to another. Characteristics of a hub are as follows:
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CHAPTER 7 Wide Area Networking 107
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Internet Access Methods 113 EXAM WA
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156 CHAPTER 10 Network Troubleshoot
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Glossary 177 Access Determines who
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188 Index Network troubleshooting,
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