Ethernet became dominant because ______.

a. it is the least expensive LAN technology

b. it is a simple LAN technology

c. Both of the above.

ANS:

2. In broadband transmission, signals are injected directly into a high-speed transmission medium.

a. True.

b. False.

ANS:

3. Which of the following is being considered for the next generation of Ethernet speeds?

a. 40 Gbps

b. 1000 Gbps

c. Both of the above.

ANS:

4. Ethernet addresses are called logical addresses.

a. True.

b. False.

ANS:

5. If there is a PAD field, it will be added by the _____.

a. sender.

b. receiver.

c. Both of the above.

ANS:

6. Which of the following usually has higher port speeds?

a. Workgroup switches.

b. Core switches.

c. Both of the above.

d. Neither A nor B

ANS:

7. VLANs can be used to provide security.

a. True.

b. False.

ANS:

8. You can buy switches in almost any port and speed configuration you wish.

a. True.

b. False.

ANS:

9. (If you read the box "Advanced Purchasing Considerations: Physical and Electrical Features.") In equipment racks, 1 U is _____.

a. 1 inch

b. 1 cm

c. 19 inches

d. 19 cm

e. None of the above.

ANS:

10. The _____ standard was created to prevent attackers from walking in and simply plugging a computer into a wall jack and therefore accessing the network.

a. STP

b. 802.1AE

c POE

d. 802.1X

e. None of the above.

ANS:

11. The terms channel and service band mean roughly the same thing.

a. True.

b. False.

ANS:

12. What is the dividing line between narrowband and broadband speeds?

a. 75 kbps.

b 200 kbps.

c. 1 Mbps.

d. 100 Mbps.

e. 1 Gbps.

ANS:

13. 802.11a supports _____ nonoverlapping channels.

a. 1

b. 3

c. 7

d. More than 10

14. Placing access points so that they will not interfere with one another is easiest in the _____ band.

a. 2.4 GHz

b. 5.6 GHz

c. 8.2 GHZ

d. None of the above.

ANS:

15. Access points take frames from wireless devices and send these frames on to devices on the wired LAN. They also do the converse.

a. True.

b. False.

ANS:

16. (From the box, "Controlling 802.11 Transmission") CSMA/CA+ACK is _____.

a. efficient

b. inefficient

ANS:

17. The rated speed of 802.11a is _____.

a. 2 Mbps

b. 11 Mbps

c. 52 Mbps

d. None of the above.

ANS:

18. MIMO increases _____.

a. throughput

b. propagation distance

c. Both of the above.

d. Neither A nor B

ANS:

19. Who created WPA?

a. The Internet Engineering Task Force.

b. ISO.

c. The 802.3 Working Group.

d. The 802.11 Working Group.

e. The Wi-Fi Alliance.

ANS:

20. PSK prevents the use of strong keys.

a. True.

b. False.

ANS:

21. Application profiles are attractive because they allow devices to work with one another automatically at the network layer.

a. True.

b. False.

ANS:

22. In the PBX system, the least expensive is wiring.

True

False

ANS:

23. Which part of the PSTN is changing more rapidly?

a. The access system.

b. The transport core.

c. Both of the above are changing with equal speed.

ANS:

24. Circuit switching is reasonably efficient for _____.

a. voice

b. data

c. Both of the above.

d. Neither A nor B

ANS:

25. In TDM, a conversation receives 8 bits in each _____.

a. frame

b. mode

c. slot

d. second

ANS:

26. A(n) _____ signal rises and falls in intensity smoothly.

a. analog

b. digital

c. Both of the above.

d. Neither A nor B

ANS:

27. In cellular technology, a cellsite is a small geographical area.

a. True.

b. False.

ANS:

28. VoIP is the transmission of telephone signals over circuit-switched networks.

a. True.

b. False.

ANS:

29. Which header comes SECOND in a VoIP transport packet?

a. RTP.

b. UDP.

c. IP.

d. Application.

ANS:

30. It is easier to implement VoIP on wired LANs than on wireless LANs.

a. True.

b. False.

ANS:

31. Companies are concerned that VoIP will have lower _____ than PSTN service.

a. availability

b. sound quality

c. Both of the above.

d. Neither A nor B

ANS:

32. In ADSL service, new wires must be laid to the subscriber in order to provide high-speed service.

a. True.

b. False.

ANS:

33. DSL modems tie up your telephone line when you use them to carry data.

a. True.

b. False.

ANS:

Very Short Essay Questions

1. Distinguish between the MAC and LLC layers.

Answer:

2. How are switches in an Ethernet LAN organized?

Answer

3. Why has Ethernet become the dominant LAN technology?

Answer:

4. What standard allows redundancy in Ethernet networks?

Answer:

5. How does CSMA/CD work?

Answer:

6. What is the golden zone in commercial mobile radio transmission?

Answer:

7. What is the advantage and disadvantage of using unlicensed bands?

Answer:

8. What is a handoff in 802.11?

Answer:

9. b) Why is CSMA/CA+ACK inefficient?

Answer:

10. What are the rated speeds of 802.11, 802.11a, and 802.11b?

Answer:

11. What disadvantages does 802.11a have compared with 802.11g?

Answer:

12. What are the four technical elements in the PSTN?

Answer:

13. What is an end office switch?

Answer:

14. What parts of the telephone system are largely digital today?

Answer:

15. Why does cellular telephony use cells?

Answer:

Problem

1-( 6) What are the differences between Nyquist and Shannon theories?

Answer:

2-( 8) Consider a noisy channel with a bandwidth of 2500 HZ and value of signal-to-noise ratio of 15. What would be the maximum bit rate of this channel?

Answer:

3-( 8) Assume a signal with a bandwidth of 2500 HZ and signal level of 4. What would be the capacity of this signal?

Answer:

\fThe Tax Cuts and Jobs Act removed computers and peripheral equipment placed in service after 2017 from the definition of listed property. Therefore, computers and peripheral equipment placed in service after December 31, 2017, would not be considered as listed property. Based on the above discussion, the following items are NOT listed property: Computer used exclusively in a regular place of business that was placed in service on July 27, 2018.Question 15 1.2 pts How can conflict be a positive experience for group members? Conflict can isolate and eliminate team members who do not follow acceptable group norms. Conflict can eliminate the opportunity for groupthink to take hold. Conflict can set precedents for future actions. O Conflict can increase the involvement of team members and generate creative ideas for problem solving. O Conflict resolution will result in increased team happiness and harmony. D Question 16 1.2 pts Which of the following is a key difference between financial accounting and management accounting? Financial accounting creates information for outsiders, whereas management accounting is for insiders. O Financial accounting is concerned with preparing cost analyses, whereas management accounting is concerned with creating reports. O Accounting knowledge creates information for all stakeholders, whereas accounting knowledge is used for internal purposes only. O. Financial accounting considers such aspects as profitability, whereas management accounting does not consider profitability. )Management accounting is based on historical data, whereas financial accounting is based on real time data.1. Which of the following is the most appropriate definition of accounting? a. electronic collection, organization, and communication of vast amounts of information b. the interconnected network of subsystems necessary to opera a business c. a means of recording transactions and keeping records d. the measurement, processing, and communication of financi information about an identifiable economic entityThe partnership of Wingler, Norris, Rodgers, and Guthrie was formed several years ago as a architectural firm. Several partners recently had personal financial problems and decided to terminate operations and liquidate the business The following balance sheet summarized It's financial information on January 5 at the beginning of this process: Cash $17,000 Liabilities $79,000 Accounts Receivable 80,000 Rodgers, Loan 25,000 Inventory 100,000 Wingler, Capital 141,000 Land 57,000 Norris, Capital 100,000 Building and Equipment (net) 193,000 Rodgers, Capital 62,000 Total Assets 447,000 Guthrie, Capital Total Liabilities and Capital 447,000 The estimated liquidation expenses were 18,000 Profit and loss allocation ratio according to the provisions of partnership agreement: Wingler 40% Norris 20 Rodgers 10% Guthrie 30% The following transactions occurred during the liquidation: Jan. 14 Collected 70% of the total accounts receivalbe with the rest judged to be uncollectible 709 Feb. 23 Sold the land, building and equipment for 180,00 0 Mar. 1 Made safe capital distributions Mar.29 Learned that Guthrie became personally insolvent Apr, 3 Paid all liabilities Jun. 30 Sold all inventory for 55,000 Jul. 1 Made safe capital distributions again Sep. 26 Paid liquidation expenses 15,000 Nov. 4 Made final cash distrubtions to the partners based on the assumption that all partners except Guthrie are personally solvent