What are some of the limitations of IPv4?
What will be an ideal response?
The Internet was initially designed primarily as a tool for researchers, scientists, and engineers to more easily exchange data and information with each other. At that time the types of data that IPv4 was created to carry were fairly simple: textual and numerical. Today, we require the IPv4 infrastructure to transmit much more complex types of data, including video, audio, graphics, and voice. IPv4 can do this, but not as efficiently as is desired or required in today's world of instant mass communications. The very popularity of IPv4 has also resulted in the rapid deletion of an essential element needed of any entity that wants an Internet presence, namely an IP address. IPv4 uses a two-level, and hierarchical, addressing scheme. Part of an IPv4's address is used as host, and part as network, as we discovered in an earlier chapter. IPv4 address classes are A, B, C, D, and E. This type of addressing scheme is not efficient for the numbers and types of networks now in place. IPv4 can be used to carry multimedia types of data, such as video and audio, but not very well. Multimedia types of data were never provided for in the IPv4 architecture because, at that time, such needs did not exist. Also, very importantly, IPv4 does not inherently provide for encryption and authentication, two technologies critical to securing the enterprise. The wireless revolution has been a resounding success. What is stalling this multi-billion dollar wireless revolution in its tracks, however, is the lack of IPv4 addressing. Wireless devices and the wireless LANs they run on must have IP addressing availability in order to fulfill their promise. Without an IP address, there is no connectivity. Workarounds using techniques such as Network Address Translation (NAT), subnetting and supernetting have helped extend IP addresses, but such techniques can only take IPv4 so far, and many countries outside of the United States and Europe were not part of the initial IP address giveaway. For these countries, the lack of IP addressing would mean literally having no Internet presence.
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Spark, Inc., which manufactures the fireworks that municipal governments buy to put on their annual fireworks shows on the Fourth of July, moved most of its manufacturing operations from the United States to China a decade ago. Now, Spark is moving production back to the United States because the company's managers are uncomfortable with many Chinese business practices. Spark, Inc. engages in __________ when it moves its operations back to the United States.
A. offshoring B. outsourcing C. reshoring D. globalizing E. countertrading
Which of the following emphasizes parts of sentences
A) parentheses B) em-dashes C) commas D) en-dashes
Maxine lost her job as an electrical engineer with a large company which had provided health insurance benefits for Maxine and her family. She now:
a. must try to find insurance on her own or try to find another job with health insurance benefits. b. is protected under COBRA, which allows her continued health insurance coverage for 18 months as long as she pays the cost. c. is protected under COBRA, which requires her employer to continue her health insurance coverage for six months under whatever copayment arrangements she had while she was employed. d. has some protection under the NLRA, which requires her employer to pay for continued health insurance for three months following her termination if she did not leave the company voluntarily.
A company purchased $10,000 of merchandise on January 5 with terms 2/10, n/30. On January 7, it returned $1,200 worth of merchandise. On January 12, it paid the full amount due. Assuming the company uses a perpetual inventory system, and records purchases using the gross method, the correct journal entry to record the payment on January 12 is:
A. Debit Accounts Payable $8,624; credit Cash $8,624. B. Debit Accounts Payable $10,000; credit Merchandise Inventory $200; credit Cash $9,800. C. Debit Cash $1,600; credit Accounts Payable $1,600. D. Debit Merchandise Inventory $8,800; credit Cash $8,800. E. Debit Accounts Payable $8,800; credit Merchandise Inventory, $176; credit Cash $8,624.