19.2 Java4620r-review  (Page 3/3)

Question 24

True or False?

Although the distinction between client and server is becoming less clear each day, there is one fundamental distinction that is inherent in the Javaprogramming language.

The server initiates conversations with clients, while clients block and wait for a server to initiate a conversation.

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What is the meaning of the following two images?

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Answers

Answer 24

False.

Although the distinction between client and server is becoming less clear each day, there is one fundamental distinction that is inherent in the Javaprogramming language.

The client initiates conversations with servers, while servers block and wait for a client to initiate a conversation.

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Answer 23

True.

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Answer 22

True.

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Answer 21

False.

Java provides at least two different approaches for doing network programming (and possibly more) , insofar as the web is concerned. The two approaches are associated with

• The Socket , DatagramSocket , and ServerSocket classes
• The URL, URLEncoder, and URLConnection classes.

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Answer 20

True.

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Answer 19

True.

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Answer 18

False. A proxy server is often used to improve the communication speed of computers inside of a company with the Internet at largeoutside the company. For example, if ten people inside the company attempt to connect to the same Internet server and download the same web page within a (hopefully) short period of time, that page may be saved on the proxy server on the first attempt and then delivered to the next nine people withoutre-acquiring it from the outside web server. This can significantly improve delivery time and reduce network traffic into and out of the company.

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Answer 17

False. A firewall is the common name given to the equipment and associated software that is used to insulate the network inside of a company from theInternet at large outside the company. Typically, the firewall will restrict the degree to which computers inside the company can communicate with the Internetfor security and other reasons.

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Answer 16

True.

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Answer 15

True.

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Answer 14

False. The Domain Name System (DNS) was developed to translate between IP addresses and domain names. Whenever you log your browser onto the internet and attempt to connect to a server using its domainname, the browser first communicates with a DNS server to learn the corresponding numeric IP address. The numeric IP address (and not the domain name) is encapsulated into the data packets and used by the internet protocol to route those packets from thesource to the destination.

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Answer 13

True.

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Answer 12

True.

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Answer 11

True.

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Answer 10

False. The User Datagram Protocol ( UDP) is often referred to as an unreliable protocol because there is no guarantee that a series of packets will arrive in the right order, or that they willarrive at all.

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Answer 9

True.

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Answer 8

True.

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Answer 7

True.

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Answer 6

False. IP is an acronym that stands for Internet Protocol.

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Answer 5

True.

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Answer 4

False. In order for two or more computers connected to a network to be able to exchange data in an orderly manner, they must adhere to a mutually acceptablecommunication protocol. The protocol defines the rules by which they communicate.

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Answer 3

True.

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Answer 2

False. Each of the devices on the network can be thought of as a node , and each node has a unique address.

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Answer 1

True.

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Miscellaneous

This section contains a variety of miscellaneous information.

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