ssd8 exam1 exam1 11

View Assessment Result Assessment Name: Exam 1 Multiple-Choice -------------------------------------------------------------------------------- 1. How does an operating system identify the application to which data coming in from the network should be relayed? (a) Only one application at a time is given access to the network. (b) By the file extension of the data (c) By the protocol with which the data was sent (d) By the port number carried by the transport protocol Correct answer is (d) Your score on this question is: 6.67 Feedback: See section 1.1.1 of the course notes. -------------------------------------------------------------------------------- 2. Ethernet (IEEE 802.3) is an example of (a) a de facto standard later developed into a de jure standard (b) a successful example of the Internet's strategy of developing standards through "rough consensus and running code" (c) an a priori standard (d) a standard developed by the International Telecommunications Union Correct answer is (a) Your score on this question is: 0.00 Feedback: See section 1.1.6 of the course notes. -------------------------------------------------------------------------------- 3. Which of the following pairs of entities name a client and one of its servers? Google search engine/www.example.com Web browser/Google search engine Email client/Web browser (a) I, II, and III (b) II only (c) II and III only (d) I and II only Correct answer is (d) Your score on this question is: 6.67 Feedback: See section 1.1.1 of the course notes. -------------------------------------------------------------------------------- 4. An advantage of defining network protocols through agreement among many companies and individuals is that (a) different implementations can then communicate with each other (b) otherwise source code would need to be shipped with all networking applications (c) a protocol designed by committee always has better performance than that designed by a single company or research project (d) only one implementation need then be created Correct answer is (a) Your score on this question is: 0.00 Feedback: See section 1.1.1 of the course notes. (b) The specification of a proprietary protocol need not be released, and can be released without releasing the source code. -------------------------------------------------------------------------------- 5. The throughput of a network link for an HTTP session is measured in two ways. Measurement A is the total amount of data received by the browser, divided by the duration of the session. Measurement B is the total amount of data received by the operating system on behalf of the browser, divided by the duration of the session. Which of the following statements about A and B is true? (a) B is smaller than A (b) B is equal to A (c) B and A are not related (d) A is smaller than B Correct answer is (d) Your score on this question is: 6.67 Feedback: See section 1.1.4 of the course notes. -------------------------------------------------------------------------------- 6. A parity code is a(n) (a) error-correcting code (b) fair resource allocation scheme (c) duplex transmission technique (d) error-detecting code Correct answer is (d) Your score on this question is: 6.67 Feedback: See section 1.2.2 of the course notes. -------------------------------------------------------------------------------- 7. When the data link layer applies "framing" to the data to be transmitted, it (a) inserts flags to draw attention to high-priority data within a transmission (b) adds the protocol headers from higher layers to the data before it transmits it (c) cuts out the headers from higher layer protocols before transmission (d) enhances it with extra data that permits the receiver to synchronize with the sender Correct answer is (d) Your score on this question is: 0.00 Feedback: See section 1.2.2 of the course notes. -------------------------------------------------------------------------------- 8. In contrast with wireless communication, "wired" communication does not suffer from attenuation and interference can use any frequencies without a license always has more throughput (a) I, II, and III (b) I and III only (c) none (d) II only Correct answer is (d) Your score on this question is: 0.00 Feedback: See section 1.2.1 of the course notes. -------------------------------------------------------------------------------- 9. In contrast to message switching, packet switching needs to find a "copper" path to the receiver before transmitting any data offers a better upper bound on transmission delay suffers from greater overhead at the endpoints (a) II and III only (b) I and III only (c) II only (d) I and II only Correct answer is (a) Your score on this question is: 0.00 Feedback: See section 1.2.3 of the course notes. -------------------------------------------------------------------------------- 10. The point-to-point (PPP) protocol can only be used in analog dial-up connections is a data-link protocol can only be used to carry IP over serial lines (a) II and III only (b) III only (c) II only (d) I and II only Correct answer is (c) Your score on this question is: 6.67 Feedback: See section 1.2.5 of the course notes. -------------------------------------------------------------------------------- 11. The IP address space is organized in a hierarchy to make the routing task more scalable to decrease inefficient fragmentation of the address space to give institutions managing local-area networks autonomous control over the assignment of addresses to computers (a) II only (b) none (c) I and III only (d) I only Correct answer is (c) Your score on this question is: 6.67 Feedback: See section 1.3.3 of the course notes. -------------------------------------------------------------------------------- 12. In contrast to the Address Resolution Protocol (ARP), the Domain Name System (DNS) (a) is not used to find hosts within a LAN (b) can use the same algorithm on all physical network technologies (c) caches values (d) is not used to find host addresses Correct answer is (b) Your score on this question is: 0.00 Feedback: See section 1.3.5 of the course notes. (a) Both DNS and ARP are often used to find local hosts. -------------------------------------------------------------------------------- 13. You have just connected a newly purchased computer to your LAN. Eagerly, you boot it for the first time and find with great disappointment that the machine will not be able to use the network because of an IP address conflict. How did the computer find the conflict? (a) It sent an IP packet to its own IP address and did not receive any IP packets within a timeout period. (b) It sent an ARP packet to the local broadcast address and received a reply. (c) It sent an Ethernet frame to its own Ethernet address, and some other machine responded. (d) It sent a packet to 127.0.0.0 and did not receive any replies. Correct answer is (b) Your score on this question is: 6.67 Feedback: See section 1.3.5 of the course notes. -------------------------------------------------------------------------------- 14. Which of the following routing algorithms is the most scalable? (a) Datagram broadcast