quiz 1.txt

这是 ssd8 exam1 的选择题 比较全 感兴趣的 朋友 可以 参考一下

1. 	
	Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination 	

	(a) in the order A-B, after having traversed the same route
(b) in any order, after possibly having traversed different routes
(c) in any order, after having traversed the same route
(d) in the order A-B, after possibly having traversed different routes

	Correct answer is 	(b)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.2 of the course notes. 	

	2. 	
	All store-and-forward networks are 	

	(a) packet or message switched networks
(b) broadcast networks
(c) connectionless networks
(d) connection-based networks

	Correct answer is 	(a)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	3. 	
	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) A is smaller than B
(b) B is smaller than A
(c) B and A are not related
(d) B is equal to A

	Correct answer is 	(a)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.4 of the course notes. 	

	4. 	
	Which of the following parameters can be specified in the header of a request in the Hypertext Transfer Protocol (HTTP)?

   1. The types of image formats that a browser understands
   2. The type of browser (e.g., Netscape, Internet Explorer) making the request
   3. The method by which the request is to be satisfied—for example, whether the request is a GET of a form submission

	

	(a) III only
(b) I, II, and III
(c) I and II only
(d) II and III only

	Correct answer is 	(b)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	5. 	
	A computer sends 100 Kbytes of aggregate data to another computer through the network. If this transmission time takes 10 seconds and setup time is negligible, the throughput of this network is 	

	(a) not able to be determined with the information given
(b) in the range from 60 to 120 Kbps (kilobits per second)
(c) exactly 10 Kbps
(d) in the range from 6 to 12 Kbps (kilobits per second)

	Correct answer is 	(b)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.4 of the course notes. 	

	6. 	
	You have recently become the first network engineer of a large corporation with offices worldwide. The company is considering the installation of a data network, but the Board of Directors is rather old-fashioned and does not see the need to change the company's time-honored business practices. Your first task at the job is to justify your salary and the cost of a new network, and for this purpose you are about to give a presentation to the Board of Directors. Which of the following would you include in your presentation? Assume the directors are extremely intelligent, though perhaps not knowledgeable in your field.

   1. Lower expenditures on computer hardware
   2. Higher availability of customer services
   3. Better protection of the company's proprietary information

	

	(a) II only
(b) I and III only
(c) I and II only
(d) II and III

	Correct answer is 	(c)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1 of the course notes. 	

	7. 	
	Why do network applications send "messages," but the network transmits information in "packets?"

   1. Buffer allocation and error handling is easier when done for smaller chunks of data.
   2. Multiple messages can be sent in a single large packet to decrease overhead.
   3. Network engineers and application programmers just use different terminology for the same unit of application data.
   4. A message needs to be packaged with the instructions to process it at the destination.

	

	(a) I and II only
(b) II and III only
(c) I, II, III, and IV
(d) II and IV only

	Correct answer is 	(a)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	8. 	
	Which of the following are specified by the HTTP protocol?

   1. The syntax of the request header
   2. The syntax of the response header
   3. The specific legal names of the request header fields

	

	(a) I and II only
(b) I, II, and III
(c) I only
(d) I and III only

	Correct answer is 	(a)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	9. 	
	The Internet received its name in the 1980s because 	

	(a) it was meant to be a network internal to the United States Department of Defense
(b) it consisted of many interconnected networks
(c) it achieved international scope with the addition of the City University of London
(d) it was an interim (temporary) design of what it later became, but the name stuck

	Correct answer is 	(b)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.6 of the course notes. 	

	10. 	
	The Protocol Data Unit (PDU) that is sent by a protocol layer to its peer on the destination system typically includes

   1. A payload
   2. A protocol header
   3. A router vendor ID

	

	(a) I and III only
(b) I, II, and III
(c) II only
(d) I and II only

	Correct answer is 	(d)

	Your score on this question is: 	10.00



. 	
	Why do network applications send "messages," but the network transmits information in "packets?"

   1. Buffer allocation and error handling is easier when done for smaller chunks of data.
   2. Multiple messages can be sent in a single large packet to decrease overhead.
   3. Network engineers and application programmers just use different terminology for the same unit of application data.
   4. A message needs to be packaged with the instructions to process it at the destination.

	

	(a) I, II, III, and IV
(b) II and III only
(c) II and IV only
(d) I and II only

	Correct answer is 	(d)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	2. 	
	Which of the following methods are invoked by a server implemented with sockets?

   1. connect( )
   2. listen( )
   3. accept( )

	

	(a) II only
(b) II and III only
(c) I, II, and III
(d) III only

	Correct answer is 	(b)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	3. 	
	Two packets A and B are sent in that order through a connection-oriented communication network. They could arrive at the destination 	

	(a) only in the order A-B, after possibly having traversed different routes
(b) in any order, after having traversed the same route
(c) only in the order A-B, after having traversed the same route
(d) in any order, after possibly having traversed different routes

	Correct answer is 	(c)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.2 of the course notes. 	

	4. 	
	The Maximum Transfer Unit (MTU) is a parameter of 	

	(a) the operating system
(b) the size of data sent by the application
(c) the application protocol
(d) the technology of the physical network

	Correct answer is 	(d)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	5. 	
	Which of the following activities use an inter-network?

   1. A phone call from Pittsburgh in the United States to Chennai in India
   2. A phone call from a wired phone to a mobile ("cell") phone
   3. A chat session between two computers connected to an office Ethernet

	

	(a) III only
(b) I only
(c) I and II only
(d) I, II, and III

	Correct answer is 	(c)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.6 of the course notes. 	

	6. 	
	_____ can be used to measure latency in the communication network. 	

	(a) Roundtrip time
(b) Throughput
(c) Percentage of packets retransmitted
(d) Bit Error Rate

	Correct answer is 	(a)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.4 of the course notes. 	

	7. 	
	What can be said concerning the protocol that is used by the implementation of the network layer of an Internet host?

   1. It guarantees delivery.
   2. It is the Internet Protocol (IP).
   3. It uses services provided by the session layer.

	

	(a) none
(b) I and II only
(c) II only
(d) I only

	Correct answer is 	(c)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.5 of the course notes. 	

	8. 	
	Which of the following parameters can be specified in the header of a request in the Hypertext Transfer Protocol (HTTP)?

   1. The types of image formats that a browser understands
   2. The type of browser (e.g., Netscape, Internet Explorer) making the request
   3. The method by which the request is to be satisfied—for example, whether the request is a GET of a form submission

	

	(a) I, II, and III
(b) III only
(c) II and III only
(d) I and II only

	Correct answer is 	(a)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	9. 	
	In a broadcast network 	

	(a) only the computers that are tuned to a channel see and process the packets in that channel
(b) only the destination computer sees a packet
(c) all computers see and process the application data within all packets
(d) all computers see all packets, but the application data in each packet is only processed by the destination computer

	Correct answer is 	(d)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	10. 	
	We send a packet from host A to host B, which immediately acknowledges it. We measure the interval between the time the packet is sent by A and its acknowledgement is received. This interval is found to be 180 milliseconds. What can be said about the latency of the link from A to B? 	

	(a) It is smaller than 180 ms.
(b) It is exactly 180 ms.
(c) It is greater than 180 ms.
(d) It is exactly 90 ms.

	Correct answer is 	(a)

	Your score on this question is: 	0.00

1. 	
	The Protocol Data Unit (PDU) that is sent by a protocol layer to its peer on the destination system typically includes

   1. A payload
   2. A protocol header
   3. A router vendor ID

	

	(a) I and III only
(b) I and II only
(c) I, II, and III
(d) II only

	Correct answer is 	(b)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.5 of the course notes. 	

	2. 	
	Packet collisions occur in an Ethernet network because 	

	(a) the Ethernet uses a ring topology
(b) two different Ethernet networks may be spliced together
(c) the Ethernet switching mechanism may occasionally send two packets through the same route
(d) two Ethernet nodes can send packets at the same time

	Correct answer is 	(d)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.2 of the course notes. 	

	3. 	
	The Maximum Transfer Unit (MTU) is a parameter of 	

	(a) the size of data sent by the application
(b) the operating system
(c) the technology of the physical network
(d) the application protocol

	Correct answer is 	(c)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	4. 	
	Which of the following are specified by the HTTP protocol?

   1. The syntax of the request header
   2. The syntax of the response header
   3. The specific legal names of the request header fields

	

	(a) I and II only
(b) I, II, and III
(c) I only
(d) I and III only

	Correct answer is 	(a)

	Your score on this question is: 	0.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	5. 	
	Which of the following methods are invoked by a server implemented with sockets?

   1. connect( )
   2. listen( )
   3. accept( )

	

	(a) III only
(b) II and III only
(c) I, II, and III
(d) II only

	Correct answer is 	(b)

	Your score on this question is: 	10.00

	Feedback: 	
   See section 1.1.1 of the course notes. 	

	6. 	
	An application on a computer sends data through a socket to another computer. Which of the following are specified by the communication protocol?

   1. The contents of the message body
   2. The speed of transmission
   3. The header format, which specifies the header field sizes and meanings

	

	(a) I only
(b) II and III only
(c) I and III only
(d) III only

	Correct answer is 	(d)

	Your score on this question is: 	0.00

	Feedback: