CCNA1 v6.0 Chapter 4 Exam 2018

Chapter 4: Network Access

To support our communication, the OSI model divides the functions of a data network into layers. Each layer works with the layers above and below to transmit data. Two layers of the OSI model are so closely tied, that according to the TCP/IP model they are in essence one layer. Those two layers are the data link layer and the physical layer.

On the sending device, it is the role of the data link layer to prepare data for transmission and control how that data accesses the physical media. However, the physical layer controls how the data is transmitted onto the physical media by encoding the binary digits that represent data into signals.

On the receiving end, the physical layer receives signals across the connecting media. After decoding the signal back into data, the physical layer passes the frame to the data link layer for acceptance and processing.

This chapter begins with the general functions of the physical layer and the standards and protocols that manage the transmission of data across local media. It also introduces the functions of the data link layer and the protocols associated with it.

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CCNA1 v6.0 Chapter 4 Exam

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1. Answered
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1. Question 1 of 24

   1. Question

   2 points

   What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)

    

   • to reduce the number of collisions on the media
   • to distinguish data bits from control bits
   • to provide better media error correction
   • to identify where the frame starts and ends
   • to increase the media throughput
   Correct
   

   Incorrect
   
2. Question 2 of 24

   2. Question

   1 points

   What is indicated by the term throughput?

    

   • the guaranteed data transfer rate offered by an ISP
   • the capacity of a particular medium to carry data
   • the measure of the usable data transferred across the media
   • the measure of the bits transferred across the media over a given period of time
   • the time it takes for a message to get from sender to receiver
   Correct
   

   Incorrect
   
3. Question 3 of 24

   3. Question

   2 points

   A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)

    

   • EMI
   • crosstalk
   • RFI
   • signal attenuation
   • extended length of cabling
   Correct
   

   Incorrect
   
4. Question 4 of 24

   4. Question

   1 points

   Which characteristic describes crosstalk?

    

   • the distortion of the network signal from fluorescent lighting
   • the distortion of the transmitted messages from signals carried in adjacent wires
   • the weakening of the network signal over long cable lengths
   • the loss of wireless signal over excessive distance from the access point
   Correct
   

   Incorrect
   
5. Question 5 of 24

   5. Question

   1 points

   What technique is used with UTP cable to help protect against signal interference from crosstalk?

    

   • twisting the wires together into pairs
   • wrapping a foil shield around the wire pairs
   • encasing the cables within a flexible plastic sheath
   • terminating the cable with special grounded connectors
   Correct
   

   Incorrect
   
6. Question 6 of 24

   6. Question

   1 points

   Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?

   

    

   • 1 – rollover, 2 – crossover, 3 – straight-through
   • 1 – rollover, 2 – straight-through, 3 – crossover
   • 1 – crossover, 2 – straight-through, 3 – rollover
   • 1 – crossover, 2 – rollover, 3 – straight-through
   Correct
   

   Incorrect
   
7. Question 7 of 24

   7. Question

   1 points

   Refer to the exhibit. What is wrong with the displayed termination?

   

    

   • The woven copper braid should not have been removed.
   • The wrong type of connector is being used.
   • The untwisted length of each wire is too long.
   • The wires are too thick for the connector that is used.
   Correct
   

   Incorrect
   
8. Question 8 of 24

   8. Question

   1 points

   Which type of connector does a network interface card use?

    

   • DIN
   • PS-2
   • RJ-11
   • RJ-45
   Correct
   

   Incorrect
   
9. Question 9 of 24

   9. Question

   1 points

   What is one advantage of using fiber optic cabling rather than copper cabling?

    

   • It is usually cheaper than copper cabling.
   • It is able to be installed around sharp bends.
   • It is easier to terminate and install than copper cabling.
   • It is able to carry signals much farther than copper cabling.
   Correct
   

   Incorrect
   
10. Question 10 of 24

    10. Question

    1 points

    Why are two strands of fiber used for a single fiber optic connection?

     

    • The two strands allow the data to travel for longer distances without degrading.
    • They prevent crosstalk from causing interference on the connection.
    • They increase the speed at which the data can travel.
    • They allow for full-duplex connectivity.
    Correct
    

    Incorrect
    
11. Question 11 of 24

    11. Question

    3 points

    A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.)

     

    • mobility options
    • security
    • interference
    • coverage area
    • extensive cabling
    • packet collision
    Correct
    

    Incorrect
    
12. Question 12 of 24

    12. Question

    1 points

    Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

     

    • application
    • transport
    • data link
    • physical
    Correct
    

    Incorrect
    
13. Question 13 of 24

    13. Question

    2 points

    What are two services performed by the data link layer of the OSI model? (Choose two.)

     

    • It encrypts data packets.
    • It determines the path to forward packets.
    • It accepts Layer 3 packets and encapsulates them into frames.
    • It provides media access control and performs error detection.
    • It monitors the Layer 2 communication by building a MAC address table.
    Correct
    

    Incorrect
    
14. Question 14 of 24

    14. Question

    1 points

    What is true concerning physical and logical topologies?

     

    • The logical topology is always the same as the physical topology.
    • Physical topologies are concerned with how a network transfers frames.
    • Physical topologies display the IP addressing scheme of each network.
    • Logical topologies refer to how a network transfers data between devices.
    Correct
    

    Incorrect
    
15. Question 15 of 24

    15. Question

    1 points

    Which method of data transfer allows information to be sent and received at the same time?

     

    • full duplex
    • half duplex
    • multiplex
    • simplex
    Correct
    

    Incorrect
    
16. Question 16 of 24

    16. Question

    1 points

    Which statement describes an extended star topology?

     

    • End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
    • End devices are connected together by a bus and each bus connects to a central intermediate device.
    • Each end system is connected to its respective neighbor via an intermediate device.
    • All end and intermediate devices are connected in a chain to each other.
    Correct
    

    Incorrect
    
17. Question 17 of 24

    17. Question

    1 points

    Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit?

    

     

    • All three networks use CSMA/CA
    • None of the networks require media access control.
    • Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.
    • Network 1 uses CSMA/CA and Network 2 uses CSMA/CD.
    • Network 2 uses CSMA/CA and Network 3 uses CSMA/CD.
    Correct
    

    Incorrect
    
18. Question 18 of 24

    18. Question

    1 points

    What is contained in the trailer of a data-link frame?

     

    • logical address
    • physical address
    • data
    • error detection
    Correct
    

    Incorrect
    
19. Question 19 of 24

    19. Question

    1 points

    As data travels on the media in a stream of 1s and 0s how does a receiving node identify the beginning and end of a frame?

     

    • The transmitting node inserts start and stop bits into the frame.
    • The transmitting node sends a beacon to notify that a data frame is attached.
    • The receiving node identifies the beginning of a frame by seeing a physical address.
    • The transmitting node sends an out-of-band signal to the receiver about the beginning of the frame.
    Correct
    

    Incorrect
    
20. Question 20 of 24

    20. Question

    1 points

    What is the function of the CRC value that is found in the FCS field of a frame?

     

    • to verify the integrity of the received frame
    • to verify the physical address in the frame
    • to verify the logical address in the frame
    • to compute the checksum header for the data field in the frame
    Correct
    

    Incorrect
    
21. Question 21 of 24

    21. Question

    1 points

    Fill in the blank.

    • The term (bandwidth, BANDWIDTH) indicates the capacity of a medium to carry data and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).
    Correct
    

    Incorrect
    
22. Question 22 of 24

    22. Question

    1 points

    Fill in the blank.

    • What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame? (LLC, llc)
    Correct
    

    Incorrect
    
23. Question 23 of 24

    23. Question

    1 points

    Fill in the blank.

    • A physical topology that is a variation or combination of a point-to-point, hub and spoke, or mesh topology is commonly known as a (hybrid, HYBRID) topology.
    Correct
    

    Incorrect
    
24. Question 24 of 24

    24. Question

    6 points

    Match the characteristics to the correct type of fiber. (Not all options are used.)

    

     

    Sort elements

    • 1. LED as light source
    • 2. several paths of light into the fiber
    • 3. generally used with LANs
    • 4. only one ray of light into the fiber
    • 5. generally used for campus backbone
    • 6. laser as light source

    • Multimode Fiber

    • Multimode Fiber

    • Multimode Fiber

    • Single-mode Fiber

    • Single-mode Fiber

    • Single-mode Fiber

    Correct
    

    Incorrect