Kamis, 20 Oktober 2011

Take Assessment - ENetwork Chapter 8 - CCNA Exploration 1: Network Fundamentals (Version 4.0) [Oktober 2011]

1. Which OSI layer is responsible for binary transmission, cable specification, and physical aspects of network communication?

  • Presentation 
  • Transport 
  • Data Link 
  • Physical

2. An installed fiber run can be checked for faults, integrity, and the performance of the media by using what device? 
  • light injector 
  • OTDR 
  • TDR 
  • multimeter
Refer to the exhibit. Which type of Category 5 cable is used to make an Ethernet connection between Host A and Host B? 
  • coax cable 
  • rollover cable 
  • crossover cable 
  • straight-through cable
4. Which fiber connector supports full duplex Ethernet?
  •  option 3

 5. With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs? 
  • the magnetic field around the adjacent pairs of wire 
  • the use of braided wire to shield the adjacent wire pairs 
  • the reflection of the electrical wave back from the far end of the cable 
  • the collision caused by two nodes trying to use the media simultaneously
6. Which method of signal transmission uses radio waves to carry signals? 
  • electrical 
  • optical 
  • wireless 
  • acoustic
7. In most business LANs, which connector is used with twisted-pair networking cable? 
  • BNC 
  • RJ-11 
  • RJ-45 
  • Type F
8. Which of the following is a characteristic of single-mode fiber-optic cable? 
  • generally uses LEDs as the light source 
  • relatively larger core with multiple light paths 
  • less expensive than multimode 
  • generally uses lasers as the light source
9. Which type of cable run is most often associated with fiber-optic cable? 
  • backbone cable 
  • horizontal cable 
  • patch cable 
  • work area cable
10. What are three measures of data transfer? (Choose three.) 
  • goodput 
  • frequency 
  • amplitude 
  • throughput 
  • crosstalk 
  • bandwidth
11. What is considered a benefit of wireless as a media choice? 
  • more host mobility 
  • lower security risks 
  • reduced susceptibility to interference 
  • less impact of the surroundings on the effective coverage area
12. What is a primary role of the Physical layer in transmitting data on the network? 
  • create the signals that represent the bits in each frame on to the media 
  • provide physical addressing to the devices 
  • determine the path packets take through the network 
  • control data access to the media
13. In LAN installations where potential electrical hazards or electromagnetic interference may be present, what type of media is recommended for backbone cabling? 
  • coax 
  • fiber 
  • Cat5e UTP 
  • Cat6 UTP 
  • STP
14. Which characteristics describe fiber optic cable? (Choose two.) 
  • It is not affected by EMI or RFI. 
  • Each pair of cables is wrapped in metallic foil. 
  • It combines the technique of cancellation, shielding and twisting to protect data. 
  • It has a maximum speed of 100 Mbps. 
  • It is the most expensive type of LAN cabling.
15. What is a possible effect of improperly applying a connector to a network cable? 
  • Data will be forwarded to the wrong node. 
  • Data transmitted through that cable may experience signal loss. 
  • An improper signaling method will be implemented for data transmitted on that cable. 
  • The encoding method for data sent on that cable will change to compensate for the improper connection.
16. When is a straight-through cable used in a network? 
  • when connecting a router through the console port 
  • when connecting one switch to another switch 
  • when connecting a host to a switch 
  • when connecting a router to another router
17. What characteristic of UTP cable helps reduce the effects of interference? 
  • the metal braiding in the shielding 
  • the reflective cladding around core 
  • the twisting of the wires in the cable 
  • the insulating material in the outer jacket

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