1. Which OSI layer is responsible for binary transmission, cable specification, and physical aspects of network communication?
• Data Link
2. An installed fiber run can be checked for faults, integrity, and the performance of the media by using what device?
• light injector
• 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.
4. 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 router5. 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
6. Which method of signal transmission uses radio waves to carry signals?
• Type F8. 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 cable10. What are three measures of data transfer? (Choose three.)
11. 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 simultaneously12. 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?
• Cat5e UTP
• Cat6 UTP
14. 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.
• Options three is right answer (kolmas)
16. 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
• 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