CCNA1 Chapter 8 Practice Test Answers

 

Which layer of the OSI model is the physical layer?

  • Layer 1
  • Layer 2
  • Layer 3
  • Layer 4
  • Layer 5
  • Layer 6
  • Layer 7

 

What is the protocol data unit (PDU) at the physical layer?

 

  • Segment
  • Frame
  • Packet
  • Bits

 

Which tasks are the responsibility of the physical layer? (Choose 2)

 

  • Encoding data into signals and putting the signals on the medium.
  • Adding addressing information for the first hop of the journey.
  • Setting up an end-to-end communication across internetworks.
  • Specification of the cable characteristics.

 

What type of cable would you use to connect two PCs together directly?

 

  • Straight through
  • Crossover
  • Rollover
  • Console

 

What type of cable would you use to connect a PC to a switch or hub?

 

  • Straight through
  • Crossover
  • Rollover
  • Console

 

What type of cable would you use to connect a PC directly to a router?

 

  • Straight through
  • Crossover
  • Rollover
  • Console

 

What type of cable would you use to connect a switch to a router?

 

  • Straight through
  • Crossover
  • Rollover
  • Console

 

What type of cable would you use to connect a switch to another switch or to a hub (if no uplink ports are used)?

 

  • Straight through
  • Crossover
  • Rollover
  • Console

 

An RJ45 connector is typically used with:

 

  • Coaxial cable
  • Single mode Fibre optic cable
  • Multimode Fibre optic cable
  • Twisted pair cable

 

A type F connector is typically used with:

 

  • Coaxial cable
  • Single mode Fibre optic cable
  • Multimode Fibre optic cable
  • Twisted pair cable

 

In a standard UTP crossover cable, pins 1 and 2 cross with:

 

  • 3 and 4
  • 3 and 5
  • 3 and 6
  • 4 and 5
  • 4 and 6
  • 5 and 6

 

You look at the connectors at the ends of a standard UTP crossover cable (held the same way up). One end has an orange wire on the left. What colour should you see on the left at the other end?

 

  • Orange
  • Blue
  • Green
  • Brown

 

Which version of Ethernet uses Manchester encoding to put signals on a UTP cable?

 

  • 10Mbps legacy Ethernet
  • 100Mbps Fast Ethernet
  • 1000Mbps Gigabit Ethernet
  • 10Gbps Ethernet

 

Which version of Ethernet uses 4B/5B encoding to put signals on a UTP cable?

 

  • 10Mbps legacy Ethernet
  • 100Mbps Fast Ethernet
  • 1000Mbps Gigabit Ethernet
  • 10Gbps Ethernet

 

What protection does UTP cabling have against interference (EMI, RFI and crosstalk from other wires)?

 

  • The twisting gives a cancellation effect.
  • Metallic foil shielding round each pair of wires.
  • Metal mesh round the wires just inside the plastic jacket.
  • No protection at all.

 

Which of the following are disadvantages of choosing UTP cable for a network? (Choose 2)

 

  • It is more expensive than other types of cable.
  • It is more difficult to install than other types of cable.
  • It is more subject to interference than other types of cable.
  • It can be used only over relatively short distances.

 

Which of the following are advantages of choosing fibre optic cable for a network? (Choose 2)

 

  • It is the cheapest type of cable.
  • It is the easiest type of cable to install.
  • It does not have problems with RFI, RMI and crosstalk.
  • It can be used over long distances.
  • It is easier to obtain switches and network cards with the right sort of connections

 

Which types of cable have a braided metal shield inside the outer jacket? (Choose 2)

 

  • UTP
  • STP
  • Coaxial
  • Fibre optic

 

Which type of cabling typically uses lasers to put the signals on the medium?

 

  • Single mode fibre optic
  • Multimode fibre optic
  • Coaxial
  • STP

 

Which type of cabling typically uses light emitting diodes to put the signals on the medium?

 

  • Single mode fibre optic
  • Multimode fibre optic
  • Coaxial
  • STP

 

Which statement is true of single mode optical cabling?

 

  • It is normally cheaper than multimode.
  • It has a larger diameter core than multimode.
  • It has multiple light paths to give greater bandwidth.
  • It is suitable for long distances, up to 100 km.

 

What is the purpose of the cladding in a fibre optic cable?

 

  • It carries the light signals.
  • It prevents light from escaping from the core.
  • It provides strength and flexibility.
  • It cuts out RFI and EMI.

 

What would you find just inside the outer jacket of a fibre optic cable?

 

  • Cladding
  • Strengthening material
  • Buffer
  • Shielding

 

Which devices are most likely to cause problems for a wireless network? (Choose 2)

 

  • Microwave oven
  • Cordless phone
  • Computer workstation
  • Cable modem

 

Certain issues are more likely to give problems on a wireless network then on a cabled network, and need to be addressed when setting up the network. Which are these? (Choose 2)

 

  • Interference
  • Cost
  • Availability of equipment
  • Security

 

What is the common name for communication using the IEEE 802.15 standard to link paired devices over short distances?

 

  • Blackberry
  • Wi-fi
  • WiMAX
  • Bluetooth

 

Digital bandwidth is

 

  • The amount of information that could potentially flow across a network segment in a given amount of time, given the media and technologies in use.
  • The measured transfer of bits across the network media over a specified period of time.
  • The measured amount of usable data transferred between applications across a network over a specified period of time.
  • The rate of data flow across the slowest link in a network that uses several different layer 1 technologies.

 

Where in a LAN is fibre optic cable most likely to be used? (Choose 2)

 

  • For links between switch cabinets on different floors of a building.
  • For links between workstations and the wall network outlets.
  • For links between communications rooms in different buildings on a campus.
  • For links between workstations and hubs.