MULTI-CHOICE Transmission Media


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Question 1: An Ethernet network's repeaters are used to connect network segments at which level of the OSI model?
A: Physical
B: Data Link
C: Network
D: Transport

Question 2: The basic unit of information transported over a network is known as ..............  .
A: Frame
B: Datagram
C: Packet
D: None of the above

Question 3: What operating frequency(ies) is supported by wireless Ethernet LANs and bridges.
A: 900MHz
B: 1.9GHz
C: 2.4GHz
D: Both A and B
E: Both A and C

Question 4: Category 4 cable is ideal for which of the following LAN environments?
A: 10BaseT
B: 4 Mbps Token Ring
C: 16 Mbps Token Ring
D: Both A and B
E: Both A and C

Question 5: A few examples of the physical medium would include what?
A: UTP, coax, fibre optic cabling
B: PCs and printers
C: Routers and bridges
D: All of the above

Question 6: The ................... Layer is the lowest level of the OSI model.
A: Network
B: Physical
C: Transport
D: Data Link

Question 7: The term "Attenuation" of a signal  refers to:
A: The weakening of an electrical signal in UTP cabled network
B: The weakening of an electrical signal in a Co-axial cabled network
C: The loss of signal strength in a wireless transmission system
D: The radial dispersion from the central axis fibre network (FDDI)
D: All of the above


Question 8: The bandwidth of a communications channel is
A: The frequency that a signal is transmitted
B: The difference between the upper and lower frequency boundaries
C: The different frequency of light sources used in an FDDI
D: The addition of upper and lower frequency boundaries

Question 9: Multi-mode fibre optic refers to:
A: A light signal that travels along a single fibre without touching the sides
B: A  single light signal that travels along several fibres simultaneously
C: A light signal that is retained within a single fibre by total internal reflection
D: Several different light signals being multiplexed within a single cable


Question 10: The light source used for the transmission in a fibre optic can be:
A: A light emitting diode (LED)
B: A  Laser (Light Amplification by stimulated Emission of Radiation)
C: A Halogen lamp
D: Both A and B
E: Both A and C
F: Both C and B

Question 11: The effect of Electromagnetic Interference (EMI) is 
A: The unwanted induction between different wires within the same sheath of a UTP cable
B: Interference induced into a copper cable running close to a transformer.
C: Electromagnetic interference induced into a fibre cable running close to a motor
D: A and C
E: A and B
F: All of the above


Question 12: Which of the following are NOT examples of Data Terminal Equipment (DTE)

a)Dumb Terminal
b)Network Interface Card (NIC)
c)Modem
d)Automatic Cash Dispensor (ATM)
e)Printer
f) Coder-decoder (CODEC)
g) Intelligent workstation

A: A and G
B: B and C
C: A and B
D: C and F
E: D and G
F: E and C

Question 13: Which of the following are examples of Data Communications Equipment (DCE)

a)Electronic Point of Sale (EPOS)
b)Network Interface Card (NIC)
c)Modem
d)Automatic Cash Dispensor (ATM)
e)Printer
f)Coder-decoder (CODEC)
g)Intelligent workstation

A: A and C
B: F and G
C: B and D
D: E and G
E: C and F
F: B and E

Question 14 A router is a device that
A: Discards packets who's header instructions contain errors
B: Removes any errors or distortions then repeats them without amplification
C: Regenerates the signal to the original strength without removing errors and distortion
D: All of the above

Question 15 A repeater is a hub that
A: Returns packets to the host if the header instructions contain errors
B: Removes any errors or distortions then repeats them without amplification
C: Regenerates the signal to the original strength without removing errors and distortion
D: All of the above


If you scored more than 75% you appear to have a good understanding of basic transmission principles. If you scored less than 60% you need to carry out further research in this area.

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