Computer Networks Questions & Answers – Physical
Media
1. Which of this is not a guided
media?
a) Fiber optical cable
b) Coaxial cable
c) Wireless LAN
d) Copper wire
a) Fiber optical cable
b) Coaxial cable
c) Wireless LAN
d) Copper wire
Answer: c
Explanation: Wireless LAN is unguided media.
Explanation: Wireless LAN is unguided media.
2. UTP is commonly used in
__________
a) DSL
b) FTTP
c) HTTP
d) None of the mentioned
a) DSL
b) FTTP
c) HTTP
d) None of the mentioned
Answer: a
Explanation: Unshielded twisted pair(UTP) is commonly used in home access.
Explanation: Unshielded twisted pair(UTP) is commonly used in home access.
3. Coaxial cable consists of _______
concentric copper conductors.
a) 1
b) 2
c) 3
d) 4
a) 1
b) 2
c) 3
d) 4
Answer: b
Explanation: Coaxial cable has an inner conductor surrounded by a insulating layer, which is surrounded by a conducting shield. Coaxial cable is used to carry high frequency signals with low losses.
Explanation: Coaxial cable has an inner conductor surrounded by a insulating layer, which is surrounded by a conducting shield. Coaxial cable is used to carry high frequency signals with low losses.
4. Fiber optics posses following
properties __________
a) Immune electromagnetic interference
b) Very less signal attenuation
c) Very hard to tap
d) All of the mentioned
a) Immune electromagnetic interference
b) Very less signal attenuation
c) Very hard to tap
d) All of the mentioned
Answer: d
Explanation: In fibre optics the transmission of information is in the form of light or photons. Due to all above properties mentioned in options fibre optics can be submerged in water and are used at more risk environments.
Explanation: In fibre optics the transmission of information is in the form of light or photons. Due to all above properties mentioned in options fibre optics can be submerged in water and are used at more risk environments.
5. If an Optical Carrier is
represented as OC-n, generally the link speed equals(in Mbps) __________
a) n*39.8
b) n*51.8
c) 2n*51.8
d) None of the mentioned
a) n*39.8
b) n*51.8
c) 2n*51.8
d) None of the mentioned
Answer: b
Explanation: The base unit of transmission rates in optical fibre is 51.8 Mbits/s. So an optical carrier represented as OC-n has n*51.8 Mbits/s transmission speed. For eg. OC-3 has 3*51.8 Mbits/s speed.
Explanation: The base unit of transmission rates in optical fibre is 51.8 Mbits/s. So an optical carrier represented as OC-n has n*51.8 Mbits/s transmission speed. For eg. OC-3 has 3*51.8 Mbits/s speed.
6. Terrestrial radio channels are
broadly classifed into _____ groups.
a) 2
b) 3
c) 4
d) 1
a) 2
b) 3
c) 4
d) 1
Answer: b
Explanation: The three types are those that operate over very short distance, those that operate in local areas, those that operate in the wide area.
Explanation: The three types are those that operate over very short distance, those that operate in local areas, those that operate in the wide area.
.
7. Radio channels are attractive
medium because __________
a) Can penetrate walls
b) Connectivity can be given to mobile user
c) Can carry signals for long distance
d) All of the mentioned
a) Can penetrate walls
b) Connectivity can be given to mobile user
c) Can carry signals for long distance
d) All of the mentioned
Answer: d
Explanation: Radio channels can penetrate walls, can be used to provide connectivity to mobile users and can also carry signals for long distances.
Explanation: Radio channels can penetrate walls, can be used to provide connectivity to mobile users and can also carry signals for long distances.
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