61. Which of this is not a constituent of residential telephone line?
a) A high-speed downstream channel
b) A medium-speed downstream channel
c) A low-speed downstream channel
d) An ultra-high speed downstream channel
Answer: c
62. DSL telcos provide which of the following services?
a) Wired phone access
b) ISP
c) Wired phone access and ISP
d) Network routing and ISP
Answer: c.
63. The function of DSLAM is to
a) Convert analog signals into digital signals
b) Convert digital signals into analog signals
c) Amplify digital signals
d) De-amplify digital signals
Answer: a
64. How many layers are present in the Internet protocol stack (TCP/IP model)?
a) 5
b) 7
c) 6
d) 10
Answer: a
65. The number of layers in ISO OSI reference model is
a) 5
b) 7
c) 6
d) 10
Answer: b.
66. Which of the following layers is an addition to OSI model when compared with TCP IP model?
a) Application layer
b) Presentation layer
c) Session layer
d) Session and Presentation layer COMPUTER NETWORKS ( UNIT 1)
4
Answer: d
67. Application layer is implemented in
a) End system
b) NIC
c) Ethernet
d) Packet transport
Answer: a
68. Transport layer is implemented in
a) End system
b) NIC
c) Ethernet
d) Signal transmission
Answer: a
69. The functionalities of the presentation layer include
a) Data compression
b) Data encryption
c) Data description
d) All of the mentioned Answer: d
70. The physical layer is concerned with
a) bit-by-bit delivery
p) process to process delivery
c) application to application delivery
d) port to port delivery
Answer: a
71. Which transmission media provides the highest transmission speed in a network?
a) coaxial cable
b) twisted pair cable
c) optical fiber
d) electrical cable
Answer: c.
72. Bits can be sent over guided and unguided media as analog signal by
a) digital modulation
b) amplitude modulation
c) frequency modulation
d) phase modulation
Answer: a
73. The portion of physical layer that interfaces with the media access control sublayer is called
a) physical signalling sublayer
b) physical data sublayer
c) physical address sublayer
d) physical transport sublayer
Answer: a
74. The physical layer provides
a) mechanical specifications of electrical connectors and cables
b) electrical specification of transmission line signal level
c) specification for IR over optical fiber
d) all of the mentioned Answer: d
75. In asynchronous serial communication the physical layer provides
a) start and stop signaling
b) flow control
c) both start & stop signaling and flow control
d) only start signaling
Answer: c
 Questions | PDF | Quiz To test your Knowledge 1000 MCQs | Geekforgeeks.in){kind=link}
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