TECH PKPRAJAPAT
TECH PKPRAJAPAT
Computer
Networks Questions & Answers – Access Networks
1. 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
View Answer
Answer: c
Explanation: A low-speed downstream channel
is not a constituent of a residential telephone line. But it might be just a
two-way telephone channel. Internet can be provided through a high-speed
downstream channel in a residential telephone line.
2. 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
View Answer
Answer: c
Explanation: DSL stands for Digital
Subscriber Line and ISP stands for Internet Service Provider. In a Digital
Subscriber Line system, the same company which provides phone connection is
also an ISP. The internet is provided through the pre-installed telephone
lines.
3. 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
View Answer
Answer: a
Explanation: DSLAM stands for Digital
Subscriber Line Access Multiplexer and it’s used by Telcos to convert the
analog signals to digital signals for the purpose of providing internet. The
DSLAM located in a telco’s Central Office does this function.
4. Which of the following terms is not
associated with DSL?
a) DSLAM
b) CO
c) Splitter
d) CMTS
View Answer
Answer: d
Explanation: CMTS stands for Cable modem
termination system. It is used in cable internet access. In cable internet
access, internet is not provided through telephone lines and the companies that
provide such connections don’t necessarily provide telephone access.
5. HFC contains _______
a) Fibre cable
b) Coaxial cable
c) A combination of Fibre cable and Coaxial
cable
d) Twisted Pair Cable
View Answer
Answer: c
Explanation: Hybrid fiber-coaxial (HFC) is a
telecommunications industry term for a broadband network that combines optical
fiber and coaxial cable. It has been popularly used since the early 1990s. It
is stronger than the optical fiber cables and faster than the co-axial cables.
6. Which of the following statements is not
applicable for cable internet access?
a) It is a shared broadcast medium
b) It includes HFCs
c) Cable modem connects home PC to Ethernet
port
d) Analog signal is converted to digital
signal in DSLAM
View Answer
Answer: d
Explanation: CMTS stands for Cable modem
termination system. In cable access analog signal is converted to digital
signal by CMTS. In cable internet access, internet is not provided through
telephone lines. DSLAM is used by Telecom companies.
7. Among the optical-distribution
architectures that are essentially switched ethernet is __________
a) AON
b) PON
c) NON
d) MON
View Answer
Answer:a
Explanation: AON stands for Active optical
networks which are essentially switched Ethernets. Each user has his/her own
dedicated optical fiber line connecting to the ISP in an AON.
8. StarBand provides __________
a) FTTH internet access
b) Cable access
c) Telephone access
d) Satellite access
View Answer
Answer: d
Explanation: StarBand was a two-way satellite
broadband Internet service available in the U.S. from 2000–2015. It was
discontinued from September 30 2015 due to increasing competition from other
ISPs.
9. Home Access is provided by __________
a) DSL
b) FTTP
c) Cable
d) All of the mentioned
View Answer
Answer: d
Explanation: Home Internet Access is provided
by DSL, FTTP, and Cable. FTTP provides the fastest speeds followed by the cable
connections and then the DSLs. FTTP is popularly used in modern connections.
10. ONT is connected to splitter using
_________
a) High speed fibre cable
b) HFC
c) Optical cable
d) Twisted pair cable
Answer: c
Explanation: ONT stands for Optical Network
Terminal. The ONT connects to the Termination Point (TP) with an optical fibre
cable. It translates light signals from the fibre optic line to electric
signals that the router can read.
11. Which of the following factors affect
transmission rate in DSL?
a) The gauge of the twisted-pair line
b) Degree of electrical interfernece
c) Shadow fading
d) The gauge of the twisted-pair line and
degree of electrical interference
Answer: d
Explanation: Because DSL is made of twisted
wire copper pair, the gauge of twisted pair line i.e. the protection and
electrical interference would affect the transmission rate in DSL. Unlike DSL,
FTTP is not really affected by these factors.
