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Code d'Examen: CN0-201
Nom d'Examen: CompTIA (CompTIA CTP+ Certification Exam)
Questions et réponses: 302 Q&As
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NO.1 Which of the following is an audio data compression algorithm for voice that compresses digital voice
in packets of 10 milliseconds duration?
A. G.711
B. H.320
C. H.323
D. G.729
Answer: D
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NO.2 H.323 is a group of protocols defined by the International Telecommunication Union for multimedia
conferences over Local Area Networks. H.323 uses ASN.1 binary code. Which of the following layers of
the OSI model is responsible for translating, processing, and reading ASN.1 and ASCII messages?
A. Transport layer
B. Application layer
C. Physical layer
D. Presentation layer
Answer: D
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NO.3 When a phoneislifted off-hook, it connects the two wires causing an electrical signal to flowfromthe
phone exchange to thephone. What is this electrical signal called?
A. Off-hook signal
B. Ground start signal
C. Loop start signal
D. On-hook signal
Answer: C
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NO.4 Which of the following statements are true about session hijacking?
Each correct answer represents a complete solution. Choose all that apply.
A. Use of a long random number or string as the session key reduces session hijacking.
B. It is used to slow the working of victim's network resources.
C. TCP session hijacking is when a hacker takes over a TCP session between two machines.
D. It is the exploitation of a valid computer session to gain unauthorized access to information or services
in a computer system.
Answer: ACD
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NO.5 Which of the following are examples of interactive communication?
Each correct answer represents a complete solution. Choose all that apply.
A. Video Conferencing
B. E-mail
C. Fax
D. Phone call
Answer: AD
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NO.6 Which of the following ITU standards specifies PCM voice coding at 64 kbps?
A. G.726
B. G.728
C. G.729
D. G.711
Answer: D
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NO.7 Rick, an administrator of a TCP/IP network, wants to achieve the following goals: l Reduce congestion
of network traffic. l Optimize the utilization of the IP address space.
Which of the following technologies may help him to accomplish the task?
A. Pinging
B. Supernetting
C. Routing
D. Subnetting
Answer: D
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NO.8 You have just set up a wireless network for customers at a coffee shop. Which of the following are
good security measures to implement?
Each correct answer represents a complete solution. Choose two.
A. Not broadcasting SSID
B. MAC filtering the router
C. Using WEP encryption
D. Using WPA encryption
Answer: CD
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NO.9 Which of the following devices is used to make decisions based on MAC addresses and is considered
the most appropriate device to use when limiting broadcast domains for devices that will process voice
data?
A. Layer 3 switch
B. Repeater
C. Layer 2 switch
D. MCU
Answer: C
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NO.10 Which of the following protocols is used by VoIP applications for communication initiation in the
network?
A. TLS
B. NTP
C. SIP
D. SSH
Answer: C
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NO.11 Andrewis working for a television station in NorthAmerica and South America. What video standardis
more possibly be used with the video stored in the archives of these stations?
A. PAL
B. NTSC
C. SECAM
D. IEEE 1394
Answer: B
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NO.12 Voice over IP is an application that requires efficient use of bandwidth and reliability. VoIP must not
suffer the delays that can be seen at times with Web sites and Web applications. Which technology can
be used to help ensure the efficient transport of VoIP traffic?
A. RTP
B. QoS
C. DNS
D. RSTP
Answer: B
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NO.13 Which of the following is a mechanism used by the Multimedia Extensions (WME) standard to avoid
contentions in a particular traffic category?
A. Sliding Window Protocol
B. Contention Window (CW)
C. Auto-Rate Fallback
D. Maximum Segment Size (MSS)
Answer: B
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NO.14 Adam works as a Sales Engineer for Umbrella Inc. One of his customers complains that the PBX is
getting reset several times in a day. Adam finds that the power LEDs of PBX are fluttering. He suspects
that faulty power supply is the cause of this problem. Which of the following troubleshooting tools should
Adam use to verify these suspicions?
A. Continuity tester
B. Line tester
C. Volt meter
D. T-BERD 4000
Answer: C
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NO.15 Which of the following are endpoints in Cisco Unified Communications?
Each correct answer represents a complete solution. Choose two.
A. Switches
B. Routers
C. Gateways
D. IP phones
Answer: CD
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NO.16 You work as a network consultant for Net World International. You are designing a network for a client
company. The proposed network will use a class B address for its network. The network will be divided
into thirty-two subnets. Which of the following subnet masks will you use to design the network?
A. 255.255.252.0
B. 255.252.0.0
C. 255.255.248.0
D. 255.248.0.0
Answer: A
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NO.17 Which of the following layers of the OSI model managescommunication between
communicationentities in a network?
A. Presentation
B. Network
C. Transport
D. Session
E. Application
Answer: D
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NO.18 Which of the following devices is used to create VLANs in a small network?
A. Repeater
B. Switch
C. Hub
D. Bridge
Answer: B
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NO.19 Youwork as a NetworkAdministrator for McNeil Inc.Thecompany hasa TCP/IP-based network.
Performance of the network is slow because of heavy traffic.A hub is used as a central connectingdevice
in the network. Which of the following devices can be used in place of a hub to control thenetwork traffic
efficiently?
A. Repeater
B. Router
C. Switch
D. Bridge
Answer: C
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NO.20 Which of the following protocols provides sequence numbers to VoIP packets?
A. TCP
B. RTP
C. UDP
D. SCCP
Answer: B
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