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Section A: Network Basics (10 Questions)

1. A local area network (LAN) is defined by _______________

a) The geometric size of the network b) The maximum number of hosts in the network c) The maximum number of hosts in the network and/or the geometric size of the network d) The topology of the network

2. The TCP/IP protocol suite consists of _______ layers.

a) Two b) Four c) Five d) Six

3. In the TCP/IP protocol suite, which of the following is an application layer protocol?

a) The User Datagram Protocol (UDP) b) The Internet Protocol (IP) c) The File Transfer Protocol (FTP) d) The Transmission Control Protocol (TCP)

4. In the TCP/IP protocol suite, which of the following is a transport layer protocol?

a) The Internet Control Message Protocol (ICMP) b) The Internet Protocol (IP) c) The Address Resolution Protocol (ARP) d) The Transmission Control Protocol (TCP)

5. In the TCP/IP protocol suite, which of the following is a network layer protocol?

a) The Stream Control Transmission Protocol (SCTP) b) The Secure Shell (SSH) c) The Internet Protocol (IP) d) User Datagram Protocol (UDP)

6. In the TCP/IP protocol suite, the ______ layer is responsible for moving frames from one hop (node) to the next.

a) Physical b) Data link c) Transport d) Network

7. The transport-layer packet in the TCP/IP protocol suite is called

a) A message b) A datagram c) A segment or a user datagram d) A frame

8. In the TCP/IP protocol suite, a port number is the identifier at the ____________.

a) Application layer b) Transport layer c) Network layer d) Physical layer

9. The _________ layer is responsible for the delivery of a message from one process to another.

a) Physical b) Transport c) Network d) Application

10. The Internet Protocol (IP) is ________ protocol.

a) A reliable b) A connection-oriented c) A reliable and connection-oriented d) An unreliable

Section B: Network Management & Wireless Networks (10 Questions)

11. We can define network management as ________________ network components to meet a set of requirements defined by an organization.

a) Monitoring b) Configuring c) Testing and troubleshooting d) All of the above

12. The ___________ management system must know, at any time, the status of each entity and its relation to other entities.

a) Configuration b) Fault c) Accounting d) Performance

13. The ___________ management system monitors and controls the network to ensure that it is running as efficiently as possible.

a) Configuration b) Fault c) Accounting d) Performance

14. The ___________ management system is responsible for controlling access to the network based on the pre-defined policy.

a) Configuration b) Fault c) Security d) Performance

15. Under __________ management, individual users, departments, divisions, or even projects are charged for the services they receive from the network.

a) Configuration b) Accounting c) Security d) Performance

16. In IEEE 802.11, distributed coordination function (DCF) uses _______ as the access method.

a) CSMA/CA b) CSMA/CD c) ALOHA d) None of the choices are correct

17. In IEEE 802.11, the ______ is a time period used for collision avoidance.

a) NAV b) BSS c) ESS d) None of the choices are correct

18. The original IEEE 802.11 uses _________.

a) FHSS b) DSSS c) OFDM d) Either FHSS or DSSS

19. The IEEE 802.11a uses _________.

a) FHSS b) DSSS c) OFDM d) Either FHSS or DSSS

20. In ______ each station is assigned a code; using a special coding scheme, stations send data over the entire bandwidth of the channel without having to share the capacity in frequency or time with other stations.

a) FDMA b) TDMA c) CDMA d) None of the choices are correct

Section C: Voice over IP (VoIP) (10 Questions)

21. Which of the following is NOT considered a VoIP protocol?

a) SIP b) SS7 c) H.225 call signaling d) H.225 RAS e) All of the above

22. Which of the following factors influence voice quality in VoIP calls?

a) Bandwidth b) Latency c) Codec support d) The type of echo cancellation in use e) All of the above

23. When call quality issues present themselves on a VoIP connection, which of the following factors point to possible VoIP issues?

a) One party can talk but not hear the other party, or they can hear but not talk b) Sound distortions such as taps, clicks, pops or high-pitched squeals occur c) Audio drop-outs occur at irregular intervals during the call d) An echo occurs often with a significant (half a second or more) delay e) All of the above

24. What is the bandwidth minimum that most experts recommend for good VoIP call signal quality?

a) 16 Kbps b) 56 Kbps c) 90 Kbps d) 256 Kbps e) None of the above

25. Which of the following statements represents the most accurate definition for the mean opinion score (MOS) used to grade perceived call quality for VoIP?

a) An average value for call quality based on a three-point scale of poor, fair and good b) An average value for call quality based on bandwidth sampling at 10-second intervals throughout the call c) An average value based on a five-point scale (1–5), where 1 indicates communication is impossible and 5 is like face-to-face interaction d) An average value based on a seven-point scale (0–6), where 0 indicates no communication and 7 is face-to-face interaction e) None of the above

26. For which of the following metrics does MOS play NO role?

a) To compare service from multiple VoIP providers b) To assess the relative efficacy of codecs c) To determine the impact of latency on call quality d) To compare voice delivery over different kinds of networks e) All of the above

27. Which of the following network characteristics is most commonly associated with an echo on a VoIP connection?

a) Connection latency b) Packet queue delay c) Signal capture and regeneration from link to link d) Propagation delay e) None of the above

28. Which of the following switch or router capabilities can help improve VoIP call quality on a LAN?

a) Use MPLS to speed general traffic handling b) Enforce Quality of Service (QoS) policies that give preferential treatment to VoIP packets c) Use Differentiated Services (DiffServ) to give preferential treatment to VoIP packets d) Use pre-emptive packet drop techniques to limit packet delays for VoIP traffic e) All of the above

29. Choose the best genuine advantages for a modern general VoIP office handset.

a) Easy phone access to email b) Better than POTS call quality c) Support for unified communications (UC) to email, voicemail, instant messaging, video chat, and more d) Automatic access to POTS when Internet access fails

30. What kind of circuitry is used in VoIP to convert analog voice to digital signals for transmission, and digital signals to analog voice for playback?

a) Audio codec b) Digital signal processor (DSP) c) Digital-to-analog converter (DAC) d) Analog-to-digital converter (ADC) e) None of the above

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