Q&A Hero

Q: An Active Directory domain ________. A) has only a single domain controller B) makes all servers domain controllers C) must have its servers organized as a tree D) none of the above

Q: Which of the following is used to query a directory server to get someone's e-mail address? A) LDAP B) IMAP C) SNMP D) HTTP

Q: Directory servers organize information in a ________. A) mesh B) hierarchy C) relational database D) all of the above

Q: Message units are a time and distance pricing method that can be used to charge for local calls.

Q: Local calls are always billed on a flat rate basis where the customer pays a monthly fee for unlimited local calling.

Q: Even for local calls, many telephone companies charge by the duration of the call.

Q: Call restriction refers to a switch's ability to control incoming calls to a station.

Q: Incompatibilities between signaling systems in United States and Europe cause serious problems.

Q: ATM provides quality-of-service for voice.

Q: In TDM, there are usually more frames than slots.

Q: Deregulation is the least for ________. A) customer premises equipment B) local telephone service C) long-distance telephone service D) All of the above are deregulated to about the same degree.

Q: Deregulation is the highest for ________. A) customer premises equipment B) local telephone service C) long-distance telephone service D) All of the above are deregulated to about the same degree.

Q: Within a LATA, ILECs and CLECs interconnect at ________. A) access points B) NAPs C) POPs D) IXCs

Q: ICCs provide telephone transmission service ________. A) within LATAs B) between LATAs C) between different countries D) all of the above

Q: In the United States, ________ handle long-distance communication. A) ILECs B) IXCs C) ICCs D) PTTs

Q: In the United States, IXCs provide telephone transmission service ________. A) within a LATA B) between LATAs C) between the United States and another country D) all of the above

Q: In the United States, which of the following is a carrier? A) ILEC B) LATA C) both A and B D) neither A nor B

Q: In the United States, telephone customers can connect to a(n) ________ carrier to receive telephone service. A) ILEC B) CLEC C) either A or B D) neither A nor B

Q: Which of the following provide(s) overall regulations for the U.S. carriers in the United States? A) FCC B) PUCs C) neither A nor B

Q: Which of the following regulates telephony within individual states in the United States? A) FCC B) PUCs C) neither A nor B

Q: Which of the following was set up primarily to provide long-distance telephone service after the breakup of the Bell System in the early 1980s? A) AT&T B) RBOCs C) both A and B D) neither A nor B

Q: A ________ provides telephone service to customers. A) PTT B) Ministry of Telecommunications C) both A and B D) neither A nor B

Q: PTTs were found in ________. A) Europe B) United States C) both A and B D) neither A nor B

Q: Which of the following is an advanced carrier telephone service? A) voice mail B) caller ID C) both A and B D) neither A nor B

Q: Which of the following would a mail order company's customers prefer? A) 900 number service B) 800 number service C) WATS service D) They would have no preference among these choices.

Q: With WATS calls, the ________ pays and pays ________ per minute than direct distance dialing. A) caller, more B) caller, less C) called party, more D) called party, less

Q: With 900 numbers, the ________ pays and pays ________ per minute than direct distance dialing. A) caller, more B) caller, less C) called party, more D) called party, less

Q: With 888 numbers, the ________ pays and pays ________ per minute than direct distance dialing. A) caller, more B) caller, less C) called party, more D) called party, less

Q: For PBXs, call detail reporting is ________. A) a user service B) an attendant service C) a management service

Q: For PBXs, nighttime calling is ________. A) a user service B) an attendant service C) a management service

Q: For PBXs, call forwarding is ________. A) a user service B) an attendant service C) a management service

Q: For PBXs, camp-on is ________. A) a user service B) an attendant service C) a management service

Q: For PBXs, call transfer is ________. A) a user service B) an attendant service C) a management service

Q: Which of the following is NOT one of the three categories of PBX services? A) attendant services B) management services C) advanced services D) user services

Q: Plenum wiring is needed for ________. A) heavy traffic loads B) safety C) both A and B D) neither A nor B

Q: In data wiring, there need to be four wires for each computer on the floor in ________. A) horizontal distribution B) vertical distribution C) both A and B D) neither A nor B

Q: In telephone wiring, there need to be four wires for each computer on the floor in ________. A) horizontal distribution B) vertical distribution C) both A and B D) neither A nor B

Q: Cross-connect devices are found in ________. A) PBXs B) equipment rooms C) telecommunications closets D) switches

Q: Which of the following have an altitude of a few thousand kilometers (a few thousand miles)? A) GEOs B) LEOs C) MEOs D) none of the above

Q: Which of the following is good for mobile stations? A) GEOs B) LEOs C) both A and B D) neither A nor B

Q: Satellite ________ operate on a point-to-point basis. A) uplinks B) downlinks C) both A and B D) neither A nor B

Q: Because of the curvature of the earth, microwave systems that must travel over long distances need ________. A) to operate at low frequencies B) to operate at high frequencies C) repeaters D) mirrors

Q: PSTN signaling in the United States uses ________. A) SS7 B) ATM C) TDM D) SIP

Q: ________ is/are widely used in Europe for PSTN signaling. A) C7 B) SS7 C) both A and B D) neither A nor B

Q: Which of the following is packet-switched? A) ATM B) TDM C) both A and B D) neither A nor B

Q: SONET/SDH applies ________ when there is a break in a trunk line between switches. A) the Spanning Tree Protocol B) wrapping C) half-duplex transmission D) full-duplex transmission

Q: SONET/SDH uses a ________ topology. A) point-to-point B) hierarchy C) mesh D) ring

Q: A ring topology is attractive because it brings ________. A) higher speed B) lower cost C) greater reliability D) all of the above

Q: In TDM, a voice conversation gets the same ________ in each ________. A) frame, packet B) packet, frame C) frame, slot D) slot, frame

Q: In TDM, time is first divided into brief periods called ________. A) packets B) frames C) slots D) cells

Q: Frequency modulation uses two loudness levels.

Q: In QAM, if you have eight possible amplitudes, how many bits can you send per clock cycle? A) 3 B) 6 C) 8 D) 16

Q: In QAM, if you have eight possible amplitudes, you have ________ possible states. A) 4 B) 8 C) 16 D) none of the above

Q: In QAM, if you have four possible amplitudes, you have ________ possible states. A) 4 B) 8 C) 16 D) none of the above

Q: QAM uses ________ levels. A) loudness B) frequency C) both A and B D) neither A nor B

Q: QAM uses ________. A) amplitude modulation B) phase modulation C) both A and B D) neither A nor B

Q: QPSK sends ________ bit(s) per clock cycle. A) 1 B) 2 C) 4 D) 16

Q: QPSK modulation uses ________ phases. A) 2 B) 4 C) 8 D) 15

Q: BPSK modulation uses two ________. A) amplitudes B) frequencies C) phases D) none of the above

Q: BPSK uses ________ phase levels. A) 2 B) 4 C) 8 D) 15

Q: Phase modulation uses two ________ levels. A) loudness B) frequency C) wave D) none of the above

Q: Amplitude modulation uses two ________ levels. A) loudness B) frequency C) both A and B

Q: A TCP segment carries data octets 456 through 980. The following TCP segment is a supervisory segment carrying no data. What value is in the sequence number field of the latter TCP segment? A) 456 B) 457 C) 980 D) 981

Q: A TCP segment begins with octet 8,658 and ends with octet 12,783. What number does the receiving host put in the acknowledgment number field of the TCP segment that acknowledges this TCP segment? A) 8,658 B) 8,659 C) 12,783 D) 12,784

Q: A TCP segment begins with octet 8,658 and ends with octet 12,783. What number does the sending host put in the sequence number field? A) 8,658 B) 8,659 C) 12,783 D) 12,784

Q: Flow control in TCP depends on the ________ field. A) acknowledgement number B) window size C) both A and B D) neither A nor B