Expert Answers

Question 1. 1. (TCO1) The Central Office is the place: (Points : 5)
Where the operator makes connections.
Where all ISDN capabilities begin.
Where calls from subscribers are routed.
To connect the ADSL lines.
Question 2. 2. (TCO2) Like many softPBX systems, Asterisk refers to each leg of a voice call as a ____. (Points : 5)
Loop
SIP setup line
Channel
Ping
Question 3. 3. (TCO3) Known as ‘connectionless networking’, this protocol employs a method where IP datagram are sent over a network using a ‘best-effort’ approach. The recipient would not know if the packets sent were received by the intended recipient. (Points : 5)
UDP
TCP
ICMP
H.323
Question 4. 4. (TCO4) These are facility connections from the phone company switch to the residential analog telephones; or the term used for delivering dial-tone to a group of phones. (Points : 5)
Tip-ring
Lines
Trunks
Call links
Question 5. 5. (TCO5) Used by hackers to see vulnerabilities and gain access, it is a systematic process that attempts to identify all of the open and available services on a TCP/IP host. (Points : 5)
Firewall scan
DNS scan
Port scan
DMZ scan
Question 6. 6. (TCO6) This is a call accounting software that is retrieved from a PBX, where the incoming and outgoing call information are logged. The logged information can contain data as date, time, extension, trunk, caller ID, and duration of call. (Points : 5)
Call Database
SMDR
PBX log files
ACD
Question 7. 7. (TCO7) Along with CTI and ACD, this is a PBX supported application where multiple phones, telephony processes, phone operators, IVR, complex dial-plan, and hunt groups, run in a confined space and take information from customers, then, facilitate a response over the phone. (Points : 5)
Call Center
Auto Attendant
Intercom calling
Conferencing
Question 8. 8. (TCO10) This was the first VoIP standard, ratified by ITU-T in 1996, that addressed having real time communications for video and voice in an unreliable packet network, and applied for PBX-styled signaling that supports packet-based networks. (Points : 5)
SNMP
Megaco
H.323
SIP
Question 9. 9. (TCO11) This layer organizes and synchronizes dialogues between presentation entities in the OSI 7-Layer Communications Model, (Points : 5)
Data Link Layer
Transport Layer
Session Layer
Address of Destination
Question 10. 10. (TCO12) In Ethernet transmission, this is the result when two nodes transmit at the same time, which leads to data loss, re-transmission, delay, or latency. (Points : 5)
Error control
Termination
Collision
Multiple Station Access
Essay Questions (20 points each)
Question 1. 1. (TCO3) Name and explain the three most important factors that you must protect when Securing a VoIP Network.
Question 2. 2. (TCO4) What makes coaxial cable popular among broadband applications to customer premises? Discuss its advantages.
Question 3. 3. (TCO7) Out of CLECs, ILECs, and TSPs, which of these companies would use VoIP to offer voice services? Explain why.
Question 4. 4. (TCO10) Briefly explain the importance of a Gateway in the VoIP infrastructure.
Question 5. 5. (TCO5) How can it be determined if an ACD has been effective? What information would be provided from the ACD that would be viewed as valuable? List and define three reasons.
Question 6. (TCO6) What is a TMN? Discuss at least two Management Layers of TMN.
Question 7 (TCO8) What are the advantages and disadvantages of replacing a traditional PBX-type phone system with a Wireless IP phone?
Question 8 (TCO9) What role, if any does, VoIP play in terms of the call center space?
Question 9 (TCO11) Describe what a converged network is and what benefits are derived from that. Question 10 (TCO12) When deploying a VoIP system, what are some of the critical components that should be looked at in terms of assessing the environment for the readiness of a VoIP deployment?