Multiple Choice Answers

1. (TCO 1) Identify the switching technology that organizes digital data in units of 53 bytes. (Points : 5)
Ethernet
LAN
WAN
ATM

2. (TCO 1) Indicate the protocol that is a major part of the VoIP solution and is frequently included in several implementations, such as central office switches and gateways. (Points : 5)

MEGACD/H.248
MIGACO/H.248
MEGECO/H.248
MEGACO/H.248

3. (TCO 2) Construct a 1.536 Mbps T1 link. (Points : 5)
24 Channels
32 Channels
Fractional Channels
CAS

4. (TCO 2) Choose the standard for describing multimedia content. (Points : 5)
MPEG2
MPEG3
MPEG4
MPEG7

5. (TCO 3) An MCU may control three different conference types; please identify them. (Points : 5)
Centralized, decentralized, mobile
Mobile, centralized, decentralized
Centralized, mobile, decentralized
Centralized, decentralized, mixed

6. (TCO 3) Identify the cause of packet delay. (Points : 5)
It is not the time it takes a packet to traverse the network.
It is the time it takes a packet to traverse a router.
It is the time it takes a packet to traverse the network.
It is the time it takes a packet to traverse a switch.

7. (TCO 4) Which of the following characteristics are not common to circuit-switched networks? (Points : 5)
Store and forward transmission
Dedicated bandwidth
Potentially wasted bandwidth
Each packet follows the same route

8. (TCO 4) Explain why G.711 is used in LANs. (Points : 5)
There is quite a bit of bandwidth in a LAN and it is not expensive.
There is not much bandwidth in a LAN and it is not expensive.
There is quite a bit of bandwidth in a LAN and it is expensive.
There is not much bandwidth in a LAN and it is expensive.

9. (TCO 4) Which of the following is not an advantage of packet switching? (Points : 5)
Performance drops when many users share the same network.
It is more efficient than circuit switching.
The network supports many connections simultaneously.
Short messages are not delayed by long messages.

10. (TCO 5) Discuss how DC is delivered over Ethernet. (Points : 5)
DC is delivered either on a signal pair or on an unused pair.
DC is delivered on a signal pair.
DC is delivered on an unused pair.
DC is delivered on a signal pair and on an unused pair.

11. (TCO 5) Select the IEEE standard that defines the application of power to IP telephones through the UTP wiring. (Points : 5)
802.3af
802.11
802.13
802.4ab

12. (TCO 6) Choose the videoconferencing standard that is engineered on networks, such as the Internet, that do not have QoS standard. (Points : 5)

QoS
H.323
IP
DHCP

13. (TCO 6) Identify a very weak encryption system that is sometimes used in wireless networks. (Points : 5)
WAP
TKIP
WEP
AES

14. (TCO 7) Assess what is needed to establish calls or multimedia sessions. (Points : 5)
Signaling protocols
New software
BIOS
New hardware

15. (TCO 7) Identify the characteristics of IP packets that carry voice. (Points : 5)
Are not affected by delay, loss, and retransmission
Are immune to delay, loss, and retransmission
Tend to create delay, loss, and retransmission
Are affected by delay, loss, and retransmission

16. (TCO 8) Identify the codec that introduces the least amount of packetization delay. (Points : 5)
G.711
G.723
G.611
G.721

17. (TCO 8) What is the maximum delay that is considered acceptable for voice traffic? (Points : 5)
250 ms
300 ms
100 ms
150 ms

18. (TCO 9) Identify the function of an SIP User Agent. (Points : 5)
An SIP User Agent places calls using IP address or e-mail-like addressing.
An SIP User Agent places calls using E.164 or IP address.
An SIP User Agent places calls using neither E.164 nor e-mail-like addressing.
An SIP User Agent places calls using E.164 or e-mail-like style.

19. (TCO 3) SNMP uses the ______ protocol to the Transport Layer. (Points : 5)
TCP
UDP
MIB
RTP

20. (TCO 5) 802.1X provides (Points : 5)
port-based access control.
a replacement for AES.
a supplement to VPNs.
increased speed over 802.11b.