Please help me with this Network Technology Study Guide!

1. The usual working estimate is that upgrading a network costs what percentage more than building it right the first time?

A) 10-20%

B)20-30%

C)50-80%

D)100%

2. The OC-192 standard operates at which of the following speeds?

A) 4 Gbps

B) 10 Gbps

C) 80 Gbps

D) 160 Gbps

3. The PSTN is an example of which type of network?

A) Star

B) Ring

C) Bus

D) Mesh

4. The _____ layer is the part of the network that connects the access layer to the rest of the network.

A) distribution

B) core

C) data link

D) network

5. the larger the _____ the greater the capacity of the wireless circuit and the faster data can be sent.

A) basic rate interface

B) frequency range

C) cloud architecture

D) bandwidth

6. which of the following is not a media access control method?

A) PCSM

B) DCF

C) PCF

D) SSID

7. Which of the following is designed to support wireless networking in both 2.4 GHz and 5 GHz ranges?

A) 802.11a

B) 802.11b

C) 802.11g

D) 802.11n

8. When IPsec is operating in ____ mode, only the message portion of the IP packet is encrypted.

A) transport

B) tunnel

C) mixed

D) virtual carrier-sense

9. How many separate channels does ADSL create over one local loop circuit?

A)1

B)2

C)3

D)4

10. Cable modems use ___ which requires users to compete with other users for available capacity.

A) local loop circuit

B) systems network architecture

C) shared multipoint circuits

D) very-high-data-rate DSL

11. Which of the following statements about deploying WAN is FALSE?

A) A key part of any successful wan deployment is testing.

B) Any time you have wide area links, at least two third parties are involved

C) With a phased approach, you can upgrade a network a little at a time.

D)Key components in connecting LANs might include a local connection device to the high-speed link, a high-speed carrier, and an ISP.

12. Which of the following has the highest relative cost?

A) X.25

B) ATM

C) Frame Relay

D) Ethernet