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31 Cards in this Set
- Front
- Back
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Why is a large, busy network more likely to use dynamic routing? |
Because dynamic routing automatically selects the most efficient route between nodes, reducing the possibility for human error. |
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A packet on a network using the RIP routing method has been passed from one connectivity device to another 15 times. What happens when it gets passed to one more device? |
It is discarded. |
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What element of the PTSN is most likely capable of transmitting only analog signals? |
Local Loop |
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Which WAN topology comes with the highest availability and the greatest cost? |
Full mesh |
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A customer calls your ISP's tech support line, complaining that he usually gets 128 Kbps, but only if getting 64 Kbps today. He has rebooted it three times with the same result. What type of connection does this customer have? |
Integrated Services Digital Network |
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What is the purpose of ISDN's D channel? |
To carry call session information. |
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Suppose you work for a bank and you are leasing a frame relay connection to link an automatic teller machine located in a rural grocery store with your bank's headquarters. What circuit would provide the best service for users of this ATM? |
SVC |
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What layer of the OSI does the WAN technology Asynchronous Transfer Mode operate at? |
The Data Link layer |
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What layer of the OSI does Digital Subscriber Line operate at? |
The physical layer |
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Which layer of the OSI does the Synchronous Optical Network (SONET) WAN technology operate at? |
The physical layer. |
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Three employees have a desktop computer and want to share the single broadband cable internet connection that comes to their office. Where do you install a router on their network? |
Between the cable modem and the workstations. |
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How does Asynchronous Transfer Mode (ATM) differ from every other WAN technology? |
It uses fixed-size cells to carry data. |
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If your company wants to order ADSL from its local telecommunications carrier, and you call the carrier and find out that your office is located 17k feet from the nearest CO, what is the maximum downstream throughput you can realistically expect to achieve through this connection? |
2 Mbps |
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What technique does T1 technology use to transmit multiple signals over a single telephone line? |
Time division multiplexing |
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The science museum where you work determines that it needs an Internet connection capable of transmitting and receiving data at 12 Mbps at any time. Which of the following T-carrier solutions would you advise? |
Ten T1s |
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What is the maximum capacity of a T1 circuit? |
1.5 Mbps |
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What is the maximum capacity of a T3 circuit? |
44.736 Mbps |
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What part of a Synchronous Optical Network (SONET) network allows it to be self-healing? |
Its double-ring topology |
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What is not an example of a broadband transmission? |
Ethernet |
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What kind of cable uses BNC connectors? F-connectors? Which connector is likely to be used by cable TV? |
Coaxial cable, coaxial cable, f-connector |
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What categories of twisted pair cable can support Gigabit Ethernet? |
Cat 5e and higher |
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What is the earliest twisted pair cabling standard that meets the minimum requirements for 10GBase-T transmissions? |
Cat 6 |
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What device can boost an analog signal? A digital signal? |
Amplifier, repeater |
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What is twist ratio and why is it important? |
Twist ratio is the number of twists per meter or foot. The more twists per for in a pair of wires, the more resistant the pair will be to cross-talk or noise. |
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What characteristic of optical transmissions is primarily responsible for the distance limitations of fiber-optic cabling? |
Optical loss, the degradation of the light signal after it travels a certain distance away from its source. |
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Why is Single-mode fiber (SMF) more efficient over long distances than Multi-mode fiber (MMF)? |
The core of SMF is much narrower than that of MMF, and reflects very little. The light does not disperse as much along the fiber. |
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The _______ is a device that connects workstations to local area networks and retransmits the incoming frame? |
Hub |
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The _______ allows workstations to connect to LANs and interconnects multiple segments is LANs. |
Switch |
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A _________ is a device that interconnects two local area networks and can use processing power to direct a frame out a particular port, thus reducing the amount of traffic on the network. |
Switch |
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A ________ not only includes raw data, but also the sender's and receiver's network addresses and control information. |
Frame |
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A ________ is a connectivity device that operates at the Physical layer and repeats digital signals over a network segment. |
Hub |
