Cn_rev
- 1.
PDUs at the Network layer of the OSI are called what?
- A.
Transport
- B.
Frames
- C.
Packets
- D.
Segments
Correct Answer
C. PacketsExplanation
C. Protocol Data Units are used to define data at each layer of the OSI model. PDUs at the Network
layer are called packets.Rate this question:
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- 2.
Which fields are contained within an IEEE Ethernet frame header? (Choose two.)
- A.
Source and destination MAC address
- B.
Source and destination network address
- C.
Source and destination MAC address and source and destination network address
- D.
FCS field
Correct Answer(s)
A. Source and destination MAC address
D. FCS fieldExplanation
A, D. An Ethernet frame has source and destination MAC addresses, an Ether-Type field to
identify the Network layer protocol, the data, and the FCS field that holds the result of the CRC.Rate this question:
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- 3.
What is the maximum data rate for 802.11b wireless LANs?
- A.
2Mbps
- B.
10Mbps
- C.
11Mbps
- D.
54Mbps
Correct Answer
C. 11MbpsExplanation
C. 802.11b, also called “Wi-Fi,” has a maximum data rate of 11Mbps.Rate this question:
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- 4.
Segmentation of a data stream happens at which layer of the OSI model?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
D. TransportExplanation
D. The Transport layer receives large data streams from the upper layers and breaks these up
into smaller pieces called segments.Rate this question:
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- 5.
Which of the following describe router functions? (Choose four.)
- A.
Packet switching
- B.
Collision prevention
- C.
Packet filtering
- D.
Broadcast domain enlargement
- E.
Internetwork communication
- F.
Broadcast forwarding
- G.
Path selection
Correct Answer(s)
A. Packet switching
C. Packet filtering
E. Internetwork communication
G. Path selectionExplanation
A, C, E, G. Routers provide packet switching, packet filtering, internetwork communication,
and path selection.Rate this question:
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- 6.
Which layer of the OSI provides translation of data?
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Data Link
Correct Answer
B. PresentationExplanation
. The only layer of the OSI model that can change data is the Presentation layer.Rate this question:
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- 7.
When data is encapsulated, which is the correct order?
- A.
Data, frame, packet, segment, bit
- B.
Segment, data, packet, frame, bit
- C.
Data, segment, packet, frame, bit
- D.
Data, segment, frame, packet, bit
Correct Answer
C. Data, segment, packet, frame, bitExplanation
C. The encapsulation method is: data, segment, packet, frame, bit.Rate this question:
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- 8.
Why does the data communication industry use the layered OSI reference model? (Choose two.)
- A.
It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
- B.
It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
- C.
It supports the evolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers.
- D.
It encourages industry standardization by defining what functions occur at each layer of the model.
- E.
It provides a framework by which changes in functionality in one layer require changes in other layers.
Correct Answer(s)
A. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
D. It encourages industry standardization by defining what functions occur at each layer of the model.Explanation
A, D. The main advantage of a layered model is that it can allow application developers to
change aspects of a program in just one layer of the layer model’s specifications. Advantages of
using the OSI layered model include, but are not limited to, the following: It divides the network
communication process into smaller and simpler components, thus aiding component development,
design, and troubleshooting; allows multiple-vendor development through standardization
of network components; encourages industry standardization by defining what functions
occur at each layer of the model; allows various types of network hardware and software to
communicate; and prevents changes in one layer from affecting other layers, so it does not hamper
development.Rate this question:
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- 9.
What are two purposes for segmentation with a bridge?
- A.
Add more broadcast domains.
- B.
Create more collision domains.
- C.
Add more bandwidth for users.
- D.
Allow more broadcasts for users.
- E.
Reduce collisions within a broadcast domain.
- F.
Increase the number of collision domains.
Correct Answer(s)
B. Create more collision domains.
C. Add more bandwidth for users.Explanation
B, C. Bridges break up collision domains, which allows more bandwidth for users.Rate this question:
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- 10.
Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet?
- A.
Half-duplex Ethernet operates in a private collision domain.
- B.
Half-duplex Ethernet has higher effective throughput.
- C.
Half-duplex Ethernet has lower effective throughput.
- D.
Half-duplex Ethernet operates in a private broadcast domain.
- E.
Half-duplex Ethernet operates in a shared collision domain.
Correct Answer(s)
C. Half-duplex Ethernet has lower effective throughput.
E. Half-duplex Ethernet operates in a shared collision domain.Explanation
A, D. Unlike full duplex, half-duplex Ethernet operates in a shared collision domain, and it has
a lower effective throughput then full duplex.Rate this question:
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- 11.
You want to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?
- A.
Thicknet coax
- B.
Thinnet coax
- C.
Category 5 UTP cable
- D.
Fiber optic cable
Correct Answer
D. Fiber optic cableExplanation
D. Fiber optic cable provides a more secure, long-distance cable that is not susceptible to EMI
interference at high speeds.Rate this question:
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- 12.
Acknowledgements, sequencing, and flow control are characteristic of which OSI layer?
- A.
Layer 2
- B.
Layer 3
- C.
Layer 4
- D.
Layer 7
Correct Answer
C. Layer 4Explanation
C. A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted
and received reliably. A reliable connection is defined by a virtual circuit that uses
acknowledgments, sequencing, and flow control, which are characteristics of the Transport
layer (layer 4).Rate this question:
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- 13.
Which of the following are types of flow control?
- A.
Buffering
- B.
Cut-through
- C.
Windowing
- D.
Congestion avoidance
- E.
VLANs
Correct Answer(s)
A. Buffering
C. Windowing
D. Congestion avoidanceExplanation
A, C, D. The common types of flow control are buffering, windowing, and congestion avoidance.Rate this question:
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- 14.
Which of the following types of connections can use full duplex? (Choose three.)
- A.
Hub to hub
- B.
Switch to switch
- C.
Host to host
- D.
Switch to hub
- E.
Switch to host
Correct Answer(s)
B. Switch to switch
C. Host to host
E. Switch to hostExplanation
B, C, E. Hubs cannot run full-duplex Ethernet. Full duplex must be used on a point-to-point
connection between two devices capable of running full duplex. Switches and hosts can run full
duplex between each other.Rate this question:
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- 15.
Which of the following describes a MAC address? (Choose two.)
- A.
It is a globally unique IP address.
- B.
It is a unique address in a broadcast domain.
- C.
It is provided by the manufacturer of the NIC.
- D.
It is used as part of the IPX/SPX configuration.
- E.
Is is a logical address.
Correct Answer(s)
C. It is provided by the manufacturer of the NIC.
E. Is is a logical address.Explanation
C, D. A MAC address is 6 bytes long (48 bits) and is burned into the NIC card by the manufacturer.
IPX, when it was still used, used the MAC address as part of the configuration.Rate this question:
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- 16.
Which of the following are considered some reasons for LAN congestion? (Choose six.)
- A.
Bill Gates
- B.
Low bandwidth
- C.
Too many users in a broadcast domain
- D.
Broadcast storms
- E.
Routers
- F.
Multicasting
- G.
The addition of hubs to the network
- H.
Large amount of ARP or IPX traffic
Correct Answer(s)
B. Low bandwidth
C. Too many users in a broadcast domain
D. Broadcast storms
F. Multicasting
G. The addition of hubs to the network
H. Large amount of ARP or IPX trafficExplanation
B, C, D, F, G, H. Although Bill Gates is a good answer for me, the answers are: not enough
bandwidth, too many users, broadcast storms, multicasting, adding hubs for connectivity to the
network, and a large amount of ARP or IPX traffic.Rate this question:
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- 17.
Which of the following are reasons for breaking up a network into two segments with a router? (Choose two.)
- A.
To create fewer broadcast domains
- B.
To create more broadcast domains
- C.
To create one large broadcast domain
- D.
To stop one segment’s broadcasts from being sent to the second segment
Correct Answer(s)
B. To create more broadcast domains
D. To stop one segment’s broadcasts from being sent to the second segmentExplanation
17. B, D. Routers, by default, break up broadcast domains, which means that broadcasts sent on
one network would not be forwarded to another network by the router.Rate this question:
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- 18.
How does a host on an Ethernet LAN know when to transmit after a collision has occurred?
- A.
The destination host sends a request to the source for retransmission.
- B.
The jam signal indicates that the collision has been cleared.
- C.
The hosts will attempt to resume transmission after a time delay has expired.
- D.
An electric pulse indicates that the collision has cleared.
- E.
The router on the segment will signal that the collision has cleared.
Correct Answer
C. The hosts will attempt to resume transmission after a time delay has expired.Explanation
18. C. Once transmitting stations on an Ethernet segment hear a collision, they send an extended
jam signal to ensure that all stations recognize the collision. After the jamming is complete, each
sender waits a predetermined amount of time, plus a random time. After both timers expire, they
are free to transmit.Rate this question:
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- 19.
You want to use full-duplex Ethernet instead of half duplex. Which two of the following will be benefits on your network?
- A.
You will have more collision domains.
- B.
You’ll have no collisions on each segment.
- C.
It should be faster.
- D.
It will be less expensive.
Correct Answer(s)
B. You’ll have no collisions on each segment.
C. It should be faster.Explanation
19. B, C. No collision on a point-to-point full-duplex Ethernet segment should occur, and fullduplex
Ethernet should be faster then half-duplex Ethernet.Rate this question:
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- 20.
You have the following MAC address: C9-3F-32-B4-DC-19. What is the OUI portion in binary?
- A.
11000110-11000000-00011111
- B.
1100110000111111-00011000
- C.
11001001-00111111-00110010
- D.
11001100-01111000-00011000
Correct Answer
C. 11001001-00111111-00110010Explanation
C. The first three bytes of a hardware (MAC) address are considered the OUI portion and identify
the manufacturer of the card. This code, which is assigned by the IEEE, is called the organizationally
unique identifier (OUI). The first three bytes are C9-3F-32, which is 11001001-
00111111-00110010 in binary.Rate this question:
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Current Version
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Mar 21, 2022Quiz Edited by
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Apr 08, 2012Quiz Created by
Miday8
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