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20 Cards in this Set
- Front
- Back
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A receiving host has failed to receive all the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
A. Send a different source port number B. Restart the virtual circuit. C. Decrease the sequence number. D Decrease the window size. |
D.
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What 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 and network address D. FCS field |
A, D.
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Which layer 1 devices can be used to enlarge the area covered by a single LAN segment? (Choose two.)
A. Switch B. NIC C. Hub D. Repeater E. RJ45 transceiver |
C, D.
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Segmentation of a data stream happens at which layer of the OSI model?
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D.
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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 |
A, C, E, G.
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Routers operate at layer _. LAN switches operate at layer _. Ethernet hubs operate at layer _. Word processing operates at layer _.
A. 3, 3, 1, 7 B. 3, 2, 1, none C. 3, 2, 1, 7 D. 2, 3, 1, 7 E. 3, 3, 2, none. |
B.
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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. |
C.
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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 standardisation by defining what functions occur at each layer of the model. E. It provides a framework by which changes in functionality in one layer requires changes in other layers. |
A, D.
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What are two purposes for segmentation with a bridge?
A. To add more broadcast domains B. To create more collision domains C. To add more bandwidth for users D. To allow more broadcasts for users |
B, C.
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Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet? (Choose two.)
A. Half-duplex Ethernet operates in a shared collision domain. B. Half-duplex Ethernet operates in a private collision domain. C. Half-duplex Ethernet has a higher effective throughput. D. Half-duplex Ethernet has a lower effective throughput. E. Half-duplex Ethernet operates in a private broadcast domain. |
A, D.
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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. Fibre-optic cable |
D.
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Acknowledgements, sequencing, and flow control are characteristics of which OSI layer?
A. Layer 2 B. Layer 3 C. Layer 4 D. Layer 7 |
C.
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Which are the following are types of flow control?
A. Buffering B. Cut-through C. Windowing D. Congestion avoidance E. VLANs |
A, C, D.
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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 |
B, C, E
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What is the purpose of flow control?
A. To ensure that data is retransmitted if an acknowledgement is not received B. To reassemble segments in the correct order at the destination device C. To provide a means for the receiver to govern the amount of data sent by the sender D. To regulate the size of each segment |
C.
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Which three statements are true about the operation of a full-duplex Ethernet network?
A. There are no collisions in full-duplex mode B. A dedicated switch port is required for each full-duplex node C. Ethernet hub ports are preconfigured for full-duplex mode D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting E. The host network card and the switch port must be capable of operating in full-duplex mode |
A, B, E
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What type of RJ45 UTP cable is used between switches?
A. Straight-through B. Crossover cable C. Crossover with a CSU-DSU D. Crossover with a router in between the two switches |
B.
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How does the host on an Ethernet LAN know when to transmit after a collision has occurred? (Choose two.)
A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting C. You can improve the CSMA/CD network by adding more hubs D. After a collision, the station that detected the collision has first priority to resend the lost data E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data F. After a collision, all stations involved run an identical backoff algorithm and then synchronise with each other prior to transmitting data |
B, E.
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What type of RJ45 UTP cable to you use to connect a PC's COM port to a router or switch console port?
A. Straight-through B. Crossover cable C. Crossover with a CSU/DSU D. Rolled |
D.
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You have the following binary number:
10110111 What are the decimal and hexadecimal equivalents? A. 69/0x2102 B. 183/B7 C. 173/A6 D. 83/0xC5 |
B.
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