Question 1

Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet? Half-duplex Ethernet operates in a shared collision domain. Half-duplex Ethernet operates in a private collision domain. Half-duplex Eth…

Accepted Answer

Unlike full duplex, half-duplex Ethernet operates in a shared collision domain, and it has a lower effective throughput than full duplex.

Question 2

Which of the following are types of flow control? Buffering Cut-through Windowing Congestion avoidance

Accepted Answer

The common types of flow control are buffering, windowing, and congestion avoidance.

Question 3

Which three statements are true about the operation of a full-duplex Ethernet network? There are no collisions in full-duplex mode. A dedicated switch port is required for each full-duplex node. Ethernet hub ports are preconfigured for full-duplex m…

Accepted Answer

Full-duplex means you are using both wire pairs simultaneously to send and receive data. You must have a dedicated switch port for each node, which means you will not have collisions. Both the host network card and the switch port must be capable and set to work in full-duplex mode.

Question 4

What are two purposes for segmentation with a bridge? To add more broadcast domains. To create more collision domains. To add more bandwidth for users. To allow more broadcasts for users.

Accepted Answer

Bridges break up collision domains, which allow more bandwidth for users.

Question 5

Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

Accepted Answer

Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.

Question 6

Which of the following describe router functions?

Accepted Answer

Routers provide packet switching, packet filtering, internetwork communication, and path selection.

Question 7

A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

Accepted Answer

A receiving host can control the transmitter by using flow control (TCP uses Windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does not overflow its buffers.

Question 8

Which layer 1 devices can be used to enlarge the area covered by a single LAN segment? Switch NIC Hub Repeater RJ45 transceiver

Accepted Answer

Not that you really want to enlarge a single collision domain, but a hub (multiport repeater) will provide this for you.

Question 9

When data is encapsulated, which is the correct order?

Accepted Answer

The encapsulation method is data, segment, packet, frame, bit.

Question 10

What is the purpose of flow control?

Accepted Answer

Flow control allows the receiving device to control the transmitter so the receiving device's buffer does not overflow.

Question 11

How to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?

Accepted Answer

Fiber-optic cable provides a more secure, long-distance cable that is not susceptible to EMI interference at high speeds.

Question 12

What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?

Accepted Answer

To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.

Question 13

Why does the data communication industry use the layered OSI reference model? It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting. It enables equipment from…

Accepted Answer

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 compo- nent development, design, and troubleshooting; it allows multiple-vendor development through standardization of network components; it encourages industry standardization by defining what functions occur at each layer of the model; it allows various types of network hardware and software to communicate;

Question 14

Segmentation of a data stream happens at which layer of the OSI model?

Accepted Answer

The Transport layer receives large data streams from the upper layers and breaks these up into smaller pieces called segments.

Question 15

How does a host on an Ethernet LAN know when to transmit after a collision has occurred? In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously. In a CSMA/CD collision domain, stations must wait until the medi…

Accepted Answer

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, but they must make sure the media is clear before transmitting and that they all have equal priority.

Question 16

Which fields are contained within an IEEE Ethernet frame header? Source and destination MAC address Source and destination network address Source and destination MAC address and source and destination network address FCS field

Accepted Answer

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 answer to the CRC.

Question 17

What are the decimal and hexadecimal equivalents for the binary number 10110111?

Accepted Answer

You must be able to take a binary number and convert it into both decimal and hexadecimal. To convert to decimal, just add up the 1s using their values. The values that are turned on with the binary number of 10110111 are 128 + 32 + 16 + 4 + 2 + 1 = 183. To get the hexadecimal equivalent, you need to break the eight binary digits into nibbles (4 bits), 1011 and 0111. By add- ing up these values, you get 11 and 7. In hexadecimal, 11 is B, so the answer is 0xB7.

Question 18

What type of RJ45 UTP cable is used between switches?

Accepted Answer

To connect two switches together, you would use a RJ45 UTP crossover cable.

Question 19

Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?

Accepted Answer

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).

Question 20

Which of the following types of connections can use full duplex? Hub to hub Switch to switch Host to host Switch to hub Switch to host

Accepted Answer

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, but a hub can never run full duplex.

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