The following questions are designed to test your understanding of this chapter's material. For more information on how to get additional questions, please see this book's introduction.
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?
Send a different source port number.
Restart the virtual circuit.
Decrease the sequence number.
Decrease the window size.
Which fields are contained within an IEEE Ethernet frame header? (Choose two.)
Source and destination MAC address
Source and destination network address
Source and destination MAC address and source and destination network address
FCS field
Which layer 1 devices can be used to enlarge the area covered by a single LAN segment? (Choose two.)
Switch
NIC
Hub
Repeater
RJ45 transceiver
Segmentation of a data stream happens at which layer of the OSI model?
Physical
Data Link
Network
Transport
Which of the following describe router functions? (Choose four.)
Packet switching
Collision prevention
Packet filtering
Broadcast domain enlargement
Internetwork communication
Broadcast forwarding
Path selection
Routers operate at layer __. LAN switches operate at layer __. Ethernet hubs operate at
layer __. Word processing operates at layer __.
3, 3, 1, 7
3, 2, 1, none
3, 2, 1, 7
2, 3, 1, 7
3, 3, 2, none
When data is encapsulated, which is the correct order?
Data, frame, packet, segment, bit
Segment, data, packet, frame, bit
Data, segment, packet, frame, bit
Data, segment, frame, packet, bit
Why does the data communication industry use the layered OSI reference model? (Choose two.)
It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.
It encourages industry standardization by defining what functions occur at each layer of the model.
It provides a framework by which changes in functionality in one layer require changes in other layers.
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
Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet? (Choose two.)
Half-duplex Ethernet operates in a shared collision domain.
Half-duplex Ethernet operates in a private collision domain.
Half-duplex Ethernet has higher effective throughput.
Half-duplex Ethernet has lower effective throughput.
Half-duplex Ethernet operates in a private broadcast domain.
You want to implement an Ethernet network medium that is not susceptible to EMI or voltage potential differences between two buildings. Which type of cabling should you use?
Thicknet coax
Thinnet coax
Category 5 UTP cable
Fiber-optic cable
Acknowledgments, sequencing, and flow control are characteristic of which OSI layer?
Layer 2
Layer 3
Layer 4
Layer 7
Which of the following are types of flow control? (Choose all that apply.)
Buffering
Cut-through
Windowing
Congestion avoidance
VLANs
Which of the following types of connections can use full duplex? (Choose three.)
Hub to hub
Switch to switch
Host to host
Switch to hub
Switch to host
What is the purpose of flow control?
To ensure that data is retransmitted if an acknowledgment is not received
To reassemble segments in the correct order at the destination device
To provide a means for the receiver to govern the amount of data sent by the sender
To regulate the size of each segment
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 mode.
In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.
The host network card and the switch port must be capable of operating in full-duplex mode.
What type of RJ45 UTP cable is used between switches?
Straight-through
Crossover cable
Crossover with a CSU/DSU
Crossover with a router in between the two switches
How does a host on an Ethernet LAN know when to transmit after a collision has occurred? (Choose two.)
In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
You can improve the CSMA/CD network by adding more hubs.
After a collision, the station that detected the collision has first priority to resend the lost data.
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.
After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.
What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?