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Written Lab 1.2: Defining the OSI Layers and Devices
Fill in the blanks with the appropriate layer of the OSI or hub, switch, or router device.
Description
Device or OSI Layer
This device sends and receives information about the Network layer.
This layer creates a virtual circuit before transmitting between two end stations.
This device uses hardware addresses to filter a network.
Ethernet is defined at these layers.
This layer supports flow control, sequencing, and acknowledgments.
This device can measure the distance to a remote network.
Logical addressing is used at this layer.
Hardware addresses are defined at this layer.
This device creates one collision domain and one broadcast domain.
This device creates many smaller collision domains, but the network is still one large
broadcast domain.
This device can never run full-duplex.
This device breaks up collision domains and broadcast domains.
Written Lab 1.3: Identifying Collision and Broadcast Domains
1. In the following exhibit, identify the number of collision domains and broadcast domains in each specified
device. Each device is represented by a letter:
1. Hub
2. Bridge
3. Switch
4. Router
Review Questions
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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
www.lammle.com/ccna
.
You can find the answers to these questions in Appendix B, “Answers to Review Questions.”
1. Which of the following statements is/are true with regard to the device shown here? (Choose all that
apply.)
1. It includes one collision domain and one broadcast domain.
2. It includes 10 collision domains and 10 broadcast domains.
3. It includes 10 collision domains and one broadcast domain.
4. It includes one collision domain and 10 broadcast domains.
2. With respect to the OSI model, which one of the following is the correct statement about PDUs?
1. A segment contains IP addresses.
2. A packet contains IP addresses.
3. A segment contains MAC addresses.
4. A packet contains MAC addresses.
3. You are the Cisco administrator for your company. A new branch office is opening and you are selecting the
necessary hardware to support the network. There will be two groups of computers, each organized by
department. The Sales group computers will be assigned IP addresses ranging from 192.168.1.2 to
192.168.1.50. The Accounting group will be assigned IP addresses ranging from 10.0.0.2 to 10.0.0.50.
What type of device should you select to connect the two groups of computers so that data communication
can occur?
1. Hub
2. Switch
3. Router
4. Bridge
4. The most effective way to mitigate congestion on a LAN would be to ________.
1. Upgrade the network cards
2. Change the cabling to CAT 6
3. Replace the hubs with switches
4. Upgrade the CPUs in the routers
5. In the following work area, draw a line from the OSI model layer to its PDU.
6. What is a function of the WLAN Controller?
1. To monitor and control the incoming and outgoing network traffic
2. To automatically handle the configuration of wireless access points
3. To allow wireless devices to connect to a wired network
4. To connect networks and intelligently choose the best paths between networks
7. You need to provide network connectivity to 150 client computers that will reside in the same subnetwork,
and each client computer must be allocated dedicated bandwidth. Which device should you use to
accomplish the task?
1. Hub
2. Switch
3. Router
4. Bridge
8. In the following work area, draw a line from the OSI model layer definition on the left to its description on
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8. In the following work area, draw a line from the OSI model layer definition on the left to its description on
the right.
Layer
Description
Transport
Framing
Physical End-to-end connection
Data Link
Routing
Network
Conversion to bits
9. What is the function of a firewall?
1. To automatically handle the configuration of wireless access points
2. To allow wireless devices to connect to a wired network
3. To monitor and control the incoming and outgoing network traffic
4. To connect networks and intelligently choose the best paths between networks
10. Which layer in the OSI reference model is responsible for determining the availability of the receiving
program and checking to see whether enough resources exist for that communication?
1. Transport
2. Network
3. Presentation
4. Application
11. Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two.)
1. The Transport layer divides a data stream into segments and may add reliability and flow control
information.
2. The Data Link layer adds physical source and destination addresses and an FCS to the segment.
3. Packets are created when the Network layer encapsulates a frame with source and destination host
addresses and protocol-related control information.
4. Packets are created when the Network layer adds layer 3 addresses and control information to a
segment.
5. The Presentation layer translates bits into voltages for transmission across the physical link.
12. Which of the following layers of the OSI model was later subdivided into two layers?
1. Presentation
2. Transport
3. Data Link
4. Physical
13. What is a function of an access point (AP)?
1. To monitor and control the incoming and outgoing network traffic
2. To automatically handle the configuration of wireless access point
3. To allow wireless devices to connect to a wired network
4. To connect networks and intelligently choose the best paths between networks
14. A_________is an example of a device that operates only at the physical layer.
1. Hub
2. Switch
3. Router
4. Bridge
15. Which of the following is
not a benefit of using a reference model?
1. It divides the network communication process into smaller and simpler components.
2. It encourages industry standardization.
3. It enforces consistency across vendors.
4. It allows various types of network hardware and software to communicate.
16. Which of the following statements is not true with regard to routers?
1. They forward broadcasts by default.
2. They can filter the network based on Network layer information.
3. They perform path selection.
4. They perform packet switching.
17. Switches break up_______domains, and routers break up_______domains.
1. broadcast, broadcast
2. collision, collision
3. collision, broadcast
4. broadcast, collision
18. How many collision domains are present in the following diagram?
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1. 8
2. 9
3. 10
4. 11
19. Which of the following layers of the OSI model is not involved in defining how the applications within the
end stations will communicate with each other as well as with users?
1. Transport
2. Application
3. Presentation
4. Session
20. Which of the following is the
only device that operates at all layers of the OSI model?
1. Network host
2. Switch
3. Router
4. Bridge
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