CompTIA Network+ Certification (N10-003) Part 8
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30 CompTIA Network+ questions covering MAC addressing and the OSI model.
- 1.
The MAC address f2:a1:23:bc:d3:41 consists of a manufacturer ID and a station ID. Which three bytes represents the station identifier?
- A.
F2:a1:23
- B.
A1:23:bc
- C.
23:bc:d3
- D.
Bc:d3:41
Correct Answer
D. Bc:d3:41Explanation
A MAC address consists of two parts: an Organizationally Unique Identifier (OUI) which is administered by the IEEE and uniquely identifies the manufacturer of the interface; and a device ID which identifies the interface. The first three sets of digits represents the OUI while the last three digits represents the device ID.Rate this question:
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- 2.
The MAC address f2:a1:23:bc:d3:41 consists of a manufacturer ID and a station ID. Which three bytes represents the manufacturer identifier, also known as the Organizationally Unique Identifer (OUI)?
- A.
F2:a1:23
- B.
A1:23:bc
- C.
23:bc:d3
- D.
Bc:d3:41
Correct Answer
A. F2:a1:23Explanation
A MAC address consists of two parts: an Organizationally Unique Identifier (OUI) which is administered by the IEEE and uniquely identifies the manufacturer of the interface; and a device ID which identifies the interface. The first three sets of digits represents the OUI while the last three digits represents the device ID.Rate this question:
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- 3.
At which layers of the OSI reference model does packet filtering occur?
- A.
Physical and Data Link
- B.
Data Link and Network
- C.
Data Link and Transport
- D.
Network and Transport
Correct Answer
D. Network and TransportExplanation
The Network Layer of the OSI model is responsible for end-to-end delivery of data packets. This includes routing and can include packet filtering. The Transport Layer of the OSI model is responsible for several functions, including the choice of protocols, error recovery and flow control and reordering of the incoming data stream. Through flow control, packet filtering can be implementedRate this question:
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- 4.
Which layer of the OSI reference model is responsible for signal encoding?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
A. pHysicalExplanation
The Physical Layer of the OSI is concerned with the physical elements of the network. This includes the transmission medium and physical topology. One of the functions of the Physical Layer is signal encoding, which is the translation of data into electronic signals that can be transmitted on a transmission medium.Rate this question:
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- 5.
Which layer of the OSI reference model defines data delivery across an individual link?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
B. Data LinkExplanation
The Data Link Layer of the OSI is concerned with getting data across a particular link or medium and defines delivery across an individual linkRate this question:
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- 6.
At which layer of the OSI reference model does routing occur?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
C. NetworkExplanation
The Network Layer of the OSI ensures that the data arrives at the correct destination. As such, it is concerned with network addressing and routingRate this question:
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- 7.
Which layer of the OSI reference model is concerned with network addressing?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
C. NetworkExplanation
The Network Layer of the OSI ensures that the data arrives at the correct destination. As such, it is concerned with network addressing and routing.Rate this question:
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- 8.
At which layer of the OSI reference model does data compression occur?
- A.
Transport
- B.
Session
- C.
Presentation
- D.
Application
Correct Answer
C. PresentationExplanation
The Presentation Layer of the OSI model converts the data from the lower layers into a format that the upper-layer processes require. In addition, the Presentation Layer also provides encryption, data compression and character-set translation which is also called code conversion.Rate this question:
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- 9.
At which layer of the OSI reference model does data encryption occur?
- A.
Transport
- B.
Session
- C.
Presentation
- D.
Application
Correct Answer
C. PresentationExplanation
The Presentation Layer of the OSI model converts the data from the lower layers into a format that the upper-layer processes require. In addition, the Presentation Layer also provides encryption, data compression and character-set translation which is also called code conversion.Rate this question:
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- 10.
At which layer of the OSI reference model does character-set translation occur?
- A.
Transport
- B.
Session
- C.
Presentation
- D.
Application
Correct Answer
C. PresentationExplanation
The Presentation Layer of the OSI model converts the data from the lower layers into a format that the upper-layer processes require. In addition, the Presentation Layer also provides encryption, data compression and character-set translation which is also called code conversion.Rate this question:
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- 11.
At which layer of the OSI reference model does error recovery and flow control occur?
- A.
Transport
- B.
Session
- C.
Presentation
- D.
Application
Correct Answer
A. TransportExplanation
The Transport Layer of the OSI model defines several functions, including the choice of protocols, error recovery and flow controlRate this question:
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- 12.
Which layer of the OSI reference model is responsible for session creation?
- A.
Transport
- B.
Session
- C.
Presentation
- D.
Application
Correct Answer
B. SessionExplanation
The Session Layer of the OSI model is responsible for establishing, maintaining and breaking sessions.Rate this question:
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- 13.
Which of the following statements regarding the OSI reference model is true?
- A.
The Transport Layer of the OSI model defines several standard network services, as well as the interface between the network and application
- B.
The Session Layer of the OSI model is responsible for establishing, maintaining and breaking sessions
- C.
The Presentation Layer of the OSI model defines the choice of protocols, provides error recovery and flow control
- D.
The Application Layer of the OSI model converts the data from the lower layers into a format that the upper-layer processes require
Correct Answer
B. The Session Layer of the OSI model is responsible for establishing, maintaining and breaking sessionsExplanation
The Session Layer of the OSI model is responsible for establishing, maintaining and breaking sessions.Rate this question:
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- 14.
Which of the following statements regarding the OSI reference model is false?
- A.
One of the functions of the Physical Layer is signal encoding, which is the translation of data into electronic signals that can be transmitted on a transmission medium
- B.
The Data Link Layer is concerned with getting data across a particular link or medium and defines delivery across an individual link
- C.
The Network Layer of the OSI is responsible for the establishment, maintenance and breaking of sessions
- D.
The Transport Layer of the OSI is concerned about the structure of messages and the validity of transmissions
Correct Answer
C. The Network Layer of the OSI is responsible for the establishment, maintenance and breaking of sessionsExplanation
The Network Layer of the OSI ensures that the data arrives at the correct destination. As such, it is concerned with network addressing and routing, not session management. The Session Layer is concerned with the establishment, maintenance and breaking of sessions.Rate this question:
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- 15.
You are working as a senior network technician. One of your trainees asks you to clarify at which Open Systems Interconnect (OSI) layers a packet filtering firewall operates. How do you answer?
- A.
Network and Data Link
- B.
Network and Transport
- C.
Transport and Session
- D.
Physical and Data Link
Correct Answer
B. Network and TransportExplanation
The Network Layer of the OSI model is responsible for end-to-end delivery of data packets. This includes routing and can include packet filtering. The Transport Layer of the OSI model is responsible for several functions including the choice of protocols, error recovery and flow control and the reordering of the incoming data stream. Through flow control, packet filtering can be implemented.Rate this question:
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- 16.
A trainee asks you what the OSI layer where digital data is converted into electronic signals to be put on a wire is called. How do you answer?
- A.
The Physical Layer
- B.
The Transport Layer
- C.
The Data Link Layer
- D.
The Presentation Layer
Correct Answer
A. The pHysical LayerExplanation
The Physical Layer of the OSI is concerned with the physical elements of the network. This includes the transmission medium and physical topology. One of the functions of the Physical layer is signal encoding, which is the translation of data into electronic signals that can be transmitted on a transmission medium.Rate this question:
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- 17.
You are a working as a technician and your boss asks you to clarify the difference between routers and switches. You tell him that switches work at the Data Link Layer of the OSI model while routers work at the _____.
- A.
Physical layer
- B.
Data Link layer
- C.
Network layer
- D.
Application layer
Correct Answer
C. Network layerExplanation
The Network Layer of the OSI model is responsible for end-to-end delivery of data packets. This includes routing and can include packet filtering.Rate this question:
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- 18.
A developer asks you which of the OSI layers that is responsible for translating from application to network, formatting and code conversations. How would you answer?
- A.
The Transport Layer
- B.
The Data Link Layer
- C.
The Application Layer
- D.
The Presentation Layer
Correct Answer
D. The Presentation LayerExplanation
The Presentation Layer of the OSI model converts the data from the lower layers into a format that the upper-layer processes require. In addition, the Presentation Layer also provides encryption, data compression and character-set translation which is also called code conversion.Rate this question:
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- 19.
Which of the following operate at the Physical Layer?
- A.
Hubs
- B.
Routers
- C.
Switches
- D.
Wireless Access Points
Correct Answer
A. HubsExplanation
Hubs merely retransmit data and thus operate at the Physical Layer (Layer 1) of the OSI reference model.Rate this question:
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- 20.
Which of the following operate at the Data Link Layer? (choose all that apply)
- A.
Hubs
- B.
Routers
- C.
Switches
- D.
Wireless Access Points
Correct Answer(s)
C. Switches
D. Wireless Access PointsExplanation
Both switches and Wireless Access Points (WAPs) use MAC addresses to filter traffic. As MAC addressing is performed at the Data Link layer (Layer 2), both switches and WAPs are Layer 2 devices.Rate this question:
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- 21.
Which of the following operate at the Network Layer?
- A.
Hubs
- B.
Routers
- C.
Switches
- D.
Wireless Access Points
Correct Answer
B. RoutersExplanation
Routers are responsible for the efficient routing of network traffic in an internetwork. As routing occurs at the Network Layer (Layer 3), routers are Layer 3 devices.Rate this question:
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- 22.
At which layer of the OSI reference model does a router operate?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
C. NetworkExplanation
The Network Layer of the OSI ensures that the data arrives at the correct destination. As such, it concerned with network addressing and routing. A router is responsible for routing and functions at the Network Layer.Rate this question:
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- 23.
At which layer of the OSI reference model does a hub operate?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
A. pHysicalExplanation
The Physical Layer of the OSI is concerned with the physical elements of the network. This includes the transmission medium, the physical topology, the voltage, signal direction and signal strength. Hubs merely retransmit data and thus operate at the Physical Layer (Layer 1) of the OSI reference model.Rate this question:
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- 24.
Which of the following operate at the upper three layers of the OSI model?
- A.
Routers
- B.
Switches
- C.
Gateways
- D.
Wireless Access Points
Correct Answer
C. GatewaysExplanation
A gateway is used to connect two dissimilar networks. It operates at all the layers of the OSI.Rate this question:
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- 25.
Which of the following do not operate at Layer 2 of the OSI? (choose all that apply)
- A.
Bridges
- B.
Routers
- C.
Switches
- D.
Wireless Access Points
- E.
Network Interface Cards
Correct Answer(s)
B. Routers
E. Network Interface CardsExplanation
Routers operate at Layer 3 while Network Interface Cards operate at Layer 1.Rate this question:
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- 26.
Which of the following operate at the Data Link Layer of the OSI?
- A.
Bridges, switches and wireless access points
- B.
Wireless access points and routers
- C.
Bridges, switches and routers
- D.
Network interface cards
Correct Answer
A. Bridges, switches and wireless access pointsExplanation
Bridges, switches and wireless access points all operate at the Data Link Layer of the OSI which is Layer 2.Rate this question:
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- 27.
You need a networking device that operates at the three uppermost layers of the OSI model and that can connect networks with different architectures. Which of the following would accomplish this?
- A.
Router
- B.
Firewall
- C.
Modem
- D.
Gateway
Correct Answer
D. GatewayExplanation
A gateway is used to connect two dissimilar networks. It operates at all the layers of the OSI.Rate this question:
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- 28.
You are asked to identify two devices classified as Layer 2. Which would you select?
- A.
Switches and routers
- B.
Switches and bridges
- C.
Switches and NICs
- D.
Hubs and switches
Correct Answer
B. Switches and bridgesExplanation
Switches and bridges operate at the Data Link Layer of the OSI and are thus Layer 2 devices.Rate this question:
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- 29.
Which of the following is responsible for resolving MAC address to an IP address
- A.
ARP
- B.
DNS
- C.
RARP
- D.
WINS
Correct Answer
C. RARPExplanation
Reverse ARP resolves a MAC address to an IP address. The MAC address is a Data Link Layer address that is embedded in a ROM on the network device and is hard-coded to each network interface.Rate this question:
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- 30.
Which of the following is responsible for resolving an IP address to a MAC address?
- A.
ARP
- B.
DNS
- C.
DHCP
- D.
WINS
Correct Answer
A. ARPExplanation
The Address Resolution Protocol (ARP) resolves an IP address to the MAC address. The MAC address is a Data Link Layer address that is embedded in a ROM on the network device and is hard-coded to each network interface.Rate this question:
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Apr 23, 2024Quiz Edited by
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Sep 11, 2010Quiz Created by
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