DCOM 101 Final UPDATED Actual Exam
Questions and CORRECT Answers
The Physical layer has been divided into two sublayers, called the LLC sublayer and the
MAC sublayer - CORRECT ANSWER✔✔- False
Which layer has been subdivided into the Logical Link Control sublayer and the Media
Access Control sublayer? - CORRECT ANSWER✔✔- Data Link
Which layer is responsible for establishing communication setup between the source and
destination computers? - CORRECT ANSWER✔✔- Session
Switches operate at this layer - CORRECT ANSWER✔✔- Data Link Layer
Hubs operate at this layer - CORRECT ANSWER✔✔- Physical Layer
Sublayer manages access to the physical medium. - CORRECT ANSWER✔✔- Media Access
Control sublayer
Computers operate at this layer. - CORRECT ANSWER✔✔- Application Layer
This sublayer is responsible for some error recovery. - CORRECT ANSWER✔✔- Logical
Link Control sublayer
This is the general framework for how networking systems should operate. - CORRECT
ANSWER✔✔- OSI reference model
Routers operate at this layer - CORRECT ANSWER✔✔- Network layer
This layer handles data formatting and translation - CORRECT ANSWER✔✔- Presentation
layer
,This uses port numbers as source and destination identifiers - CORRECT ANSWER✔✔-
Transport layer
This handles communication setup and teardown - CORRECT ANSWER✔✔- Session layer
Which of the following is the correct order of the layers of the OSI model from layer 1 to
layer 7? - CORRECT ANSWER✔✔- Physical, Data Link, Network, Transport, Session,
Presentation, Application
The process of stripping the header and trailer from a PDU is called ____________. -
CORRECT ANSWER✔✔- deencapsulation
You are working at the help desk and you get a message that a user cannot access the Internet.
You open a command prompt, ping the workstation's IP address, and get a response. You ask
the user to try the Internet again. He does so with the same result— no connection. Which
type of device is most likely to be the problem? - CORRECT ANSWER✔✔- Network layer
device
At what layer do NICs operate? - CORRECT ANSWER✔✔- Data Link
Which layer of the OSI model is responsible for encryption and decryption? - CORRECT
ANSWER✔✔- Presentation
at each layer of the OSI model, data is appended to the original message and then sent on to
the next lower layer. What is this process called? - CORRECT ANSWER✔✔- encapsulation
The Transport layer segments data into smaller chunks, the size of which is determined by
which of the following? - CORRECT ANSWER✔✔- MTU
What does the Transport layer use to make sure that a message is reassembled correctly on
the receiving device? - CORRECT ANSWER✔✔- sequence number
, What layer is responsible for making sure that the data that it sends and receives is in a
format that the receiving and sending computers can understand - CORRECT ANSWER✔✔-
6
What is the IEEE standard that governs all forms of Ethernet media and interfaces? -
CORRECT ANSWER✔✔- 802.3
What is a PDU? - CORRECT ANSWER✔✔- It is the name given to the unit of information
used by each layer.
The ____________ reference model is a general framework for networking systems that uses
a layered approach to reduce its complexity. - CORRECT ANSWER✔✔- OSI
One of the problems that can occur in the Network layer is the incorrect configuration of a
hosts IP address. - CORRECT ANSWER✔✔- True
Which layer is responsible for determining the best path a packet should travel across an
internetwork? - CORRECT ANSWER✔✔- Network
One job that a router performs is that of gatekeeper, which means that it can be configured to
only allow certain packets access into the network based on a list of rules. What is that
process called? - CORRECT ANSWER✔✔- access control
What information would you find in the header of a Transport layer PDU? - CORRECT
ANSWER✔✔- window size
The Network layer communicates with the Data Link layer and the Session layer -
CORRECT ANSWER✔✔- False
Which layer is responsible for the encoding of signals? - CORRECT ANSWER✔✔- 1
The ____________ layer is the bottom layer, whose job it is to convert bits into signals and
vice versa. - CORRECT ANSWER✔✔- Physical
Questions and CORRECT Answers
The Physical layer has been divided into two sublayers, called the LLC sublayer and the
MAC sublayer - CORRECT ANSWER✔✔- False
Which layer has been subdivided into the Logical Link Control sublayer and the Media
Access Control sublayer? - CORRECT ANSWER✔✔- Data Link
Which layer is responsible for establishing communication setup between the source and
destination computers? - CORRECT ANSWER✔✔- Session
Switches operate at this layer - CORRECT ANSWER✔✔- Data Link Layer
Hubs operate at this layer - CORRECT ANSWER✔✔- Physical Layer
Sublayer manages access to the physical medium. - CORRECT ANSWER✔✔- Media Access
Control sublayer
Computers operate at this layer. - CORRECT ANSWER✔✔- Application Layer
This sublayer is responsible for some error recovery. - CORRECT ANSWER✔✔- Logical
Link Control sublayer
This is the general framework for how networking systems should operate. - CORRECT
ANSWER✔✔- OSI reference model
Routers operate at this layer - CORRECT ANSWER✔✔- Network layer
This layer handles data formatting and translation - CORRECT ANSWER✔✔- Presentation
layer
,This uses port numbers as source and destination identifiers - CORRECT ANSWER✔✔-
Transport layer
This handles communication setup and teardown - CORRECT ANSWER✔✔- Session layer
Which of the following is the correct order of the layers of the OSI model from layer 1 to
layer 7? - CORRECT ANSWER✔✔- Physical, Data Link, Network, Transport, Session,
Presentation, Application
The process of stripping the header and trailer from a PDU is called ____________. -
CORRECT ANSWER✔✔- deencapsulation
You are working at the help desk and you get a message that a user cannot access the Internet.
You open a command prompt, ping the workstation's IP address, and get a response. You ask
the user to try the Internet again. He does so with the same result— no connection. Which
type of device is most likely to be the problem? - CORRECT ANSWER✔✔- Network layer
device
At what layer do NICs operate? - CORRECT ANSWER✔✔- Data Link
Which layer of the OSI model is responsible for encryption and decryption? - CORRECT
ANSWER✔✔- Presentation
at each layer of the OSI model, data is appended to the original message and then sent on to
the next lower layer. What is this process called? - CORRECT ANSWER✔✔- encapsulation
The Transport layer segments data into smaller chunks, the size of which is determined by
which of the following? - CORRECT ANSWER✔✔- MTU
What does the Transport layer use to make sure that a message is reassembled correctly on
the receiving device? - CORRECT ANSWER✔✔- sequence number
, What layer is responsible for making sure that the data that it sends and receives is in a
format that the receiving and sending computers can understand - CORRECT ANSWER✔✔-
6
What is the IEEE standard that governs all forms of Ethernet media and interfaces? -
CORRECT ANSWER✔✔- 802.3
What is a PDU? - CORRECT ANSWER✔✔- It is the name given to the unit of information
used by each layer.
The ____________ reference model is a general framework for networking systems that uses
a layered approach to reduce its complexity. - CORRECT ANSWER✔✔- OSI
One of the problems that can occur in the Network layer is the incorrect configuration of a
hosts IP address. - CORRECT ANSWER✔✔- True
Which layer is responsible for determining the best path a packet should travel across an
internetwork? - CORRECT ANSWER✔✔- Network
One job that a router performs is that of gatekeeper, which means that it can be configured to
only allow certain packets access into the network based on a list of rules. What is that
process called? - CORRECT ANSWER✔✔- access control
What information would you find in the header of a Transport layer PDU? - CORRECT
ANSWER✔✔- window size
The Network layer communicates with the Data Link layer and the Session layer -
CORRECT ANSWER✔✔- False
Which layer is responsible for the encoding of signals? - CORRECT ANSWER✔✔- 1
The ____________ layer is the bottom layer, whose job it is to convert bits into signals and
vice versa. - CORRECT ANSWER✔✔- Physical
