DCOM 101 Final Exam Questions and Answers Latest
Solutions 100% Correct
The Physical layer has been divided into two sublayers, called the LLC sublayer
and the MAC sublayer
False
Which layer has been subdivided into the Logical Link Control sublayer and the
Media Access Control sublayer?
Data Link
Which layer is responsible for establishing communication setup between the
source and destination computers?
Session
Switches operate at this layer
Data Link Layer
Hubs operate at this layer
Physical Layer
Sublayer manages access to the physical medium.
Media Access Control sublayer
Computers operate at this layer.
Application Layer
This sublayer is responsible for some error recovery.
Logical Link Control sublayer
This is the general framework for how networking systems should operate.
OSI reference model
Routers operate at this layer
Network layer
This layer handles data formatting and translation
Presentation layer
This uses port numbers as source and destination identifiers
Transport layer
This handles communication setup and teardown
Session layer
Which of the following is the correct order of the layers of the OSI model from
layer 1 to layer 7?
Physical, Data Link, Network, Transport, Session, Presentation, Application
The process of stripping the header and trailer from a PDU is called
____________.
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?
Network layer device
At what layer do NICs operate?
, Data Link
Which layer of the OSI model is responsible for encryption and decryption?
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?
encapsulation
The Transport layer segments data into smaller chunks, the size of which is
determined by which of the following?
MTU
What does the Transport layer use to make sure that a message is reassembled
correctly on the receiving device?
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
6
What is the IEEE standard that governs all forms of Ethernet media and
interfaces?
802.3
What is a PDU?
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.
OSI
One of the problems that can occur in the Network layer is the incorrect
configuration of a hosts IP address.
True
Which layer is responsible for determining the best path a packet should travel
across an internetwork?
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?
access control
What information would you find in the header of a Transport layer PDU?
window size
The Network layer communicates with the Data Link layer and the Session layer
False
Which layer is responsible for the encoding of signals?
1
The ____________ layer is the bottom layer, whose job it is to convert bits into
signals and vice versa.
Physical
The maximum transmission unit for Ethernet is 1518 bytes
True
Which of the following are protocols that you find at the Application layer of the
OSI model?
Solutions 100% Correct
The Physical layer has been divided into two sublayers, called the LLC sublayer
and the MAC sublayer
False
Which layer has been subdivided into the Logical Link Control sublayer and the
Media Access Control sublayer?
Data Link
Which layer is responsible for establishing communication setup between the
source and destination computers?
Session
Switches operate at this layer
Data Link Layer
Hubs operate at this layer
Physical Layer
Sublayer manages access to the physical medium.
Media Access Control sublayer
Computers operate at this layer.
Application Layer
This sublayer is responsible for some error recovery.
Logical Link Control sublayer
This is the general framework for how networking systems should operate.
OSI reference model
Routers operate at this layer
Network layer
This layer handles data formatting and translation
Presentation layer
This uses port numbers as source and destination identifiers
Transport layer
This handles communication setup and teardown
Session layer
Which of the following is the correct order of the layers of the OSI model from
layer 1 to layer 7?
Physical, Data Link, Network, Transport, Session, Presentation, Application
The process of stripping the header and trailer from a PDU is called
____________.
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?
Network layer device
At what layer do NICs operate?
, Data Link
Which layer of the OSI model is responsible for encryption and decryption?
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?
encapsulation
The Transport layer segments data into smaller chunks, the size of which is
determined by which of the following?
MTU
What does the Transport layer use to make sure that a message is reassembled
correctly on the receiving device?
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
6
What is the IEEE standard that governs all forms of Ethernet media and
interfaces?
802.3
What is a PDU?
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.
OSI
One of the problems that can occur in the Network layer is the incorrect
configuration of a hosts IP address.
True
Which layer is responsible for determining the best path a packet should travel
across an internetwork?
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?
access control
What information would you find in the header of a Transport layer PDU?
window size
The Network layer communicates with the Data Link layer and the Session layer
False
Which layer is responsible for the encoding of signals?
1
The ____________ layer is the bottom layer, whose job it is to convert bits into
signals and vice versa.
Physical
The maximum transmission unit for Ethernet is 1518 bytes
True
Which of the following are protocols that you find at the Application layer of the
OSI model?
