D481 OA Terminology Exam 2025
Questions and Answers
TCP/IP Application Layer 4 - ANSWER✔✔-The top of the TCP/IP Reference Model,
which maps to OSI Layers 5, 6, and 7. This interacts with applications that need to gain
access to network services.
TCP/IP Transport or Host-to-Host Layer 3 - ANSWER✔✔-Provides end-to-end
delivery, which maps to OSI Layer 4. This layer segments the data and adds a checksum
to properly validate data to ensure that it has not been corrupted.
TCP/IP Network or Internet Layer 2 - ANSWER✔✔-Handles the routing of packets as
they move around the network. It maps to Layer 3 of the OSI model.
TCP/IP Physical or Network Access Layer 1 - ANSWER✔✔-Resides at the lowest layer
of the TCP/IP model and is the point at which the higher-layer protocols interface with
the network transport media. When compared to the OSI model, this layer corresponds
to OSI Layer 1 and Layer 2.
, OSI Application Layer 7 - ANSWER✔✔-Responsible for interacting with end users. This
Layer includes all programs on a computer that interact with the network; for example,
your email software is included because it must transmit and receive messages over the
network. A simple game like Solitaire doesn't fit here because it does not require the
network to operate.
OSI Presentation Layer 6 - ANSWER✔✔-This is responsible for the coding of data. This
Layer includes file formats and character representations. From a security perspective,
encryption generally takes place at this layer.
OSI Session Layer 5 - ANSWER✔✔-This is responsible for maintaining communication
sessions between computers. This Layer creates, maintains, and disconnects
communications that take place between processes over the network.
OSI Transport Layer 4 - ANSWER✔✔-This is responsible for breaking data into packets
and properly transmitting them over the network. Flow control and error checking take
place here. TCP operates in this layer
OSI Network Layer 3 - ANSWER✔✔-This is responsible for the logical implementation
of the network. One important feature of this Layer is logical addressing. In TCP/IP
networking, logical addressing takes the familiar form of IP addresses. IPs operate in
this layer.
Questions and Answers
TCP/IP Application Layer 4 - ANSWER✔✔-The top of the TCP/IP Reference Model,
which maps to OSI Layers 5, 6, and 7. This interacts with applications that need to gain
access to network services.
TCP/IP Transport or Host-to-Host Layer 3 - ANSWER✔✔-Provides end-to-end
delivery, which maps to OSI Layer 4. This layer segments the data and adds a checksum
to properly validate data to ensure that it has not been corrupted.
TCP/IP Network or Internet Layer 2 - ANSWER✔✔-Handles the routing of packets as
they move around the network. It maps to Layer 3 of the OSI model.
TCP/IP Physical or Network Access Layer 1 - ANSWER✔✔-Resides at the lowest layer
of the TCP/IP model and is the point at which the higher-layer protocols interface with
the network transport media. When compared to the OSI model, this layer corresponds
to OSI Layer 1 and Layer 2.
, OSI Application Layer 7 - ANSWER✔✔-Responsible for interacting with end users. This
Layer includes all programs on a computer that interact with the network; for example,
your email software is included because it must transmit and receive messages over the
network. A simple game like Solitaire doesn't fit here because it does not require the
network to operate.
OSI Presentation Layer 6 - ANSWER✔✔-This is responsible for the coding of data. This
Layer includes file formats and character representations. From a security perspective,
encryption generally takes place at this layer.
OSI Session Layer 5 - ANSWER✔✔-This is responsible for maintaining communication
sessions between computers. This Layer creates, maintains, and disconnects
communications that take place between processes over the network.
OSI Transport Layer 4 - ANSWER✔✔-This is responsible for breaking data into packets
and properly transmitting them over the network. Flow control and error checking take
place here. TCP operates in this layer
OSI Network Layer 3 - ANSWER✔✔-This is responsible for the logical implementation
of the network. One important feature of this Layer is logical addressing. In TCP/IP
networking, logical addressing takes the familiar form of IP addresses. IPs operate in
this layer.
