WGU D315 Study Guide (Latest 2026/2027 Update) Network and Security Foundation with Verified Answers | 100% Correct.

WGU D315 Study Guide (Latest 2026/2027
Update) Network and Security Foundation
with Verified Answers | 100% Correct.

Question:

Network Layer?
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Answer:

This layer defines the logical transmission protocols for the whole
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network. The main protocols that live in this layer are internet protocol
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(IP), internet control message protocol (ICMP), and address resolution
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protocol (ARP).
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Question:

Network interface Layer?
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Answer:

This layer establishes how data should be physically sent through the
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network.




Question:
OSI Model?
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,Answer:

Open Systems Interconnection Model
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Question:

Physical Layer (Layer 1)? i,- i,- i,-




Answer:

This layer is responsible for the physical connections of the devices in the
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network. This layer is implemented through the use of devices such as
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hubs, repeaters, modem devices, and physical cabling.
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Question:

Data Link Layer (Layer 2)?
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Answer:

This layer is responsible for the error-free delivery of data to the receiving
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device or node. This layer is implemented through the use of devices such
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as switches and bridge devices, as well as anything with a network
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interface, like wireless or wired network cards.
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Question:

Network Layer (Layer 3)? i,- i,- i,-




Answer:

,This layer is responsible for the transmission of data between hosts in
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different networks as well as routing of data packets. This layer is
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implemented through the use of devices such as routers and some
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switches.



Question:

TCP/IP?

Answer:

Transmission Control Protocol/Internet Protocol
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Question:

Application Layer? i,-




Answer:

This layer is responsible for the communication protocols between nodes.
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The protocols in this layer include hypertext transfer protocol (HTTP and
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HTTPS), Secure Shell (SSH), and network time protocol (NTP), among
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many others.
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Question:

Transport Layer? i,-




Answer:

, This layer is responsible for the end-to-end transport of data. The
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protocols that live in this layer are transmission control protocol (TCP) and
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user datagram protocol (UDP).
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Question:

Transport layer (layer 4)? i,- i,- i,-




Answer:

In this layer protocols ensure that data are transferred from point A to
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point B reliably and without errors. this layer services include flow control,
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acknowledgment, error correction, segmentation, reassembly, and i,- i,- i,- i,- i,- i,-



sequencing.




Question:
Session Layer (Layer 5)? i,- i,- i,-




Answer:

This layer is responsible for connection establishment, session
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maintenance, and authentication. i,- i,-




Question:
Presentation Layer (Layer 6)? i,- i,- i,-