WGU D315 Network and Security –
Foundations Pre-Assessment Study
Guide | Questions with Verified
Answers & Clear Explanations
(Updated)
2026/2027 Frequently Most Tested Questions and 100% Accurate From
Past papers | Graded A+ , Reviewed and Updated | 100% Guarantee
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QUESTIONS AND ANSWERS
Which OSI layer is related to the function of the IP protocol suite?
a. Transport
b. Network
c. Data Link
d. Session
✔️ Correct Answer: b. Network
Rationale:
The Internet Protocol (IP) operates at the Network layer (Layer 3) of the OSI model. Its
primary function is to provide logical addressing and routing of data packets between
different networks. The Transport layer (Option A) handles end-to-end communication
and error checking. The Data Link layer (Option C) handles physical addressing and frame
delivery. The Session layer (Option D) manages sessions between applications.
,Which OSI layer is responsible for organizing how bits are passed over the physical layer
between devices within the same collision domain?
a. Frame
b. Connection
c. Transport
d. Data Link
✔️ Correct Answer: d. Data Link
Rationale:
The Data Link layer (Layer 2) is responsible for organizing bits into frames and managing
how they are passed over the physical layer within the same collision domain. It also
handles error detection and flow control. The Frame (Option A) is a unit of data at this
layer, not the layer itself. The Connection (Option B) is not an OSI layer. The Transport
layer (Option C) handles end-to-end communication.
Which OSI layer would define the scope of a protocol that makes sure packets of data are
received correctly and resends them if they are not?
a. Validation
b. Transmission
c. Transport
d. Connection
✔️ Correct Answer: c. Transport
Rationale:
The Transport layer (Layer 4) is responsible for ensuring reliable data delivery, including
error checking, sequencing, and retransmission of lost or corrupted packets. Protocols like
TCP operate at this layer. Validation (Option A), Transmission (Option B), and Connection
(Option D) are not OSI layers.
Which protocol suite performs functions of OSI layer 4?
a. IPX
b. MAC
,c. CSMA/CD
d. TCP
✔️ Correct Answer: d. TCP
Rationale:
TCP (Transmission Control Protocol) operates at the Transport layer (Layer 4) of the OSI
model, providing reliable, connection-oriented communication with error checking and
retransmission. IPX (Option A) is a Network layer protocol. MAC (Option B) operates at
the Data Link layer. CSMA/CD (Option C) is a media access control method at the Data
Link layer.
Which type of Ethernet cable can maintain 10 Gbps transmission speeds through the
course of its maximum 100-meter length?
a. CAT 5e
b. CAT 5
c. CAT 3
d. CAT 6a
✔️ Correct Answer: d. CAT 6a
Rationale:
CAT 6a (Category 6 augmented) cable supports 10 Gbps transmission speeds up to its
maximum length of 100 meters. CAT 5e (Option A) supports up to 1 Gbps. CAT 5 (Option
B) supports up to 100 Mbps. CAT 3 (Option C) supports up to 10 Mbps and is obsolete for
modern networking.
Which Internet access technology uses ordinary telephone wires for data transmission?
a. DSL
b. Cable
c. Wi-Fi
d. Hotspot
✔️ Correct Answer: a. DSL
Rationale:
DSL (Digital Subscriber Line) uses ordinary telephone wires for data transmission, allowing
, simultaneous voice and data service. Cable (Option B) uses coaxial cable. Wi-Fi (Option C)
is wireless. Hotspot (Option D) uses cellular or Wi-Fi connections.
Which device is used to organize network cables as they run between switches and other
network devices?
a. Jack
b. Hub
c. Patch Panel
d. Router
✔️ Correct Answer: c. Patch Panel
Rationale:
A patch panel is used to organize and manage network cables, providing a central point
for cable termination and easy reconfiguration. A jack (Option A) is an outlet for
connecting devices. A hub (Option B) forwards signals to all ports. A router (Option D)
connects different networks.
Which network device is used to connect two or more network segments by performing
OSI layer 3 functions like packet-forwarding?
a. Router
b. Repeater
c. Wire
d. Switch
✔️ Correct Answer: a. Router
Rationale:
A router operates at the Network layer (Layer 3) and forwards packets between different
networks based on IP addresses. A repeater (Option B) operates at the Physical layer. A
wire (Option C) is a transmission medium. A switch (Option D) operates at the Data Link
layer (Layer 2).
Foundations Pre-Assessment Study
Guide | Questions with Verified
Answers & Clear Explanations
(Updated)
2026/2027 Frequently Most Tested Questions and 100% Accurate From
Past papers | Graded A+ , Reviewed and Updated | 100% Guarantee
Pass | Latest Exam and Newest Version!!!
QUESTIONS AND ANSWERS
Which OSI layer is related to the function of the IP protocol suite?
a. Transport
b. Network
c. Data Link
d. Session
✔️ Correct Answer: b. Network
Rationale:
The Internet Protocol (IP) operates at the Network layer (Layer 3) of the OSI model. Its
primary function is to provide logical addressing and routing of data packets between
different networks. The Transport layer (Option A) handles end-to-end communication
and error checking. The Data Link layer (Option C) handles physical addressing and frame
delivery. The Session layer (Option D) manages sessions between applications.
,Which OSI layer is responsible for organizing how bits are passed over the physical layer
between devices within the same collision domain?
a. Frame
b. Connection
c. Transport
d. Data Link
✔️ Correct Answer: d. Data Link
Rationale:
The Data Link layer (Layer 2) is responsible for organizing bits into frames and managing
how they are passed over the physical layer within the same collision domain. It also
handles error detection and flow control. The Frame (Option A) is a unit of data at this
layer, not the layer itself. The Connection (Option B) is not an OSI layer. The Transport
layer (Option C) handles end-to-end communication.
Which OSI layer would define the scope of a protocol that makes sure packets of data are
received correctly and resends them if they are not?
a. Validation
b. Transmission
c. Transport
d. Connection
✔️ Correct Answer: c. Transport
Rationale:
The Transport layer (Layer 4) is responsible for ensuring reliable data delivery, including
error checking, sequencing, and retransmission of lost or corrupted packets. Protocols like
TCP operate at this layer. Validation (Option A), Transmission (Option B), and Connection
(Option D) are not OSI layers.
Which protocol suite performs functions of OSI layer 4?
a. IPX
b. MAC
,c. CSMA/CD
d. TCP
✔️ Correct Answer: d. TCP
Rationale:
TCP (Transmission Control Protocol) operates at the Transport layer (Layer 4) of the OSI
model, providing reliable, connection-oriented communication with error checking and
retransmission. IPX (Option A) is a Network layer protocol. MAC (Option B) operates at
the Data Link layer. CSMA/CD (Option C) is a media access control method at the Data
Link layer.
Which type of Ethernet cable can maintain 10 Gbps transmission speeds through the
course of its maximum 100-meter length?
a. CAT 5e
b. CAT 5
c. CAT 3
d. CAT 6a
✔️ Correct Answer: d. CAT 6a
Rationale:
CAT 6a (Category 6 augmented) cable supports 10 Gbps transmission speeds up to its
maximum length of 100 meters. CAT 5e (Option A) supports up to 1 Gbps. CAT 5 (Option
B) supports up to 100 Mbps. CAT 3 (Option C) supports up to 10 Mbps and is obsolete for
modern networking.
Which Internet access technology uses ordinary telephone wires for data transmission?
a. DSL
b. Cable
c. Wi-Fi
d. Hotspot
✔️ Correct Answer: a. DSL
Rationale:
DSL (Digital Subscriber Line) uses ordinary telephone wires for data transmission, allowing
, simultaneous voice and data service. Cable (Option B) uses coaxial cable. Wi-Fi (Option C)
is wireless. Hotspot (Option D) uses cellular or Wi-Fi connections.
Which device is used to organize network cables as they run between switches and other
network devices?
a. Jack
b. Hub
c. Patch Panel
d. Router
✔️ Correct Answer: c. Patch Panel
Rationale:
A patch panel is used to organize and manage network cables, providing a central point
for cable termination and easy reconfiguration. A jack (Option A) is an outlet for
connecting devices. A hub (Option B) forwards signals to all ports. A router (Option D)
connects different networks.
Which network device is used to connect two or more network segments by performing
OSI layer 3 functions like packet-forwarding?
a. Router
b. Repeater
c. Wire
d. Switch
✔️ Correct Answer: a. Router
Rationale:
A router operates at the Network layer (Layer 3) and forwards packets between different
networks based on IP addresses. A repeater (Option B) operates at the Physical layer. A
wire (Option C) is a transmission medium. A switch (Option D) operates at the Data Link
layer (Layer 2).
