WGU D315 EXAM AND STUDY GUIDE LATEST
2026/2027 TEST BANK| NETWORK AND SECURITY
FOUNDATIONS- D315 FINAL EXAM PREP WITH
COMPLETE REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS/ ALREADY GRADED A+
1. Which layer of the OSI model is related to the function of the
IP protocol suite?
A. Transport
B. Network
C. Data Link
D. Session
Correct Answer: B
Rationale: The Network layer (Layer 3) is responsible for logical
addressing and routing, which is where the Internet Protocol (IP)
operates. IP provides the addressing scheme that allows data to
be routed between different networks.
1
,2. 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
Rationale: The Data Link layer (Layer 2) is responsible for
organizing how bits are passed over the physical layer. It frames
data, controls access to the physical medium, and handles error
detection within the same local network segment.
3. 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
2
,C. Transport
D. Connection
Correct Answer: C
Rationale: The Transport layer (Layer 4) is responsible for
ensuring reliable data delivery. TCP operates at this layer and
provides error checking, sequencing, and retransmission of lost
packets.
4. Which protocol suite performs functions of OSI layer 4?
A. IPX
B. MAC
C. CSMA/CD
D. TCP
Correct Answer: D
Rationale: TCP (Transmission Control Protocol) operates at the
Transport layer and provides reliable, connection-oriented
communication. It handles segmentation, sequencing, error
detection, and retransmission of data.
3
, 5. What is the TCP/IP layer that includes the Hypertext Transfer
Protocol (HTTP)?
A. Application
B. Transport
C. Network
D. Data Link
Correct Answer: A
Rationale: HTTP is an application layer protocol in the TCP/IP
model. The Application layer is responsible for communication
protocols between nodes, including protocols like HTTP, HTTPS,
SSH, FTP, and NTP.
6. Which layer of the TCP/IP model includes the Internet
Message Access Protocol (IMAP)?
A. Application
B. Transport
C. Network
D. Network Interface
4
2026/2027 TEST BANK| NETWORK AND SECURITY
FOUNDATIONS- D315 FINAL EXAM PREP WITH
COMPLETE REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS/ ALREADY GRADED A+
1. Which layer of the OSI model is related to the function of the
IP protocol suite?
A. Transport
B. Network
C. Data Link
D. Session
Correct Answer: B
Rationale: The Network layer (Layer 3) is responsible for logical
addressing and routing, which is where the Internet Protocol (IP)
operates. IP provides the addressing scheme that allows data to
be routed between different networks.
1
,2. 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
Rationale: The Data Link layer (Layer 2) is responsible for
organizing how bits are passed over the physical layer. It frames
data, controls access to the physical medium, and handles error
detection within the same local network segment.
3. 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
2
,C. Transport
D. Connection
Correct Answer: C
Rationale: The Transport layer (Layer 4) is responsible for
ensuring reliable data delivery. TCP operates at this layer and
provides error checking, sequencing, and retransmission of lost
packets.
4. Which protocol suite performs functions of OSI layer 4?
A. IPX
B. MAC
C. CSMA/CD
D. TCP
Correct Answer: D
Rationale: TCP (Transmission Control Protocol) operates at the
Transport layer and provides reliable, connection-oriented
communication. It handles segmentation, sequencing, error
detection, and retransmission of data.
3
, 5. What is the TCP/IP layer that includes the Hypertext Transfer
Protocol (HTTP)?
A. Application
B. Transport
C. Network
D. Data Link
Correct Answer: A
Rationale: HTTP is an application layer protocol in the TCP/IP
model. The Application layer is responsible for communication
protocols between nodes, including protocols like HTTP, HTTPS,
SSH, FTP, and NTP.
6. Which layer of the TCP/IP model includes the Internet
Message Access Protocol (IMAP)?
A. Application
B. Transport
C. Network
D. Network Interface
4
