WGU D315 Network and Security
Foundations 2026 UPDATED |
Objective Assessment Prep | Most
Tested Concepts + Practice
Questions | PASS FAST|TESTBANK
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!!!
Question:
A network technician is troubleshooting connectivity issues and needs to identify
which OSI layer is responsible for logical addressing and routing. Which OSI layer
corresponds to the Internet Protocol?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: C
Rationale:
The Network Layer (Layer 3) of the OSI model is responsible for logical addressing and
routing. IP (Internet Protocol) operates at this layer, providing logical addresses that
enable packets to be routed across different networks. Layer 1 handles physical
transmission, Layer 2 manages frames and MAC addresses, and Layer 4 handles end-
to-end communication with protocols like TCP and UDP.
,A network administrator is configuring a switch and needs to understand its function
within the OSI model. At which OSI layer does a switch primarily operate?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: B
Rationale:
A switch operates at the Data Link Layer (Layer 2) of the OSI model. It uses MAC
addresses to forward frames within the same network segment. Switches learn MAC
addresses and build forwarding tables to direct traffic efficiently. Unlike routers, which
operate at Layer 3 and use IP addresses, switches function within the same broadcast
domain.
A network technician is explaining the function of a router to a junior colleague. At
which OSI layer does a router primarily operate?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: C
Rationale:
A router operates at the Network Layer (Layer 3) of the OSI model. Routers use logical
addressing (IP addresses) to make forwarding decisions and route packets between
different networks. They maintain routing tables to determine the best path for data
transmission. Switches operate at Layer 2, and hubs operate at Layer 1.
,A network administrator is configuring a wireless access point. At which OSI layer
does a WAP primarily operate?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: B
Rationale:
A Wireless Access Point operates at the Data Link Layer (Layer 2) of the OSI model. It
bridges wireless clients to the wired network using MAC addresses and manages
wireless communication. While it has physical layer components for radio
transmission, its primary function is Layer 2 bridging. It does not perform routing
functions like a Layer 3 device.
A network engineer is explaining the function of the TCP protocol. At which OSI layer
does TCP operate?
a. Session Layer (Layer 5)
b. Transport Layer (Layer 4)
c. Network Layer (Layer 3)
d. Application Layer (Layer 7)
✔️ Correct Answer: B
Rationale:
TCP (Transmission Control Protocol) operates at the Transport Layer (Layer 4) of the
OSI model. It provides reliable, connection-oriented communication with error
checking, sequencing, and acknowledgments. TCP ensures that data is delivered in
order and without errors. UDP also operates at this layer but provides connectionless,
unreliable communication.
, A network technician is identifying network devices and their functions within the OSI
model. Which device operates at the Physical Layer (Layer 1)?
a. Switch
b. Router
c. Hub
d. Firewall
✔️ Correct Answer: C
Rationale:
A hub operates at the Physical Layer (Layer 1) of the OSI model. It simply repeats
signals received on one port to all other ports without any intelligence or addressing.
Hubs are considered obsolete in modern networks due to their inefficiency. Switches
operate at Layer 2, routers at Layer 3, and firewalls typically operate at multiple layers.
A network administrator is explaining OSI model layers to a new technician. Which
device and protocol are associated with the Data Link Layer?
a. Router and IP
b. Switch and Ethernet
c. Hub and physical cabling
d. Firewall and TCP
✔️ Correct Answer: B
Rationale:
The Data Link Layer (Layer 2) is associated with switches and protocols such as
Ethernet and PPP. This layer handles framing, MAC addressing, and error detection.
Switches use MAC addresses to forward frames within a local network. Routers and IP
are Layer 3, hubs are Layer 1, and TCP is Layer 4.
Foundations 2026 UPDATED |
Objective Assessment Prep | Most
Tested Concepts + Practice
Questions | PASS FAST|TESTBANK
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!!!
Question:
A network technician is troubleshooting connectivity issues and needs to identify
which OSI layer is responsible for logical addressing and routing. Which OSI layer
corresponds to the Internet Protocol?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: C
Rationale:
The Network Layer (Layer 3) of the OSI model is responsible for logical addressing and
routing. IP (Internet Protocol) operates at this layer, providing logical addresses that
enable packets to be routed across different networks. Layer 1 handles physical
transmission, Layer 2 manages frames and MAC addresses, and Layer 4 handles end-
to-end communication with protocols like TCP and UDP.
,A network administrator is configuring a switch and needs to understand its function
within the OSI model. At which OSI layer does a switch primarily operate?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: B
Rationale:
A switch operates at the Data Link Layer (Layer 2) of the OSI model. It uses MAC
addresses to forward frames within the same network segment. Switches learn MAC
addresses and build forwarding tables to direct traffic efficiently. Unlike routers, which
operate at Layer 3 and use IP addresses, switches function within the same broadcast
domain.
A network technician is explaining the function of a router to a junior colleague. At
which OSI layer does a router primarily operate?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: C
Rationale:
A router operates at the Network Layer (Layer 3) of the OSI model. Routers use logical
addressing (IP addresses) to make forwarding decisions and route packets between
different networks. They maintain routing tables to determine the best path for data
transmission. Switches operate at Layer 2, and hubs operate at Layer 1.
,A network administrator is configuring a wireless access point. At which OSI layer
does a WAP primarily operate?
a. Physical Layer (Layer 1)
b. Data Link Layer (Layer 2)
c. Network Layer (Layer 3)
d. Transport Layer (Layer 4)
✔️ Correct Answer: B
Rationale:
A Wireless Access Point operates at the Data Link Layer (Layer 2) of the OSI model. It
bridges wireless clients to the wired network using MAC addresses and manages
wireless communication. While it has physical layer components for radio
transmission, its primary function is Layer 2 bridging. It does not perform routing
functions like a Layer 3 device.
A network engineer is explaining the function of the TCP protocol. At which OSI layer
does TCP operate?
a. Session Layer (Layer 5)
b. Transport Layer (Layer 4)
c. Network Layer (Layer 3)
d. Application Layer (Layer 7)
✔️ Correct Answer: B
Rationale:
TCP (Transmission Control Protocol) operates at the Transport Layer (Layer 4) of the
OSI model. It provides reliable, connection-oriented communication with error
checking, sequencing, and acknowledgments. TCP ensures that data is delivered in
order and without errors. UDP also operates at this layer but provides connectionless,
unreliable communication.
, A network technician is identifying network devices and their functions within the OSI
model. Which device operates at the Physical Layer (Layer 1)?
a. Switch
b. Router
c. Hub
d. Firewall
✔️ Correct Answer: C
Rationale:
A hub operates at the Physical Layer (Layer 1) of the OSI model. It simply repeats
signals received on one port to all other ports without any intelligence or addressing.
Hubs are considered obsolete in modern networks due to their inefficiency. Switches
operate at Layer 2, routers at Layer 3, and firewalls typically operate at multiple layers.
A network administrator is explaining OSI model layers to a new technician. Which
device and protocol are associated with the Data Link Layer?
a. Router and IP
b. Switch and Ethernet
c. Hub and physical cabling
d. Firewall and TCP
✔️ Correct Answer: B
Rationale:
The Data Link Layer (Layer 2) is associated with switches and protocols such as
Ethernet and PPP. This layer handles framing, MAC addressing, and error detection.
Switches use MAC addresses to forward frames within a local network. Routers and IP
are Layer 3, hubs are Layer 1, and TCP is Layer 4.
