Network and Security- Foundations- D315 Exam fully solved
& updated (latest version verified for accuracy) D315 network
and security foundations (Verified Questions and Answers
plus Rationales) LATEST UPDATE 2026
1. What does LAN stand for?
A. Local Area Network
B. Large Area Network
C. Logical Access Network
D. Long Access Network
Answer: A
Rationale: A LAN connects devices in a limited geographic area.
2. Which device forwards packets based on IP addresses?
A. Switch
B. Hub
C. Router
D. Bridge
Answer: C
Rationale: Routers operate at Layer 3 and use IP addresses.
3. Which OSI layer handles encryption?
A. Physical
B. Data Link
C. Session
D. Presentation
Answer: D
Rationale: The Presentation layer manages encryption and data formatting.
4. Which protocol is connection-oriented?
,A. UDP
B. IP
C. TCP
D. ICMP
Answer: C
Rationale: TCP establishes a connection before data transfer.
5. What cable type is immune to electromagnetic interference?
A. UTP
B. STP
C. Coaxial
D. Fiber optic
Answer: D
Rationale: Fiber uses light, not electrical signals.
6. Which topology uses a central connecting device?
A. Bus
B. Ring
C. Mesh
D. Star
Answer: D
Rationale: Star topology connects all devices to a central hub or switch.
7. What does DHCP provide?
A. DNS resolution
B. IP address assignment
C. File sharing
D. Encryption
Answer: B
Rationale: DHCP automatically assigns IP addresses.
, 8. Which protocol resolves IP to MAC addresses?
A. DNS
B. DHCP
C. ARP
D. ICMP
Answer: C
Rationale: ARP maps IP addresses to MAC addresses.
9. Which port does HTTPS use?
A. 21
B. 25
C. 80
D. 443
Answer: D
Rationale: HTTPS uses TCP port 443.
10. What is the function of a switch?
A. Broadcast traffic
B. Filter by IP
C. Filter by MAC address
D. Assign IPs
Answer: C
Rationale: Switches forward frames using MAC addresses.
Domain 2: OSI & TCP/IP Models
11. How many layers are in the OSI model?
A. 4
B. 5
C. 6
D. 7
& updated (latest version verified for accuracy) D315 network
and security foundations (Verified Questions and Answers
plus Rationales) LATEST UPDATE 2026
1. What does LAN stand for?
A. Local Area Network
B. Large Area Network
C. Logical Access Network
D. Long Access Network
Answer: A
Rationale: A LAN connects devices in a limited geographic area.
2. Which device forwards packets based on IP addresses?
A. Switch
B. Hub
C. Router
D. Bridge
Answer: C
Rationale: Routers operate at Layer 3 and use IP addresses.
3. Which OSI layer handles encryption?
A. Physical
B. Data Link
C. Session
D. Presentation
Answer: D
Rationale: The Presentation layer manages encryption and data formatting.
4. Which protocol is connection-oriented?
,A. UDP
B. IP
C. TCP
D. ICMP
Answer: C
Rationale: TCP establishes a connection before data transfer.
5. What cable type is immune to electromagnetic interference?
A. UTP
B. STP
C. Coaxial
D. Fiber optic
Answer: D
Rationale: Fiber uses light, not electrical signals.
6. Which topology uses a central connecting device?
A. Bus
B. Ring
C. Mesh
D. Star
Answer: D
Rationale: Star topology connects all devices to a central hub or switch.
7. What does DHCP provide?
A. DNS resolution
B. IP address assignment
C. File sharing
D. Encryption
Answer: B
Rationale: DHCP automatically assigns IP addresses.
, 8. Which protocol resolves IP to MAC addresses?
A. DNS
B. DHCP
C. ARP
D. ICMP
Answer: C
Rationale: ARP maps IP addresses to MAC addresses.
9. Which port does HTTPS use?
A. 21
B. 25
C. 80
D. 443
Answer: D
Rationale: HTTPS uses TCP port 443.
10. What is the function of a switch?
A. Broadcast traffic
B. Filter by IP
C. Filter by MAC address
D. Assign IPs
Answer: C
Rationale: Switches forward frames using MAC addresses.
Domain 2: OSI & TCP/IP Models
11. How many layers are in the OSI model?
A. 4
B. 5
C. 6
D. 7
