WGU C854 FINAL EXAM STUDY GUIDE
QUESTIONS AND ANSWERS 2026/2027
UPDATE || 100% GUARANTEED PASS
1. Which protocol operates at the Transport Layer and provides connection-oriented, reliable
delivery of data packets?
A. UDP
B. IP
C. TCP
D. ICMP
Answer: C
Conceptual Explanation: TCP is connection-oriented and ensures reliable data delivery
through sequencing and acknowledgments, unlike UDP which is connectionless.
2. A network administrator needs to segment a network to reduce broadcast traffic. Which
device is primarily used for this purpose at Layer 2?
A. Hub
B. Repeater
C. Switch using VLANs
D. Bridge
,Answer: C
Conceptual Explanation: VLANs on a switch allow for the creation of multiple broadcast
domains within a single physical infrastructure, improving efficiency.
3. Which CIDR notation represents a subnet mask of 255.255.255.224?
A. /26
B. /25
C. /28
D. /27
Answer: D
Conceptual Explanation: A /27 mask uses 27 bits for the network portion (8+8+8+3),
where 224 in the last octet corresponds to the first three bits set (128+64+32).
4. In the OSI model, which layer is responsible for logical addressing and determining the best
path for data to travel across networks?
A. Network Layer
B. Data Link Layer
C. Transport Layer
D. Physical Layer
Answer: A
, Conceptual Explanation: The Network Layer (Layer 3) handles IP addressing and routing
decisions between different networks.
5. Which IPv6 address type is intended for communication within a single local link and
always starts with the prefix fe80::/10?
A. Global Unicast
B. Unique Local
C. Link-Local
D. Multicast
Answer: C
Conceptual Explanation: Link-Local addresses are automatically configured on all IPv6
interfaces and are used for communication on the local segment.
6. What is the primary function of the Address Resolution Protocol (ARP)?
A. Assign IP addresses to hosts dynamically
B. Map domain names to IP addresses
C. Map IP addresses to MAC addresses
D. Provide secure shell access to remote devices
Answer: C
Conceptual Explanation: ARP resolves a known IP address to a physical MAC address on a
local area network.
QUESTIONS AND ANSWERS 2026/2027
UPDATE || 100% GUARANTEED PASS
1. Which protocol operates at the Transport Layer and provides connection-oriented, reliable
delivery of data packets?
A. UDP
B. IP
C. TCP
D. ICMP
Answer: C
Conceptual Explanation: TCP is connection-oriented and ensures reliable data delivery
through sequencing and acknowledgments, unlike UDP which is connectionless.
2. A network administrator needs to segment a network to reduce broadcast traffic. Which
device is primarily used for this purpose at Layer 2?
A. Hub
B. Repeater
C. Switch using VLANs
D. Bridge
,Answer: C
Conceptual Explanation: VLANs on a switch allow for the creation of multiple broadcast
domains within a single physical infrastructure, improving efficiency.
3. Which CIDR notation represents a subnet mask of 255.255.255.224?
A. /26
B. /25
C. /28
D. /27
Answer: D
Conceptual Explanation: A /27 mask uses 27 bits for the network portion (8+8+8+3),
where 224 in the last octet corresponds to the first three bits set (128+64+32).
4. In the OSI model, which layer is responsible for logical addressing and determining the best
path for data to travel across networks?
A. Network Layer
B. Data Link Layer
C. Transport Layer
D. Physical Layer
Answer: A
, Conceptual Explanation: The Network Layer (Layer 3) handles IP addressing and routing
decisions between different networks.
5. Which IPv6 address type is intended for communication within a single local link and
always starts with the prefix fe80::/10?
A. Global Unicast
B. Unique Local
C. Link-Local
D. Multicast
Answer: C
Conceptual Explanation: Link-Local addresses are automatically configured on all IPv6
interfaces and are used for communication on the local segment.
6. What is the primary function of the Address Resolution Protocol (ARP)?
A. Assign IP addresses to hosts dynamically
B. Map domain names to IP addresses
C. Map IP addresses to MAC addresses
D. Provide secure shell access to remote devices
Answer: C
Conceptual Explanation: ARP resolves a known IP address to a physical MAC address on a
local area network.
