WGU D412 NETWORK ANALYTICS &
TROUBLESHOOTING 350 PRACTICE EXAM
QUESTIONS WITH ANSWERS AND
RATIONALES
SECTION A: OSI Model & Networking Foundations (Questions 1–50)
Question 1
A user cannot get to any websites but can ping other computers on the same
local network. What is the most likely problem?
A) The network cable is unplugged from the back of the computer
B) The default gateway address is configured incorrectly on the computer
C) The computer's power supply is failing
D) The monitor is not displaying the correct network settings
Correct Answer: B
Rationale: When a user can communicate with local computers but not
external websites, the default gateway is usually misconfigured. The gateway
is the router that sends traffic outside the local network, so an incorrect
gateway setting prevents all outside access.
,Question 2
Your computer shows an IP address of 169.254.15.22 without you setting it
yourself. What does this tell you?
A) Your computer has successfully connected to the Internet
B) Your computer cannot find a DHCP server to give it an address
C) Your computer is using a static IP address configured by an administrator
D) Your computer has a virus that changed its network settings
Correct Answer: B
Rationale: The 169.254.x.x address range is APIPA (Automatic Private IP
Addressing). Windows assigns this address when it cannot find a DHCP
server, allowing local communication but preventing Internet access.
Question 3
A network technician fixes a network problem by replacing a bad network
cable. What should the technician do immediately after the problem is fixed?
A) Go to the next trouble ticket without doing anything else
B) Verify that the user can now access network resources and document the
fix
C) Throw away the old cable immediately without recording what happened
D) Restart all the computers on the network
Correct Answer: B
,Rationale: After implementing a fix, the technician must verify functionality
and document the solution. This ensures the problem is truly resolved and
creates a record for future reference.
Question 4
Which OSI layer is responsible for organizing how bits are passed over the
physical layer between devices within the same network?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Correct Answer: B
Rationale: The Data Link Layer (Layer 2) organizes bits into frames and
manages nodetonode delivery, error detection, and flow control over the
physical medium.
Question 5
What is the main purpose of DNS in a network?
A) Assign IP addresses
B) Translate domain names to IP addresses
C) Route packets between networks
D) Encrypt network traffic
, Correct Answer: B
Rationale: DNS (Domain Name System) resolves humanfriendly domain
names (like www.example.com) to IP addresses that computers use for
communication.
Question 6
Which protocol is responsible for dynamic IP address assignment?
A) DNS
B) DHCP
C) HTTP
D) SSH
Correct Answer: B
Rationale: DHCP (Dynamic Host Configuration Protocol) dynamically assigns
IPv4 and IPv6 addresses to hosts on a network, along with other configuration
parameters.
Question 7
A subnet mask of 255.255.255.0 indicates a network with how many usable
host addresses?
A) 254
B) 256
TROUBLESHOOTING 350 PRACTICE EXAM
QUESTIONS WITH ANSWERS AND
RATIONALES
SECTION A: OSI Model & Networking Foundations (Questions 1–50)
Question 1
A user cannot get to any websites but can ping other computers on the same
local network. What is the most likely problem?
A) The network cable is unplugged from the back of the computer
B) The default gateway address is configured incorrectly on the computer
C) The computer's power supply is failing
D) The monitor is not displaying the correct network settings
Correct Answer: B
Rationale: When a user can communicate with local computers but not
external websites, the default gateway is usually misconfigured. The gateway
is the router that sends traffic outside the local network, so an incorrect
gateway setting prevents all outside access.
,Question 2
Your computer shows an IP address of 169.254.15.22 without you setting it
yourself. What does this tell you?
A) Your computer has successfully connected to the Internet
B) Your computer cannot find a DHCP server to give it an address
C) Your computer is using a static IP address configured by an administrator
D) Your computer has a virus that changed its network settings
Correct Answer: B
Rationale: The 169.254.x.x address range is APIPA (Automatic Private IP
Addressing). Windows assigns this address when it cannot find a DHCP
server, allowing local communication but preventing Internet access.
Question 3
A network technician fixes a network problem by replacing a bad network
cable. What should the technician do immediately after the problem is fixed?
A) Go to the next trouble ticket without doing anything else
B) Verify that the user can now access network resources and document the
fix
C) Throw away the old cable immediately without recording what happened
D) Restart all the computers on the network
Correct Answer: B
,Rationale: After implementing a fix, the technician must verify functionality
and document the solution. This ensures the problem is truly resolved and
creates a record for future reference.
Question 4
Which OSI layer is responsible for organizing how bits are passed over the
physical layer between devices within the same network?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Correct Answer: B
Rationale: The Data Link Layer (Layer 2) organizes bits into frames and
manages nodetonode delivery, error detection, and flow control over the
physical medium.
Question 5
What is the main purpose of DNS in a network?
A) Assign IP addresses
B) Translate domain names to IP addresses
C) Route packets between networks
D) Encrypt network traffic
, Correct Answer: B
Rationale: DNS (Domain Name System) resolves humanfriendly domain
names (like www.example.com) to IP addresses that computers use for
communication.
Question 6
Which protocol is responsible for dynamic IP address assignment?
A) DNS
B) DHCP
C) HTTP
D) SSH
Correct Answer: B
Rationale: DHCP (Dynamic Host Configuration Protocol) dynamically assigns
IPv4 and IPv6 addresses to hosts on a network, along with other configuration
parameters.
Question 7
A subnet mask of 255.255.255.0 indicates a network with how many usable
host addresses?
A) 254
B) 256
