WGU D325 – Networks Final Prep Exam
(Latest Update 2026/2027) Questions and
Verified Answers | 100% Correct | Grade A.
Question 1
Which layer of the OSI model is responsible for routing packets between
different networks?
A. Data Link Layer
B. Physical Layer
C. Network Layer
D. Session Layer
Rationale: The Network layer (Layer 3) is responsible for logical
addressing and routing packets between different networks. Devices
such as routers operate primarily at this layer, determining the most
efficient path for data to travel from source to destination.
Question 2
Which protocol is commonly used to automatically assign IP addresses
to devices on a network?
A. DNS
B. FTP
C. DHCP
D. SMTP
,Rationale: Dynamic Host Configuration Protocol (DHCP) automatically
assigns IP addresses and other network configuration settings, reducing
administrative effort and minimizing addressing errors.
Question 3
What is the primary purpose of DNS?
A. Encrypt network traffic
B. Transfer files securely
C. Translate domain names into IP addresses
D. Assign MAC addresses
Rationale: The Domain Name System (DNS) converts human-readable
domain names into IP addresses so computers can locate and
communicate with one another across networks.
Question 4
Which device forwards traffic based on MAC addresses?
A. Router
B. Firewall
C. Switch
D. Gateway
Rationale: A switch operates primarily at Layer 2 of the OSI model and
uses MAC addresses to forward Ethernet frames only to the appropriate
destination port.
,Question 5
Which IPv4 address belongs to the private Class C address range?
A. 11.0.0.1
B. 172.20.0.5
C. 192.168.10.25
D. 209.165.200.225
Rationale: The private Class C range is 192.168.0.0 through
192.168.255.255. These addresses are reserved for private networks
and are not routable on the public Internet.
Question 6
Which protocol securely manages network devices through encrypted
remote sessions?
A. Telnet
B. HTTP
C. FTP
D. SSH
Rationale: Secure Shell (SSH) encrypts communication between client
and server, protecting credentials and administrative commands from
interception.
Question 7
What is the default subnet mask for a Class C IPv4 network?
, A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.252
Rationale: Traditional Class C networks use the default subnet mask
255.255.255.0 (/24), allowing 254 usable host addresses.
Question 8
Which topology connects every device directly to a central switch?
A. Bus
B. Ring
C. Mesh
D. Star
Rationale: In a star topology, all devices connect to a central networking
device. This design simplifies troubleshooting and isolates failures to
individual links.
Question 9
Which command is commonly used to verify basic IP connectivity?
A. netstat
B. tracert
C. ipconfig
D. ping
(Latest Update 2026/2027) Questions and
Verified Answers | 100% Correct | Grade A.
Question 1
Which layer of the OSI model is responsible for routing packets between
different networks?
A. Data Link Layer
B. Physical Layer
C. Network Layer
D. Session Layer
Rationale: The Network layer (Layer 3) is responsible for logical
addressing and routing packets between different networks. Devices
such as routers operate primarily at this layer, determining the most
efficient path for data to travel from source to destination.
Question 2
Which protocol is commonly used to automatically assign IP addresses
to devices on a network?
A. DNS
B. FTP
C. DHCP
D. SMTP
,Rationale: Dynamic Host Configuration Protocol (DHCP) automatically
assigns IP addresses and other network configuration settings, reducing
administrative effort and minimizing addressing errors.
Question 3
What is the primary purpose of DNS?
A. Encrypt network traffic
B. Transfer files securely
C. Translate domain names into IP addresses
D. Assign MAC addresses
Rationale: The Domain Name System (DNS) converts human-readable
domain names into IP addresses so computers can locate and
communicate with one another across networks.
Question 4
Which device forwards traffic based on MAC addresses?
A. Router
B. Firewall
C. Switch
D. Gateway
Rationale: A switch operates primarily at Layer 2 of the OSI model and
uses MAC addresses to forward Ethernet frames only to the appropriate
destination port.
,Question 5
Which IPv4 address belongs to the private Class C address range?
A. 11.0.0.1
B. 172.20.0.5
C. 192.168.10.25
D. 209.165.200.225
Rationale: The private Class C range is 192.168.0.0 through
192.168.255.255. These addresses are reserved for private networks
and are not routable on the public Internet.
Question 6
Which protocol securely manages network devices through encrypted
remote sessions?
A. Telnet
B. HTTP
C. FTP
D. SSH
Rationale: Secure Shell (SSH) encrypts communication between client
and server, protecting credentials and administrative commands from
interception.
Question 7
What is the default subnet mask for a Class C IPv4 network?
, A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.252
Rationale: Traditional Class C networks use the default subnet mask
255.255.255.0 (/24), allowing 254 usable host addresses.
Question 8
Which topology connects every device directly to a central switch?
A. Bus
B. Ring
C. Mesh
D. Star
Rationale: In a star topology, all devices connect to a central networking
device. This design simplifies troubleshooting and isolates failures to
individual links.
Question 9
Which command is commonly used to verify basic IP connectivity?
A. netstat
B. tracert
C. ipconfig
D. ping
