WGU D315 NETWORK AND SECURITY EXAM 2026 QUESTIONS AND ANSWERS ALREADY GRADED A+. 100%
Verified Solutions | Updated Per Latest Guidelines | Graded A+
CORE DOMAINS
Networking Fundamentals and Concepts
Network Protocols and Communication
Network Infrastructure and Devices
Network Security Principles
Threats and Vulnerabilities
Cryptography and Authentication
Network Access Control
Security Operations and Risk Management
INTRODUCTION
This comprehensive network and security examination is designed to assess the candidate's understanding of
fundamental networking concepts, protocols, and security principles. It emphasizes the application of technical
knowledge to real-world scenarios, requiring the synthesis of information across network layers, security controls,
and risk management strategies. The examination evaluates the candidate's ability to analyze network
architectures, identify vulnerabilities, implement security measures, and troubleshoot network issues. This rigorous
,assessment mirrors the complexity of modern network environments and is structured to reflect the official WGU
D315 examination blueprint, preparing candidates for professional networking and security certifications.
SECTION ONE
Questions 1–100
Question 1
A network administrator is configuring a new router and needs to assign an IP address to the interface. Which
of the following IP addresses is a valid private IP address that can be used for internal network communication?
A. 172.16.0.1
B. 192.168.256.1
C. 10.0.0.0
D. 169.254.100.1
🟢 Correct Answer:
A. 172.16.0.1
🔴 RATIONALE:
172.16.0.1 is a valid private IP address within the Class B private address range (172.16.0.0 to 172.31.255.255).
,192.168.256.1 is invalid because 256 exceeds the maximum octet value of 255. 10.0.0.0 is a network address, not
a host address. 169.254.100.1 is an Automatic Private IP Addressing (APIPA) address, which is used when DHCP
fails but is not a designated private address space for internal use.
Question 2
Which of the following protocols is responsible for resolving IP addresses to MAC addresses on a local network?
A. DNS
B. ARP
C. DHCP
D. ICMP
🟢 Correct Answer:
B. ARP
🔴 RATIONALE:
The Address Resolution Protocol (ARP) is used to map an IP address to a physical MAC address on a local
network segment. DNS resolves hostnames to IP addresses. DHCP assigns IP addresses dynamically. ICMP is
used for error reporting and diagnostic functions.
Question 3
, A company is implementing a firewall to protect its internal network from external threats. Which of the
following firewall types operates at the network layer and filters traffic based on source and destination IP
addresses and ports?
A. Application firewall
B. Circuit-level gateway
C. Packet-filtering firewall
D. Stateful inspection firewall
🟢 Correct Answer:
C. Packet-filtering firewall
🔴 RATIONALE:
A packet-filtering firewall operates at Layer 3 (network layer) and makes decisions based on source and
destination IP addresses, ports, and protocols. Application firewalls operate at Layer 7 and inspect application-
layer data. Circuit-level gateways work at the session layer; stateful inspection firewalls track the state of
connections but are more advanced than basic packet filtering.
Question 4
A network technician is troubleshooting a connectivity issue. The technician pings the default gateway and
receives a reply, but pinging a server on a different subnet fails. Which of the following is the most likely cause
of the problem?
Verified Solutions | Updated Per Latest Guidelines | Graded A+
CORE DOMAINS
Networking Fundamentals and Concepts
Network Protocols and Communication
Network Infrastructure and Devices
Network Security Principles
Threats and Vulnerabilities
Cryptography and Authentication
Network Access Control
Security Operations and Risk Management
INTRODUCTION
This comprehensive network and security examination is designed to assess the candidate's understanding of
fundamental networking concepts, protocols, and security principles. It emphasizes the application of technical
knowledge to real-world scenarios, requiring the synthesis of information across network layers, security controls,
and risk management strategies. The examination evaluates the candidate's ability to analyze network
architectures, identify vulnerabilities, implement security measures, and troubleshoot network issues. This rigorous
,assessment mirrors the complexity of modern network environments and is structured to reflect the official WGU
D315 examination blueprint, preparing candidates for professional networking and security certifications.
SECTION ONE
Questions 1–100
Question 1
A network administrator is configuring a new router and needs to assign an IP address to the interface. Which
of the following IP addresses is a valid private IP address that can be used for internal network communication?
A. 172.16.0.1
B. 192.168.256.1
C. 10.0.0.0
D. 169.254.100.1
🟢 Correct Answer:
A. 172.16.0.1
🔴 RATIONALE:
172.16.0.1 is a valid private IP address within the Class B private address range (172.16.0.0 to 172.31.255.255).
,192.168.256.1 is invalid because 256 exceeds the maximum octet value of 255. 10.0.0.0 is a network address, not
a host address. 169.254.100.1 is an Automatic Private IP Addressing (APIPA) address, which is used when DHCP
fails but is not a designated private address space for internal use.
Question 2
Which of the following protocols is responsible for resolving IP addresses to MAC addresses on a local network?
A. DNS
B. ARP
C. DHCP
D. ICMP
🟢 Correct Answer:
B. ARP
🔴 RATIONALE:
The Address Resolution Protocol (ARP) is used to map an IP address to a physical MAC address on a local
network segment. DNS resolves hostnames to IP addresses. DHCP assigns IP addresses dynamically. ICMP is
used for error reporting and diagnostic functions.
Question 3
, A company is implementing a firewall to protect its internal network from external threats. Which of the
following firewall types operates at the network layer and filters traffic based on source and destination IP
addresses and ports?
A. Application firewall
B. Circuit-level gateway
C. Packet-filtering firewall
D. Stateful inspection firewall
🟢 Correct Answer:
C. Packet-filtering firewall
🔴 RATIONALE:
A packet-filtering firewall operates at Layer 3 (network layer) and makes decisions based on source and
destination IP addresses, ports, and protocols. Application firewalls operate at Layer 7 and inspect application-
layer data. Circuit-level gateways work at the session layer; stateful inspection firewalls track the state of
connections but are more advanced than basic packet filtering.
Question 4
A network technician is troubleshooting a connectivity issue. The technician pings the default gateway and
receives a reply, but pinging a server on a different subnet fails. Which of the following is the most likely cause
of the problem?
