WGU D412 – Network Analytics and
Troubleshooting Final Prep Exam (Latest
Update 2026/2027) Questions and
Verified Answers | 100% Correct |
Grade A.
1. A network administrator notices intermittent packet loss between
two branch offices connected by a WAN. Which troubleshooting
methodology should be performed first?
A. Replace all WAN routers
B. Review firewall rules
C. Identify and verify the problem
D. Reconfigure routing protocols
Rationale: Effective troubleshooting begins by identifying and verifying
the issue before making configuration changes. Gathering information
from users, logs, and monitoring systems helps determine the actual
scope of the problem and prevents unnecessary changes that could
introduce additional issues.
2. Which command is commonly used to verify Layer 3 connectivity
between two hosts?
,A. arp
B. ping
C. netstat
D. nslookup
Rationale: The ping command uses ICMP Echo Requests and Echo
Replies to verify IP connectivity between hosts. It is one of the most
basic and effective tools for determining whether a remote device is
reachable across the network.
3. Which OSI layer is responsible for logical addressing and routing?
A. Physical
B. Data Link
C. Network
D. Transport
Rationale: The Network layer (Layer 3) provides logical addressing
through IP addresses and determines the best path for data to travel
between networks using routing protocols and routing tables.
4. A switch receives a frame destined for an unknown MAC address.
What will the switch do?
A. Discard the frame immediately
B. Flood the frame out all ports except the incoming port
C. Send the frame to the default gateway
,D. Broadcast an ARP request
Rationale: When a switch does not have the destination MAC address in
its forwarding table, it floods the frame to all ports except the one on
which it was received. Once the destination responds, the switch learns
its MAC address.
5. Which protocol automatically maps IPv4 addresses to MAC
addresses?
A. DNS
B. DHCP
C. ARP
D. ICMP
Rationale: Address Resolution Protocol (ARP) resolves IPv4 addresses
into MAC addresses within a local network segment, enabling Ethernet
communication between devices.
6. What is the primary purpose of a baseline in network monitoring?
A. Encrypt traffic
B. Increase bandwidth
C. Establish normal network performance for comparison
D. Replace logging systems
Rationale: A network baseline represents expected performance during
normal operations. Administrators compare current metrics against the
, baseline to detect anomalies, performance degradation, or security
incidents.
7. Which protocol is primarily used to securely manage network
devices remotely?
A. Telnet
B. SSH
C. FTP
D. HTTP
Rationale: SSH encrypts both authentication credentials and
management traffic, making it the preferred protocol for securely
administering routers, switches, firewalls, and servers.
8. A technician observes increasing latency but no packet loss. Which
metric is being affected?
A. Throughput
B. Response time
C. Availability
D. Port density
Rationale: Latency measures the time required for packets to travel
between devices. High latency affects application responsiveness even
when packets successfully reach their destination.
Troubleshooting Final Prep Exam (Latest
Update 2026/2027) Questions and
Verified Answers | 100% Correct |
Grade A.
1. A network administrator notices intermittent packet loss between
two branch offices connected by a WAN. Which troubleshooting
methodology should be performed first?
A. Replace all WAN routers
B. Review firewall rules
C. Identify and verify the problem
D. Reconfigure routing protocols
Rationale: Effective troubleshooting begins by identifying and verifying
the issue before making configuration changes. Gathering information
from users, logs, and monitoring systems helps determine the actual
scope of the problem and prevents unnecessary changes that could
introduce additional issues.
2. Which command is commonly used to verify Layer 3 connectivity
between two hosts?
,A. arp
B. ping
C. netstat
D. nslookup
Rationale: The ping command uses ICMP Echo Requests and Echo
Replies to verify IP connectivity between hosts. It is one of the most
basic and effective tools for determining whether a remote device is
reachable across the network.
3. Which OSI layer is responsible for logical addressing and routing?
A. Physical
B. Data Link
C. Network
D. Transport
Rationale: The Network layer (Layer 3) provides logical addressing
through IP addresses and determines the best path for data to travel
between networks using routing protocols and routing tables.
4. A switch receives a frame destined for an unknown MAC address.
What will the switch do?
A. Discard the frame immediately
B. Flood the frame out all ports except the incoming port
C. Send the frame to the default gateway
,D. Broadcast an ARP request
Rationale: When a switch does not have the destination MAC address in
its forwarding table, it floods the frame to all ports except the one on
which it was received. Once the destination responds, the switch learns
its MAC address.
5. Which protocol automatically maps IPv4 addresses to MAC
addresses?
A. DNS
B. DHCP
C. ARP
D. ICMP
Rationale: Address Resolution Protocol (ARP) resolves IPv4 addresses
into MAC addresses within a local network segment, enabling Ethernet
communication between devices.
6. What is the primary purpose of a baseline in network monitoring?
A. Encrypt traffic
B. Increase bandwidth
C. Establish normal network performance for comparison
D. Replace logging systems
Rationale: A network baseline represents expected performance during
normal operations. Administrators compare current metrics against the
, baseline to detect anomalies, performance degradation, or security
incidents.
7. Which protocol is primarily used to securely manage network
devices remotely?
A. Telnet
B. SSH
C. FTP
D. HTTP
Rationale: SSH encrypts both authentication credentials and
management traffic, making it the preferred protocol for securely
administering routers, switches, firewalls, and servers.
8. A technician observes increasing latency but no packet loss. Which
metric is being affected?
A. Throughput
B. Response time
C. Availability
D. Port density
Rationale: Latency measures the time required for packets to travel
between devices. High latency affects application responsiveness even
when packets successfully reach their destination.
