CompTIA Network+ Certification Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A network administrator is designing a small office network that
requires reliable local communication between 25 devices, file sharing,
and internet access through a single ISP connection. Which network
topology is most appropriate for balancing simplicity, scalability, and
fault isolation in this scenario?
A. Bus topology
B. Ring topology
C. Star topology
D. Mesh topology
C
A star topology is most appropriate because it provides centralized
management through a switch, simplifies troubleshooting, supports
easy device addition, and isolates individual device failures without
affecting the entire network.
2. A technician is troubleshooting intermittent connectivity issues where
devices can sometimes reach local resources but frequently fail to
access external websites. DNS resolution appears inconsistent. What is
the most likely cause?
A. Incorrect subnet mask
B. DNS server misconfiguration
C. Duplex mismatch on switch ports
D. ARP cache poisoning
, B
DNS server misconfiguration can cause inconsistent name resolution,
leading to intermittent failures when translating domain names into
IP addresses, while local connectivity remains unaffected.
3. Which OSI model layer is responsible for logical addressing and routing
between different networks?
A. Data Link layer
B. Network layer
C. Transport layer
D. Session layer
B
The Network layer is responsible for logical addressing using IP
addresses and determining routing paths between different
networks.
4. A company wants to segment its internal network into multiple logical
networks without physically separating hardware. Which technology
should be implemented?
A. NAT
B. VLAN
C. VPN
D. DHCP
B
A VLAN allows logical segmentation of a physical network, improving
security, performance, and broadcast control without requiring
separate hardware.
5. Which protocol is primarily used for secure remote command-line
access to network devices?
A. Telnet
B. FTP
C. SSH
D. SNMP
C
SSH provides encrypted remote access to network devices, ensuring
confidentiality and integrity compared to unencrypted alternatives
like Telnet.
,6. A user reports inability to access websites using domain names, but IP
addresses work correctly. What is the most likely issue?
A. Gateway failure
B. DNS resolution failure
C. DHCP lease expiration
D. MAC address conflict
B
If IP addresses work but domain names do not, the issue is typically
DNS resolution failure preventing name-to-IP translation.
7. Which device operates primarily at OSI Layer 2 and uses MAC
addresses to forward traffic?
A. Router
B. Switch
C. Gateway
D. Firewall
B
A switch operates at Layer 2, forwarding frames based on MAC
address tables to efficiently direct local network traffic.
8. A network engineer needs to prevent unauthorized devices from
connecting to switch ports by binding MAC addresses to specific ports.
Which feature should be enabled?
A. Port mirroring
B. Port security
C. Spanning Tree Protocol
D. VLAN tagging
B
Port security restricts access by limiting or binding MAC addresses to
switch ports, preventing unauthorized device connections.
9. Which IPv4 address class is reserved for multicast traffic?
A. Class A
B. Class B
C. Class C
D. Class D
D
Class D addresses are reserved specifically for multicast
, communication, allowing data transmission to multiple hosts
simultaneously.
10. A technician is configuring a network and notices broadcast
storms occurring due to redundant links. Which protocol should be
implemented to prevent loops?
A. RIP
B. OSPF
C. STP
D. DHCP
C
Spanning Tree Protocol (STP) prevents Layer 2 loops by disabling
redundant paths while maintaining network redundancy.
11. Which port number is commonly used for HTTPS traffic?
A. 21
B. 80
C. 443
D. 110
C
HTTPS uses port 443 to provide secure encrypted web communication
using TLS/SSL protocols.
12. A network administrator wants to assign IP addresses
automatically to devices on the network. Which service should be
used?
A. DNS
B. DHCP
C. ARP
D. NAT
B
DHCP automatically assigns IP addresses and network configuration
parameters to devices on a network.
13. Which protocol is used to translate IP addresses into MAC
addresses on a local network?
A. DNS
B. ARP
C. ICMP
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A network administrator is designing a small office network that
requires reliable local communication between 25 devices, file sharing,
and internet access through a single ISP connection. Which network
topology is most appropriate for balancing simplicity, scalability, and
fault isolation in this scenario?
A. Bus topology
B. Ring topology
C. Star topology
D. Mesh topology
C
A star topology is most appropriate because it provides centralized
management through a switch, simplifies troubleshooting, supports
easy device addition, and isolates individual device failures without
affecting the entire network.
2. A technician is troubleshooting intermittent connectivity issues where
devices can sometimes reach local resources but frequently fail to
access external websites. DNS resolution appears inconsistent. What is
the most likely cause?
A. Incorrect subnet mask
B. DNS server misconfiguration
C. Duplex mismatch on switch ports
D. ARP cache poisoning
, B
DNS server misconfiguration can cause inconsistent name resolution,
leading to intermittent failures when translating domain names into
IP addresses, while local connectivity remains unaffected.
3. Which OSI model layer is responsible for logical addressing and routing
between different networks?
A. Data Link layer
B. Network layer
C. Transport layer
D. Session layer
B
The Network layer is responsible for logical addressing using IP
addresses and determining routing paths between different
networks.
4. A company wants to segment its internal network into multiple logical
networks without physically separating hardware. Which technology
should be implemented?
A. NAT
B. VLAN
C. VPN
D. DHCP
B
A VLAN allows logical segmentation of a physical network, improving
security, performance, and broadcast control without requiring
separate hardware.
5. Which protocol is primarily used for secure remote command-line
access to network devices?
A. Telnet
B. FTP
C. SSH
D. SNMP
C
SSH provides encrypted remote access to network devices, ensuring
confidentiality and integrity compared to unencrypted alternatives
like Telnet.
,6. A user reports inability to access websites using domain names, but IP
addresses work correctly. What is the most likely issue?
A. Gateway failure
B. DNS resolution failure
C. DHCP lease expiration
D. MAC address conflict
B
If IP addresses work but domain names do not, the issue is typically
DNS resolution failure preventing name-to-IP translation.
7. Which device operates primarily at OSI Layer 2 and uses MAC
addresses to forward traffic?
A. Router
B. Switch
C. Gateway
D. Firewall
B
A switch operates at Layer 2, forwarding frames based on MAC
address tables to efficiently direct local network traffic.
8. A network engineer needs to prevent unauthorized devices from
connecting to switch ports by binding MAC addresses to specific ports.
Which feature should be enabled?
A. Port mirroring
B. Port security
C. Spanning Tree Protocol
D. VLAN tagging
B
Port security restricts access by limiting or binding MAC addresses to
switch ports, preventing unauthorized device connections.
9. Which IPv4 address class is reserved for multicast traffic?
A. Class A
B. Class B
C. Class C
D. Class D
D
Class D addresses are reserved specifically for multicast
, communication, allowing data transmission to multiple hosts
simultaneously.
10. A technician is configuring a network and notices broadcast
storms occurring due to redundant links. Which protocol should be
implemented to prevent loops?
A. RIP
B. OSPF
C. STP
D. DHCP
C
Spanning Tree Protocol (STP) prevents Layer 2 loops by disabling
redundant paths while maintaining network redundancy.
11. Which port number is commonly used for HTTPS traffic?
A. 21
B. 80
C. 443
D. 110
C
HTTPS uses port 443 to provide secure encrypted web communication
using TLS/SSL protocols.
12. A network administrator wants to assign IP addresses
automatically to devices on the network. Which service should be
used?
A. DNS
B. DHCP
C. ARP
D. NAT
B
DHCP automatically assigns IP addresses and network configuration
parameters to devices on a network.
13. Which protocol is used to translate IP addresses into MAC
addresses on a local network?
A. DNS
B. ARP
C. ICMP
