CompTIA Network+ Certification Exam
(N10-009) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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Question 1
Which layer of the OSI model is responsible for logical addressing?
A. Physical
B. Data Link
C. Network
D. Transport
C. Network
The Network layer (Layer 3) is responsible for logical addressing such as IP
addressing and routing between different networks. It determines the best path
for data delivery across interconnected networks using routers.
Question 2
Which protocol is used to automatically assign IP addresses to devices?
A. DNS
B. DHCP
C. ARP
D. FTP
B. DHCP
,Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses,
subnet masks, gateways, and DNS settings to clients, reducing manual
configuration errors and improving scalability in networks.
Question 3
What is the default port number for HTTPS?
A. 80
B. 21
C. 443
D. 22
C. 443
HTTPS uses port 443 to provide secure encrypted communication over TLS/SSL,
ensuring confidentiality and integrity of web traffic between client and server.
Question 4
Which device operates at Layer 2 of the OSI model?
A. Router
B. Switch
C. Firewall
D. Gateway
B. Switch
A switch operates at the Data Link layer and forwards frames based on MAC
addresses, enabling efficient communication within a local network.
Question 5
What does NAT primarily do?
A. Encrypts traffic
,B. Converts domain names
C. Translates private IPs to public IPs
D. Assigns MAC addresses
C. Translates private IPs to public IPs
Network Address Translation (NAT) allows multiple devices on a private network
to share a single public IP address, conserving IPv4 address space and improving
security.
Question 6
Which routing protocol is considered a distance-vector protocol?
A. OSPF
B. BGP
C. RIP
D. IS-IS
C. RIP
Routing Information Protocol (RIP) uses hop count as its metric and is classified
as a distance-vector routing protocol, making it simpler but less scalable than
link-state protocols.
Question 7
What is the purpose of VLANs?
A. Encrypt traffic
B. Increase wireless range
C. Segment broadcast domains
D. Assign IP addresses
C. Segment broadcast domains
VLANs logically divide a physical network into multiple broadcast domains,
improving security, reducing congestion, and enhancing network management.
, Question 8
Which tool is best for testing cable continuity?
A. Wireshark
B. Multimeter
C. Protocol analyzer
D. Netstat
B. Multimeter
A multimeter can test electrical continuity and voltage levels in network cables,
helping identify physical layer faults such as breaks or shorts.
Question 9
Which IPv6 address type is not routable on the internet?
A. Global unicast
B. Link-local
C. Anycast
D. Multicast
B. Link-local
Link-local IPv6 addresses are used for communication within the same network
segment and are not routable beyond the local link.
Question 10
What does DNS translate?
A. MAC to IP
B. IP to MAC
C. Domain names to IP addresses
D. Ports to protocols
(N10-009) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which layer of the OSI model is responsible for logical addressing?
A. Physical
B. Data Link
C. Network
D. Transport
C. Network
The Network layer (Layer 3) is responsible for logical addressing such as IP
addressing and routing between different networks. It determines the best path
for data delivery across interconnected networks using routers.
Question 2
Which protocol is used to automatically assign IP addresses to devices?
A. DNS
B. DHCP
C. ARP
D. FTP
B. DHCP
,Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses,
subnet masks, gateways, and DNS settings to clients, reducing manual
configuration errors and improving scalability in networks.
Question 3
What is the default port number for HTTPS?
A. 80
B. 21
C. 443
D. 22
C. 443
HTTPS uses port 443 to provide secure encrypted communication over TLS/SSL,
ensuring confidentiality and integrity of web traffic between client and server.
Question 4
Which device operates at Layer 2 of the OSI model?
A. Router
B. Switch
C. Firewall
D. Gateway
B. Switch
A switch operates at the Data Link layer and forwards frames based on MAC
addresses, enabling efficient communication within a local network.
Question 5
What does NAT primarily do?
A. Encrypts traffic
,B. Converts domain names
C. Translates private IPs to public IPs
D. Assigns MAC addresses
C. Translates private IPs to public IPs
Network Address Translation (NAT) allows multiple devices on a private network
to share a single public IP address, conserving IPv4 address space and improving
security.
Question 6
Which routing protocol is considered a distance-vector protocol?
A. OSPF
B. BGP
C. RIP
D. IS-IS
C. RIP
Routing Information Protocol (RIP) uses hop count as its metric and is classified
as a distance-vector routing protocol, making it simpler but less scalable than
link-state protocols.
Question 7
What is the purpose of VLANs?
A. Encrypt traffic
B. Increase wireless range
C. Segment broadcast domains
D. Assign IP addresses
C. Segment broadcast domains
VLANs logically divide a physical network into multiple broadcast domains,
improving security, reducing congestion, and enhancing network management.
, Question 8
Which tool is best for testing cable continuity?
A. Wireshark
B. Multimeter
C. Protocol analyzer
D. Netstat
B. Multimeter
A multimeter can test electrical continuity and voltage levels in network cables,
helping identify physical layer faults such as breaks or shorts.
Question 9
Which IPv6 address type is not routable on the internet?
A. Global unicast
B. Link-local
C. Anycast
D. Multicast
B. Link-local
Link-local IPv6 addresses are used for communication within the same network
segment and are not routable beyond the local link.
Question 10
What does DNS translate?
A. MAC to IP
B. IP to MAC
C. Domain names to IP addresses
D. Ports to protocols
