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 OSI layer is responsible for logical addressing?
A. Physical
B. Data Link
C. Network
D. Transport
Correct Answer: C
Rationale: The Network layer (Layer 3) is responsible for logical addressing using
IP addresses (IPv4/IPv6). It also handles routing between different networks,
ensuring packets are forwarded based on destination IP addresses rather than
physical MAC addresses.
Question 2
What device primarily operates at Layer 2 of the OSI model?
A. Router
B. Switch
C. Firewall
D. Modem
,Correct Answer: B
Rationale: A switch operates at the Data Link layer (Layer 2) and uses MAC
addresses to forward frames within a LAN. It builds MAC address tables to
efficiently direct traffic only to the intended destination port.
Question 3
Which protocol is used to automatically assign IP addresses?
A. DNS
B. DHCP
C. ARP
D. FTP
Correct Answer: B
Rationale: DHCP (Dynamic Host Configuration Protocol) automatically assigns IP
addresses, subnet masks, gateways, and DNS settings to clients, reducing
manual configuration errors and administrative overhead.
Question 4
What is the default port for HTTPS?
A. 80
B. 21
C. 443
D. 22
Correct Answer: C
Rationale: HTTPS uses TCP port 443 to provide secure web communication using
SSL/TLS encryption, protecting data between client and server from interception.
,Question 5
Which command is used to test network connectivity?
A. ipconfig
B. traceroute
C. ping
D. netstat
Correct Answer: C
Rationale: The ping command sends ICMP Echo Requests to a target host and
measures response time, verifying connectivity and basic network reachability.
Question 6
What does DNS translate?
A. MAC addresses to IP addresses
B. Domain names to IP addresses
C. IP addresses to MAC addresses
D. Ports to protocols
Correct Answer: B
Rationale: DNS (Domain Name System) resolves human-readable domain names
(like example.com) into IP addresses that computers use to locate services on a
network.
Question 7
Which layer of the OSI model handles encryption and compression?
A. Session
B. Presentation
C. Application
D. Transport
, Correct Answer: B
Rationale: The Presentation layer is responsible for data translation, encryption,
compression, and formatting so that applications can properly interpret received
data.
Question 8
What type of attack floods a system with traffic to disrupt service?
A. Phishing
B. MITM
C. DoS
D. Spoofing
Correct Answer: C
Rationale: A Denial of Service (DoS) attack overwhelms a system with excessive
traffic, exhausting resources and preventing legitimate users from accessing
services.
Question 9
Which IPv4 address is private?
A. 8.8.8.8
B. 192.168.1.1
C. 172.8.8.8
D. 11.0.0.1
Correct Answer: B
Rationale: 192.168.0.0–192.168.255.255 is a private IP range used within local
networks and is not routable on the public internet.
(N10-009) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which OSI layer is responsible for logical addressing?
A. Physical
B. Data Link
C. Network
D. Transport
Correct Answer: C
Rationale: The Network layer (Layer 3) is responsible for logical addressing using
IP addresses (IPv4/IPv6). It also handles routing between different networks,
ensuring packets are forwarded based on destination IP addresses rather than
physical MAC addresses.
Question 2
What device primarily operates at Layer 2 of the OSI model?
A. Router
B. Switch
C. Firewall
D. Modem
,Correct Answer: B
Rationale: A switch operates at the Data Link layer (Layer 2) and uses MAC
addresses to forward frames within a LAN. It builds MAC address tables to
efficiently direct traffic only to the intended destination port.
Question 3
Which protocol is used to automatically assign IP addresses?
A. DNS
B. DHCP
C. ARP
D. FTP
Correct Answer: B
Rationale: DHCP (Dynamic Host Configuration Protocol) automatically assigns IP
addresses, subnet masks, gateways, and DNS settings to clients, reducing
manual configuration errors and administrative overhead.
Question 4
What is the default port for HTTPS?
A. 80
B. 21
C. 443
D. 22
Correct Answer: C
Rationale: HTTPS uses TCP port 443 to provide secure web communication using
SSL/TLS encryption, protecting data between client and server from interception.
,Question 5
Which command is used to test network connectivity?
A. ipconfig
B. traceroute
C. ping
D. netstat
Correct Answer: C
Rationale: The ping command sends ICMP Echo Requests to a target host and
measures response time, verifying connectivity and basic network reachability.
Question 6
What does DNS translate?
A. MAC addresses to IP addresses
B. Domain names to IP addresses
C. IP addresses to MAC addresses
D. Ports to protocols
Correct Answer: B
Rationale: DNS (Domain Name System) resolves human-readable domain names
(like example.com) into IP addresses that computers use to locate services on a
network.
Question 7
Which layer of the OSI model handles encryption and compression?
A. Session
B. Presentation
C. Application
D. Transport
, Correct Answer: B
Rationale: The Presentation layer is responsible for data translation, encryption,
compression, and formatting so that applications can properly interpret received
data.
Question 8
What type of attack floods a system with traffic to disrupt service?
A. Phishing
B. MITM
C. DoS
D. Spoofing
Correct Answer: C
Rationale: A Denial of Service (DoS) attack overwhelms a system with excessive
traffic, exhausting resources and preventing legitimate users from accessing
services.
Question 9
Which IPv4 address is private?
A. 8.8.8.8
B. 192.168.1.1
C. 172.8.8.8
D. 11.0.0.1
Correct Answer: B
Rationale: 192.168.0.0–192.168.255.255 is a private IP range used within local
networks and is not routable on the public internet.
