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CompTIA Network+ (N10-009) Certification
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is meticulously designed for the
CompTIA Network+ (N10-009) certification exam, with each question mapped precisely to
the five official domains: Networking Fundamentals (23%), Network Implementations
(20%), Network Operations (19%), Network Security (14%), and Network
Troubleshooting (24%). Covering essential topics such as OSI model layers, IPv4/IPv6
subnetting, routing protocols (BGP, OSPF), virtual networking, SNMP monitoring, Zero
Trust security, IDS/IPS, RADIUS/TACACS+, and command-line troubleshooting tools, these
questions provide a realistic, no-repeat practice experience. Every question includes a
correct answer and a concise expert rationale explaining the “why” behind each answer.
Networking Fundamentals (23%)
QUESTION 1
Which OSI layer is responsible for establishing, managing, and terminating sessions
between applications?
A) Transport
B) Session
C) Presentation
D) Application
CORRECT ANSWER: B
EXPERT RATIONALE: The Session layer (Layer 5) controls dialogues between
applications, managing setup, termination, and synchronization.
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QUESTION 2
A router receives a packet with a destination IP of 192.168.5.45/26. What is the network
address of the subnet?
A) 192.168.5.0
B) 192.168.5.32
C) 192.168.5.64
D) 192.168.5.128
CORRECT ANSWER: A
EXPERT RATIONALE: /26 provides 64 addresses per subnet; 192.168.5.0 is the first
subnet, covering .0–.63, so .45 belongs to .0 network.
QUESTION 3
Which protocol uses UDP and resolves domain names to IP addresses?
A) DNS
B) DHCP
C) SSH
D) HTTP
CORRECT ANSWER: A
EXPERT RATIONALE: DNS primarily uses UDP port 53 for queries, though it falls back to
TCP for zone transfers.
QUESTION 4
A network uses a topology where each node connects to a central device. What is this
topology called?
A) Bus
B) Ring
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C) Star
D) Mesh
CORRECT ANSWER: C
EXPERT RATIONALE: Star topology uses a central switch or hub; all endpoints connect
directly to it.
QUESTION 5
Which IPv6 address type is equivalent to IPv4 broadcast?
A) Unicast
B) Anycast
C) Multicast
D) Global unicast
CORRECT ANSWER: C
EXPERT RATIONALE: IPv6 has no broadcast; multicast to the all-nodes address (FF02::1)
serves similar function.
QUESTION 6
A load balancer performs which primary function in a network?
A) Blocks malicious traffic
B) Distributes traffic across multiple servers
C) Assigns IP addresses dynamically
D) Encrypts data in transit
CORRECT ANSWER: B
EXPERT RATIONALE: Load balancers spread client requests among backend servers to
improve availability and performance.
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QUESTION 7
Which protocol dynamically assigns IP addresses from a pool?
A) DNS
B) ARP
C) DHCP
D) SNMP
CORRECT ANSWER: C
EXPERT RATIONALE: DHCP uses DORA process (Discover, Offer, Request, Acknowledge)
to lease IP configurations to clients.
QUESTION 8
What is the primary function of a firewall in the OSI model?
A) Layer 2 switching
B) Layer 3 routing
C) Filtering traffic based on rules
D) Encapsulating data into frames
CORRECT ANSWER: C
EXPERT RATIONALE: Firewalls operate mainly at Layers 3 and 4 (and newer ones at Layer
7) to permit or deny traffic by policy.
QUESTION 9
Which subnet mask corresponds to a /27 CIDR notation?
A) 255.255.255.128
B) 255.255.255.192
C) 255.255.255.224
D) 255.255.255.240
CompTIA Network+ (N10-009) Certification
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is meticulously designed for the
CompTIA Network+ (N10-009) certification exam, with each question mapped precisely to
the five official domains: Networking Fundamentals (23%), Network Implementations
(20%), Network Operations (19%), Network Security (14%), and Network
Troubleshooting (24%). Covering essential topics such as OSI model layers, IPv4/IPv6
subnetting, routing protocols (BGP, OSPF), virtual networking, SNMP monitoring, Zero
Trust security, IDS/IPS, RADIUS/TACACS+, and command-line troubleshooting tools, these
questions provide a realistic, no-repeat practice experience. Every question includes a
correct answer and a concise expert rationale explaining the “why” behind each answer.
Networking Fundamentals (23%)
QUESTION 1
Which OSI layer is responsible for establishing, managing, and terminating sessions
between applications?
A) Transport
B) Session
C) Presentation
D) Application
CORRECT ANSWER: B
EXPERT RATIONALE: The Session layer (Layer 5) controls dialogues between
applications, managing setup, termination, and synchronization.
,2|Page
QUESTION 2
A router receives a packet with a destination IP of 192.168.5.45/26. What is the network
address of the subnet?
A) 192.168.5.0
B) 192.168.5.32
C) 192.168.5.64
D) 192.168.5.128
CORRECT ANSWER: A
EXPERT RATIONALE: /26 provides 64 addresses per subnet; 192.168.5.0 is the first
subnet, covering .0–.63, so .45 belongs to .0 network.
QUESTION 3
Which protocol uses UDP and resolves domain names to IP addresses?
A) DNS
B) DHCP
C) SSH
D) HTTP
CORRECT ANSWER: A
EXPERT RATIONALE: DNS primarily uses UDP port 53 for queries, though it falls back to
TCP for zone transfers.
QUESTION 4
A network uses a topology where each node connects to a central device. What is this
topology called?
A) Bus
B) Ring
,3|Page
C) Star
D) Mesh
CORRECT ANSWER: C
EXPERT RATIONALE: Star topology uses a central switch or hub; all endpoints connect
directly to it.
QUESTION 5
Which IPv6 address type is equivalent to IPv4 broadcast?
A) Unicast
B) Anycast
C) Multicast
D) Global unicast
CORRECT ANSWER: C
EXPERT RATIONALE: IPv6 has no broadcast; multicast to the all-nodes address (FF02::1)
serves similar function.
QUESTION 6
A load balancer performs which primary function in a network?
A) Blocks malicious traffic
B) Distributes traffic across multiple servers
C) Assigns IP addresses dynamically
D) Encrypts data in transit
CORRECT ANSWER: B
EXPERT RATIONALE: Load balancers spread client requests among backend servers to
improve availability and performance.
, 4|Page
QUESTION 7
Which protocol dynamically assigns IP addresses from a pool?
A) DNS
B) ARP
C) DHCP
D) SNMP
CORRECT ANSWER: C
EXPERT RATIONALE: DHCP uses DORA process (Discover, Offer, Request, Acknowledge)
to lease IP configurations to clients.
QUESTION 8
What is the primary function of a firewall in the OSI model?
A) Layer 2 switching
B) Layer 3 routing
C) Filtering traffic based on rules
D) Encapsulating data into frames
CORRECT ANSWER: C
EXPERT RATIONALE: Firewalls operate mainly at Layers 3 and 4 (and newer ones at Layer
7) to permit or deny traffic by policy.
QUESTION 9
Which subnet mask corresponds to a /27 CIDR notation?
A) 255.255.255.128
B) 255.255.255.192
C) 255.255.255.224
D) 255.255.255.240
