CompTIA Network+ (N10-009) Certification Exam | Latest Verified Questions and Detailed Answers

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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