COMPTIA NETWORK+ CERTIFICATION EXAM
PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
1. What is the primary function of a router in a network?
A) Connect multiple devices in the same network
B) Forward packets between different networks
C) Store and forward emails
D) Encrypt network traffic
B) Forward packets between different networks
Routers operate at Layer 3 (Network Layer) and are responsible for
routing traffic between different IP networks.
2. Which layer of the OSI model is responsible for reliable end-to-
end communication?
A) Physical
B) Network
C) Transport
D) Data Link
C) Transport
The Transport layer (Layer 4) ensures error checking and reliable data
delivery using protocols like TCP.
3. Which type of IP address is 192.168.1.10?
A) Public IPv4
B) Private IPv4
, C) Public IPv6
D) Link-local IPv6
B) Private IPv4
192.168.x.x addresses are reserved for private networks and are not
routable on the public internet.
4. What protocol is used to automatically assign IP addresses to
hosts on a network?
A) DNS
B) DHCP
C) FTP
D) SMTP
B) DHCP
Dynamic Host Configuration Protocol (DHCP) automatically assigns IP
addresses and other network configuration parameters.
5. Which cable type is used to connect a computer directly to a
switch port?
A) Crossover
B) Straight-through
C) Coaxial
D) Fiber
B) Straight-through
Straight-through cables connect end devices to network devices like
switches, hubs, or routers.
6. Which device operates primarily at the Data Link layer and uses
MAC addresses?
A) Router
B) Switch
, C) Hub
D) Firewall
B) Switch
Switches forward frames based on MAC addresses and operate at Layer
2 of the OSI model.
7. Which of the following IP addresses is valid for a host on a subnet
192.168.10.0/24?
A) 192.168.10.0
B) 192.168.10.255
C) 192.168.10.50
D) 192.168.11.1
C) 192.168.10.50
The network address (.0) and broadcast address (.255) cannot be
assigned to hosts.
8. Which protocol translates domain names to IP addresses?
A) FTP
B) DHCP
C) DNS
D) SNMP
C) DNS
Domain Name System (DNS) resolves human-readable hostnames into
IP addresses.
9. What is the purpose of a VLAN?
A) Extend the network over long distances
B) Segment a physical network into logical networks
C) Provide IP addressing
D) Encrypt network traffic
, B) Segment a physical network into logical networks
VLANs allow logical separation of networks on the same physical switch
to reduce broadcast traffic.
10. Which of the following is a Class B private IP address?
A) 10.1.1.1
B) 172.16.5.10
C) 192.168.1.1
D) 224.0.0.1
B) 172.16.5.10
172.16.0.0 – 172.31.255.255 is reserved for private Class B networks.
11. Which type of attack involves intercepting and modifying
traffic between two parties without their knowledge?
A) DDoS
B) Man-in-the-middle
C) Phishing
D) Spoofing
B) Man-in-the-middle
In a MITM attack, the attacker secretly relays or alters communication
between two parties.
12. What is the default port for HTTPS traffic?
A) 21
B) 80
C) 443
D) 25
C) 443
HTTPS uses port 443 to securely transmit web traffic using SSL/TLS
encryption.
PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
1. What is the primary function of a router in a network?
A) Connect multiple devices in the same network
B) Forward packets between different networks
C) Store and forward emails
D) Encrypt network traffic
B) Forward packets between different networks
Routers operate at Layer 3 (Network Layer) and are responsible for
routing traffic between different IP networks.
2. Which layer of the OSI model is responsible for reliable end-to-
end communication?
A) Physical
B) Network
C) Transport
D) Data Link
C) Transport
The Transport layer (Layer 4) ensures error checking and reliable data
delivery using protocols like TCP.
3. Which type of IP address is 192.168.1.10?
A) Public IPv4
B) Private IPv4
, C) Public IPv6
D) Link-local IPv6
B) Private IPv4
192.168.x.x addresses are reserved for private networks and are not
routable on the public internet.
4. What protocol is used to automatically assign IP addresses to
hosts on a network?
A) DNS
B) DHCP
C) FTP
D) SMTP
B) DHCP
Dynamic Host Configuration Protocol (DHCP) automatically assigns IP
addresses and other network configuration parameters.
5. Which cable type is used to connect a computer directly to a
switch port?
A) Crossover
B) Straight-through
C) Coaxial
D) Fiber
B) Straight-through
Straight-through cables connect end devices to network devices like
switches, hubs, or routers.
6. Which device operates primarily at the Data Link layer and uses
MAC addresses?
A) Router
B) Switch
, C) Hub
D) Firewall
B) Switch
Switches forward frames based on MAC addresses and operate at Layer
2 of the OSI model.
7. Which of the following IP addresses is valid for a host on a subnet
192.168.10.0/24?
A) 192.168.10.0
B) 192.168.10.255
C) 192.168.10.50
D) 192.168.11.1
C) 192.168.10.50
The network address (.0) and broadcast address (.255) cannot be
assigned to hosts.
8. Which protocol translates domain names to IP addresses?
A) FTP
B) DHCP
C) DNS
D) SNMP
C) DNS
Domain Name System (DNS) resolves human-readable hostnames into
IP addresses.
9. What is the purpose of a VLAN?
A) Extend the network over long distances
B) Segment a physical network into logical networks
C) Provide IP addressing
D) Encrypt network traffic
, B) Segment a physical network into logical networks
VLANs allow logical separation of networks on the same physical switch
to reduce broadcast traffic.
10. Which of the following is a Class B private IP address?
A) 10.1.1.1
B) 172.16.5.10
C) 192.168.1.1
D) 224.0.0.1
B) 172.16.5.10
172.16.0.0 – 172.31.255.255 is reserved for private Class B networks.
11. Which type of attack involves intercepting and modifying
traffic between two parties without their knowledge?
A) DDoS
B) Man-in-the-middle
C) Phishing
D) Spoofing
B) Man-in-the-middle
In a MITM attack, the attacker secretly relays or alters communication
between two parties.
12. What is the default port for HTTPS traffic?
A) 21
B) 80
C) 443
D) 25
C) 443
HTTPS uses port 443 to securely transmit web traffic using SSL/TLS
encryption.
