How do TCP and UDP differ in the way that they establish a connection between two endpoints?

TCP uses the three-way handshake, and UDP does not guarantee message delivery.

In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?

A leaf switch can be added with connections to every spine switch.

What identifies the functionality of virtual machines?

The hypervisor virtualizes physical components including CPU, memory, and storage.

What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?

The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN.

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30 Free Cisco CCNA Practice Questions

Real practice questions for the Cisco Cisco Certified Network Associate (CCNA) exam, with answers and detailed explanations. Updated 2026.

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936+ Questions

Below are 30 real practice questions for the Cisco Cisco Certified Network Associate (CCNA) exam. Each question shows the correct answer and a detailed explanation when you reveal it. Use these to benchmark your readiness — if you score below 70% on these 30 questions, plan for at least 4 more weeks of study before booking.

CCNA Practice Questions

FreePracticeQuiz.questionLabelRouting
Refer to the exhibit. Which type of route does R1 use to reach host 10.10.13.10/32?
A
default route
B
network route
C
host route
D
floating static route
FreePracticeQuiz.questionLabelRouting
Refer to the exhibit. Which prefix does Router1 use for traffic to Host A?
A
10.10.10.0/28
B
10.10.13.0/25
C
10.10.13.144/28
D
10.10.13.208/29
FreePracticeQuiz.questionLabelEthernet Switching
A frame that enters a switch fails the Frame Check Sequence. Which two interface counters are incremented? (Choose two.)
A
input errors
B
frame
C
giants
D
CRC
E
runts
FreePracticeQuiz.questionLabelTransport Layer
How do TCP and UDP differ in the way that they establish a connection between two endpoints?
A
TCP uses the three-way handshake, and UDP does not guarantee message delivery.
B
TCP uses synchronization packets, and UDP uses acknowledgment packets.
C
UDP provides reliable message transfer, and TCP is a connectionless protocol.
D
UDP uses SYN, SYN ACK, and FIN bits in the frame header while TCP uses SYN, SYN ACK, and ACK bits.
FreePracticeQuiz.questionLabelWireless Networking
Which 802.11 frame type is Association Response?
A
management
B
protected frame
C
action
D
control
FreePracticeQuiz.questionLabelNetwork Architecture
In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?
A
A spine switch and a leaf switch can be added with redundant connections between them.
B
A spine switch can be added with at least 40 GB uplinks.
C
A leaf switch can be added with connections to every spine switch.
D
A leaf switch can be added with a single connection to a core spine switch.
FreePracticeQuiz.questionLabelVirtualization
What identifies the functionality of virtual machines?
A
The hypervisor communicates on Layer 3 without the need for additional resources.
B
Each hypervisor supports a single virtual machine and a single software switch.
C
The hypervisor virtualizes physical components including CPU, memory, and storage.
D
Virtualized servers run efficiently when physically connected to a switch that is separate from the hypervisor.
FreePracticeQuiz.questionLabelIPv6
Which command automatically generates an IPv6 address from a specified IPv6 prefix and MAC address of an interface?
A
ipv6 address dhcp
B
ipv6 address 2001:DB8:5:112::/64 eui-64
C
ipv6 address autoconfig
D
ipv6 address 2001:DB8:5:112::2/64 link-local
FreePracticeQuiz.questionLabelIPv6
When configuring IPv6 on an interface, which two IPv6 multicast groups are joined? (Choose two.)
A
2000::/3
B
2002::5
C
FC00::/7
D
FF02::1
E
FF02::2
FreePracticeQuiz.questionLabelEthernet Switching
What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?
A
The Layer 2 switch forwards the packet and adds the destination MAC address to its MAC address table.
B
The Layer 2 switch sends a copy of a packet to CPU for destination MAC address learning.
C
The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN.
D
The Layer 2 switch drops the received frame.
FreePracticeQuiz.questionLabelIPv4 Addressing
An engineer must configure a /30 subnet between two routes. Which usable IP address and subnet mask combination meets this criteria?
A
interface e0/0 description to XX-AXXX:XXXXX ip address 10.2.1.3 255.255.255.252
B
interface e0/0 description to XX-AXXX:XXXXX ip address 192.168.1.1 255.255.255.248
C
interface e0/0 description to XX-AXXX:XXXXX ip address 172.16.1.4 255.255.255.248
D
interface e0/0 description to XX-AXXX:XXXXX ip address 209.165.201.2 225.255.255.252
FreePracticeQuiz.questionLabelIPv4 Addressing
Which network allows devices to communicate without the need to access the Internet?
A
172.9.0.0/16
B
172.28.0.0/16
C
192.0.0.0/8
D
209.165.201.0/24
FreePracticeQuiz.questionLabelIPv4 Addressing
Refer to the exhibit. Which statement explains the configuration error message that is received?
A
It belongs to a private IP address range.
B
The router does not support /28 mask.
C
It is a network IP address.
D
It is a broadcast IP address.
FreePracticeQuiz.questionLabelIPv6
Which IPv6 address type provides communication between subnets and cannot route on the Internet?
A
link-local
B
unique local
C
multicast
D
global unicast
FreePracticeQuiz.questionLabelIPv6
Which IPv6 address block sends packets to a group address rather than a single address?
A
2000::/3
B
FC00::/7
C
FE80::/10
D
FF00::/8
FreePracticeQuiz.questionLabelEthernet
What are two reasons that cause late collisions to increment on an Ethernet interface? (Choose two.)
A
when Carrier Sense Multiple Access/Collision Detection is used
B
when one side of the connection is configured for half-duplex
C
when the sending device waits 15 seconds before sending the frame again
D
when a collision occurs after the 32nd byte of a frame has been transmitted
E
when the cable length limits are exceeded
FreePracticeQuiz.questionLabelWireless Networking
What is a benefit of using a Cisco Wireless LAN Controller?
A
It eliminates the need to configure each access point individually.
B
Central AP management requires more complex configurations.
C
Unique SSIDs cannot use the same authentication method.
D
It supports autonomous and lightweight APs.
FreePracticeQuiz.questionLabelNetwork Security
During a routine inspection, a technician discovered that software that was installed on a computer was secretly collecting data about websites that were visited by users of the computer. Which type of threat is affecting this computer?
A
DoS attack
B
identity theft
C
spyware
D
zero-day attack
FreePracticeQuiz.questionLabelNetwork Architecture
Which term refers to a network that provides secure access to the corporate offices by suppliers, customers and collaborators?
A
Internet
B
intranet
C
extranet
D
extendednet
FreePracticeQuiz.questionLabelNetwork Architecture
A large corporation has modified its network to allow users to access network resources from their personal laptops and smart phones. Which networking trend does this describe?
A
cloud computing
B
online collaboration
C
bring your own device
D
video conferencing
FreePracticeQuiz.questionLabelNetwork Architecture
What is an ISP?
A
It is a standards body that develops cabling and wiring standards for networking.
B
It is a protocol that establishes how computers within a local network communicate.
C
It is an organization that enables individuals and businesses to connect to the Internet.
D
It is a networking device that combines the functionality of several different networking devices in one.
FreePracticeQuiz.questionLabelNetwork Architecture
An employee at a branch office is creating a quote for a customer. In order to do this, the employee needs to access confidential pricing information from internal servers at the Head Office. What type of network would the employee access?
A
an intranet
B
the Internet
C
an extranet
D
a local area network
FreePracticeQuiz.questionLabelPhysical Layer
Which statement describes the use of powerline networking technology?
A
New “smart” electrical cabling is used to extend an existing home LAN.
B
A home LAN is installed without the use of physical cabling.
C
A device connects to an existing home LAN using an adapter and an existing electrical outlet.
D
Wireless access points use powerline adapters to distribute data through the home LAN.
FreePracticeQuiz.questionLabelNetwork Security
A networking technician is working on the wireless network at a medical clinic. The technician accidentally sets up the wireless network so that patients can see the medical records data of other patients. Which of the four network characteristics has been violated in this situation?
A
fault tolerance
B
scalability
C
security
D
Quality of Service (QoS)
E
reliability
FreePracticeQuiz.questionLabelPhysical Layer
What two criteria are used to help select a network medium from various network media? (Choose two.)
A
the types of data that need to be prioritized
B
the cost of the end devices utilized in the network
C
the distance the selected medium can successfully carry a signal
D
the number of intermediate devices installed in the network
E
the environment where the selected medium is to be installed
FreePracticeQuiz.questionLabelQoS
What type of network traffic requires QoS?
A
email
B
on-line purchasing
C
video conferencing
D
wiki
FreePracticeQuiz.questionLabelNetwork Security
A user is implementing security on a small office network. Which two actions would provide the minimum security requirements for this network? (Choose two.)
A
implementing a firewall
B
installing a wireless network
C
installing antivirus software
D
implementing an intrusion detection system
E
adding a dedicated intrusion prevention device
FreePracticeQuiz.questionLabelCisco IOS
Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.)
A
VTY interface
B
console interface
C
Ethernet interface
D
boot IOS mode
E
privileged EXEC mode
F
router configuration mode
FreePracticeQuiz.questionLabelEthernet Switching
Which interface allows remote management of a Layer 2 switch?
A
the AUX interface
B
the console port interface
C
the switch virtual interface
D
the first Ethernet port interface
FreePracticeQuiz.questionLabelCisco IOS
What function does pressing the Tab key have when entering a command in IOS?
A
It aborts the current command and returns to configuration mode.
B
It exits configuration mode and returns to user EXEC mode.
C
It moves the cursor to the beginning of the next line.
D
It completes the remainder of a partially typed word in a command.

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Frequently Asked Questions

Are these real CCNA practice questions?+

Yes. These 30 questions are taken directly from our 936+ Questions pool, written and reviewed by certified practitioners. They mirror the style, difficulty, and scope of the official Cisco CCNA exam.

Is the CCNA exam hard?+

The Cisco Cisco Certified Network Associate (CCNA) is considered a pass-mark exam (passing score: 825 out of 1000). Most candidates need 4–8 weeks of focused preparation. Use these free questions to gauge where you stand before committing to a full study plan.

How many questions are on the real CCNA exam?+

The official CCNA exam has 100-120 questions.

Do I need to sign up to use these questions?+

No. These 30 questions are free and require no signup. If you want timed simulation, performance analytics, and access to all 936+ Questions, our paid plans start at $2.99 per exam with credits that never expire.

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30 Free Cisco CCNA Practice Questions

CCNA Practice Questions

Refer to the exhibit. Which type of route does R1 use to reach host 10.10.13.10/32?

Refer to the exhibit. Which prefix does Router1 use for traffic to Host A?

A frame that enters a switch fails the Frame Check Sequence. Which two interface counters are incremented? (Choose two.)

How do TCP and UDP differ in the way that they establish a connection between two endpoints?

Which 802.11 frame type is Association Response?

In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?

What identifies the functionality of virtual machines?

Which command automatically generates an IPv6 address from a specified IPv6 prefix and MAC address of an interface?

When configuring IPv6 on an interface, which two IPv6 multicast groups are joined? (Choose two.)

What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?

An engineer must configure a /30 subnet between two routes. Which usable IP address and subnet mask combination meets this criteria?

Which network allows devices to communicate without the need to access the Internet?

Refer to the exhibit. Which statement explains the configuration error message that is received?

Which IPv6 address type provides communication between subnets and cannot route on the Internet?

Which IPv6 address block sends packets to a group address rather than a single address?

What are two reasons that cause late collisions to increment on an Ethernet interface? (Choose two.)

What is a benefit of using a Cisco Wireless LAN Controller?

During a routine inspection, a technician discovered that software that was installed on a computer was secretly collecting data about websites that were visited by users of the computer. Which type of threat is affecting this computer?

Which term refers to a network that provides secure access to the corporate offices by suppliers, customers and collaborators?

A large corporation has modified its network to allow users to access network resources from their personal laptops and smart phones. Which networking trend does this describe?

What is an ISP?

An employee at a branch office is creating a quote for a customer. In order to do this, the employee needs to access confidential pricing information from internal servers at the Head Office. What type of network would the employee access?

Which statement describes the use of powerline networking technology?

A networking technician is working on the wireless network at a medical clinic. The technician accidentally sets up the wireless network so that patients can see the medical records data of other patients. Which of the four network characteristics has been violated in this situation?

What two criteria are used to help select a network medium from various network media? (Choose two.)

What type of network traffic requires QoS?

A user is implementing security on a small office network. Which two actions would provide the minimum security requirements for this network? (Choose two.)

Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.)

Which interface allows remote management of a Layer 2 switch?

What function does pressing the Tab key have when entering a command in IOS?

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