Cisco CCNA Certification Exam Questions
With Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. Which layer of the OSI model is responsible for logical addressing?
A. Physical
B. Data Link
C. Network
D. Transport
Answer: C
The Network layer handles logical addressing (IP addressing) and
routing between networks.
2. What is the default subnet mask for a Class C IP address?
A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255
Answer: C
Class C networks use 255.255.255.0 as the default subnet mask.
3. Which protocol is used to dynamically assign IP addresses?
A. DNS
,B. DHCP
C. FTP
D. ARP
Answer: B
DHCP automatically assigns IP addresses to devices on a network.
4. What does VLAN stand for?
A. Virtual Link Access Network
B. Virtual Local Area Network
C. Verified LAN Access Node
D. Virtual LAN Adapter Network
Answer: B
VLAN stands for Virtual Local Area Network, used to segment networks
logically.
5. Which device operates at Layer 2 of the OSI model?
A. Router
B. Switch
C. Firewall
D. Gateway
Answer: B
Switches operate at the Data Link layer (Layer 2).
6. What is the purpose of ARP?
A. Resolve MAC to IP
B. Resolve IP to MAC
,C. Assign IP addresses
D. Encrypt traffic
Answer: B
ARP maps IP addresses to MAC addresses.
7. Which protocol is connection-oriented?
A. UDP
B. IP
C. TCP
D. ICMP
Answer: C
TCP provides reliable, connection-oriented communication.
8. What is the function of a router?
A. Forward frames within LAN
B. Filter MAC addresses
C. Route packets between networks
D. Assign MAC addresses
Answer: C
Routers forward packets between different networks.
9. Which command is used to test connectivity in Cisco devices?
A. traceroute
B. ping
C. show ip route
D. ipconfig
, Answer: B
Ping tests network connectivity.
10. Which layer adds port numbers to data?
A. Network
B. Transport
C. Session
D. Presentation
Answer: B
The Transport layer adds port numbers for process-to-process delivery.
11. What is the broadcast address for 192.168.1.0/24?
A. 192.168.1.0
B. 192.168.1.1
C. 192.168.1.255
D. 192.168.0.255
Answer: C
The broadcast address is the last address in the subnet.
12. Which protocol resolves domain names to IP addresses?
A. DHCP
B. DNS
C. FTP
D. SNMP
Answer: B
DNS translates domain names into IP addresses.
With Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which layer of the OSI model is responsible for logical addressing?
A. Physical
B. Data Link
C. Network
D. Transport
Answer: C
The Network layer handles logical addressing (IP addressing) and
routing between networks.
2. What is the default subnet mask for a Class C IP address?
A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255
Answer: C
Class C networks use 255.255.255.0 as the default subnet mask.
3. Which protocol is used to dynamically assign IP addresses?
A. DNS
,B. DHCP
C. FTP
D. ARP
Answer: B
DHCP automatically assigns IP addresses to devices on a network.
4. What does VLAN stand for?
A. Virtual Link Access Network
B. Virtual Local Area Network
C. Verified LAN Access Node
D. Virtual LAN Adapter Network
Answer: B
VLAN stands for Virtual Local Area Network, used to segment networks
logically.
5. Which device operates at Layer 2 of the OSI model?
A. Router
B. Switch
C. Firewall
D. Gateway
Answer: B
Switches operate at the Data Link layer (Layer 2).
6. What is the purpose of ARP?
A. Resolve MAC to IP
B. Resolve IP to MAC
,C. Assign IP addresses
D. Encrypt traffic
Answer: B
ARP maps IP addresses to MAC addresses.
7. Which protocol is connection-oriented?
A. UDP
B. IP
C. TCP
D. ICMP
Answer: C
TCP provides reliable, connection-oriented communication.
8. What is the function of a router?
A. Forward frames within LAN
B. Filter MAC addresses
C. Route packets between networks
D. Assign MAC addresses
Answer: C
Routers forward packets between different networks.
9. Which command is used to test connectivity in Cisco devices?
A. traceroute
B. ping
C. show ip route
D. ipconfig
, Answer: B
Ping tests network connectivity.
10. Which layer adds port numbers to data?
A. Network
B. Transport
C. Session
D. Presentation
Answer: B
The Transport layer adds port numbers for process-to-process delivery.
11. What is the broadcast address for 192.168.1.0/24?
A. 192.168.1.0
B. 192.168.1.1
C. 192.168.1.255
D. 192.168.0.255
Answer: C
The broadcast address is the last address in the subnet.
12. Which protocol resolves domain names to IP addresses?
A. DHCP
B. DNS
C. FTP
D. SNMP
Answer: B
DNS translates domain names into IP addresses.
