CCNA Cisco Certified Network
Associate (CCNA) certification
Practice Exam 1 QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2025
1. What layer of the OSI model is responsible for end-to-end delivery
and error recovery?
a) Data Link
b) Network
c) Transport
d) Session
Rationale: The Transport layer (Layer 4) ensures end-to-end
communication, error detection, and recovery.
2. Which of the following is a private IP address?
,a) 8.8.8.8
b) 172.16.0.1
c) 192.168.1.300
d) 10.0.0.5
Rationale: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are private IP
ranges.
3. What command displays the IP routing table on a Cisco router?
a) show ip interface
b) show ip route
c) show interfaces
d) show ip protocols
Rationale: show ip route displays the routing table.
4. Which protocol is used to automatically assign IP addresses on a
network?
a) FTP
b) DNS
c) DHCP
d) ARP
Rationale: DHCP dynamically assigns IP addresses to hosts.
, 5. What does the acronym VLAN stand for?
a) Virtual Local Access Network
b) Virtual LAN Access Node
c) Virtual Local Area Network
d) Virtual LAN Aggregation Network
Rationale: VLAN stands for Virtual Local Area Network.
6. Which device operates at Layer 2 of the OSI model?
a) Router
b) Switch
c) Hub
d) Firewall
Rationale: Switches operate at Layer 2 (Data Link Layer).
7. What protocol resolves IP addresses to MAC addresses?
a) DNS
b) ICMP
c) ARP
d) FTP
Rationale: ARP resolves IPv4 addresses to MAC addresses.
8. What is the default administrative distance of OSPF?
Associate (CCNA) certification
Practice Exam 1 QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2025
1. What layer of the OSI model is responsible for end-to-end delivery
and error recovery?
a) Data Link
b) Network
c) Transport
d) Session
Rationale: The Transport layer (Layer 4) ensures end-to-end
communication, error detection, and recovery.
2. Which of the following is a private IP address?
,a) 8.8.8.8
b) 172.16.0.1
c) 192.168.1.300
d) 10.0.0.5
Rationale: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are private IP
ranges.
3. What command displays the IP routing table on a Cisco router?
a) show ip interface
b) show ip route
c) show interfaces
d) show ip protocols
Rationale: show ip route displays the routing table.
4. Which protocol is used to automatically assign IP addresses on a
network?
a) FTP
b) DNS
c) DHCP
d) ARP
Rationale: DHCP dynamically assigns IP addresses to hosts.
, 5. What does the acronym VLAN stand for?
a) Virtual Local Access Network
b) Virtual LAN Access Node
c) Virtual Local Area Network
d) Virtual LAN Aggregation Network
Rationale: VLAN stands for Virtual Local Area Network.
6. Which device operates at Layer 2 of the OSI model?
a) Router
b) Switch
c) Hub
d) Firewall
Rationale: Switches operate at Layer 2 (Data Link Layer).
7. What protocol resolves IP addresses to MAC addresses?
a) DNS
b) ICMP
c) ARP
d) FTP
Rationale: ARP resolves IPv4 addresses to MAC addresses.
8. What is the default administrative distance of OSPF?
