CISCO CERTIFIED NETWORK ASSOCIATE (CCNA)
CERTIFICATION: COMPLETE PRACTICE EXAM
WITH ANSWERS AND RATIONALES
(QUESTIONS 1-100)
1. What is the purpose of the OSI model?
A) Define cabling standards
B) Provide a framework for understanding network communication
C) Assign IP addresses
D) Manage network security
Answer: B
Rationale: The OSI model is a conceptual framework that standardizes the functions of a
telecommunication or computing system into seven distinct layers to facilitate network communication .
2. Which OSI layer is responsible for routing and forwarding data?
A) Physical
B) Data Link
C) Network
D) Transport
Answer: C
Rationale: The Network Layer is responsible for logical addressing (like IP addresses) and routing packets
across different networks .
3. Which protocol operates at the Transport layer?
A) IP
B) ARP
C) TCP
,D) ICMP
Answer: C
Rationale: Transmission Control Protocol (TCP) operates at the Transport layer, providing reliable,
connection-oriented communication .
4. What is the maximum transmission unit (MTU) for Ethernet?
A) 512 bytes
B) 1024 bytes
C) 1500 bytes
D) 9000 bytes
Answer: C
Rationale: The standard Ethernet MTU is 1500 bytes, which is the largest size of a frame that can be sent
over an Ethernet network .
5. Which of the following is a private IP address range?
A) 8.8.8.0/24
B) 172.31.0.0/16
C) 169.254.0.0/16
D) 192.0.2.0/24
Answer: B
Rationale: 172.31.0.0/16 is a Class B private address range, along with 10.0.0.0/8 and 192.168.0.0/16 .
6. What is the purpose of Network Address Translation (NAT)?
A) Translate private IP addresses to public IP addresses
B) Assign domain names to IP addresses
C) Encrypt network traffic
D) Improve network speed
Answer: A
Rationale: NAT converts private IP addresses (non-routable on the internet) to public IP addresses,
allowing multiple devices to share a single public IP .
,7. Which protocol is used to map an IP address to a MAC address?
A) RARP
B) ARP
C) DHCP
D) DNS
Answer: B
Rationale: The Address Resolution Protocol (ARP) resolves an IP address to its corresponding MAC
address for local network communication .
8. Which command is used to view the ARP cache on a Windows machine?
A) ipconfig /all
B) nslookup
C) arp -a
D) netstat -r
Answer: C
Rationale: The arp -a command displays the current ARP cache, showing IP-to-MAC address mappings .
9. What is the purpose of the Spanning Tree Protocol (STP)?
A) Allow faster data transmission
B) Prevent loops in a network
C) Provide redundancy
D) Encrypt network traffic
Answer: B
Rationale: STP prevents Layer 2 loops by blocking redundant links and ensuring a loop-free logical
topology .
10. Which VLAN configuration type allows a switch port to carry traffic for multiple VLANs?
A) Access port
, B) Trunk port
C) Voice port
D) Dynamic port
Answer: B
Rationale: Trunk ports carry traffic for multiple VLANs using tagging protocols like 802.1Q or ISL .
11. What is the default native VLAN on most Cisco switches?
A) VLAN 1
B) VLAN 10
C) VLAN 100
D) VLAN 999
Answer: A
Rationale: VLAN 1 is the default native VLAN and management VLAN on Cisco switches .
12. Which protocol provides dynamic trunking negotiation?
A) VTP
B) DTP
C) CDP
D) LLDP
Answer: B
Rationale: Dynamic Trunking Protocol (DTP) negotiates trunking between switches, allowing dynamic
trunk port establishment .
13. What is the Cisco VTP mode that allows a switch to create and modify VLANs?
A) Server
B) Client
C) Transparent
D) Off
Answer: A
CERTIFICATION: COMPLETE PRACTICE EXAM
WITH ANSWERS AND RATIONALES
(QUESTIONS 1-100)
1. What is the purpose of the OSI model?
A) Define cabling standards
B) Provide a framework for understanding network communication
C) Assign IP addresses
D) Manage network security
Answer: B
Rationale: The OSI model is a conceptual framework that standardizes the functions of a
telecommunication or computing system into seven distinct layers to facilitate network communication .
2. Which OSI layer is responsible for routing and forwarding data?
A) Physical
B) Data Link
C) Network
D) Transport
Answer: C
Rationale: The Network Layer is responsible for logical addressing (like IP addresses) and routing packets
across different networks .
3. Which protocol operates at the Transport layer?
A) IP
B) ARP
C) TCP
,D) ICMP
Answer: C
Rationale: Transmission Control Protocol (TCP) operates at the Transport layer, providing reliable,
connection-oriented communication .
4. What is the maximum transmission unit (MTU) for Ethernet?
A) 512 bytes
B) 1024 bytes
C) 1500 bytes
D) 9000 bytes
Answer: C
Rationale: The standard Ethernet MTU is 1500 bytes, which is the largest size of a frame that can be sent
over an Ethernet network .
5. Which of the following is a private IP address range?
A) 8.8.8.0/24
B) 172.31.0.0/16
C) 169.254.0.0/16
D) 192.0.2.0/24
Answer: B
Rationale: 172.31.0.0/16 is a Class B private address range, along with 10.0.0.0/8 and 192.168.0.0/16 .
6. What is the purpose of Network Address Translation (NAT)?
A) Translate private IP addresses to public IP addresses
B) Assign domain names to IP addresses
C) Encrypt network traffic
D) Improve network speed
Answer: A
Rationale: NAT converts private IP addresses (non-routable on the internet) to public IP addresses,
allowing multiple devices to share a single public IP .
,7. Which protocol is used to map an IP address to a MAC address?
A) RARP
B) ARP
C) DHCP
D) DNS
Answer: B
Rationale: The Address Resolution Protocol (ARP) resolves an IP address to its corresponding MAC
address for local network communication .
8. Which command is used to view the ARP cache on a Windows machine?
A) ipconfig /all
B) nslookup
C) arp -a
D) netstat -r
Answer: C
Rationale: The arp -a command displays the current ARP cache, showing IP-to-MAC address mappings .
9. What is the purpose of the Spanning Tree Protocol (STP)?
A) Allow faster data transmission
B) Prevent loops in a network
C) Provide redundancy
D) Encrypt network traffic
Answer: B
Rationale: STP prevents Layer 2 loops by blocking redundant links and ensuring a loop-free logical
topology .
10. Which VLAN configuration type allows a switch port to carry traffic for multiple VLANs?
A) Access port
, B) Trunk port
C) Voice port
D) Dynamic port
Answer: B
Rationale: Trunk ports carry traffic for multiple VLANs using tagging protocols like 802.1Q or ISL .
11. What is the default native VLAN on most Cisco switches?
A) VLAN 1
B) VLAN 10
C) VLAN 100
D) VLAN 999
Answer: A
Rationale: VLAN 1 is the default native VLAN and management VLAN on Cisco switches .
12. Which protocol provides dynamic trunking negotiation?
A) VTP
B) DTP
C) CDP
D) LLDP
Answer: B
Rationale: Dynamic Trunking Protocol (DTP) negotiates trunking between switches, allowing dynamic
trunk port establishment .
13. What is the Cisco VTP mode that allows a switch to create and modify VLANs?
A) Server
B) Client
C) Transparent
D) Off
Answer: A
