CISCO CCNA (NETWORKING) COMPLETE EXAM QUESTIONS
AND 100% VERIFIED ANSWERS WITH WELL DETAILED
SOLUTIONS.
1. Which OSI layer is responsible for end-to-end communication and flow control?
A. Network
B. Data Link
C. Transport
D. Session
Correct Answer: C
Rationale: The Transport layer ensures reliable delivery, flow control, and error
recovery. Other layers handle addressing (Network), framing (Data Link), and
session management (Session).
2. What is the primary function of a default gateway in a network?
A. Assign IP addresses
B. Forward traffic to external networks
C. Encrypt data packets
D. Filter MAC addresses
Correct Answer: B
Rationale: A default gateway routes traffic from a local network to external networks.
It does not assign IPs, encrypt data, or filter MAC addresses.
3. Which protocol is used to map IP addresses to MAC addresses?
A. DNS
B. DHCP
C. ARP
D. ICMP
Correct Answer: C
Rationale: ARP resolves IP addresses to MAC addresses. DNS resolves names,
DHCP assigns IPs, and ICMP handles diagnostics.
4. What is the subnet mask for a /26 network?
A. 255.255.255.0
B. 255.255.255.128
C. 255.255.255.192
D. 255.255.255.224
Correct Answer: C
Rationale: A /26 subnet mask equals 255.255.255.192, providing 64 addresses per
subnet.
,5. Which command displays the routing table on a Cisco router?
A. show ip interface brief
B. show running-config
C. show ip route
D. show version
Correct Answer: C
Rationale: "show ip route" displays routing table entries. Other commands show
interfaces, configs, or system info.
6. Which protocol uses port 443 by default?
A. HTTP
B. FTP
C. HTTPS
D. Telnet
Correct Answer: C
Rationale: HTTPS uses port 443 for secure web communication. HTTP uses 80, FTP
21, Telnet 23.
7. What type of address is 224.0.0.1?
A. Unicast
B. Broadcast
C. Multicast
D. Loopback
Correct Answer: C
Rationale: Addresses in 224.0.0.0–239.255.255.255 are multicast addresses.
8. Which switching method has the lowest latency?
A. Store-and-forward
B. Fragment-free
C. Cut-through
D. Adaptive switching
Correct Answer: C
Rationale: Cut-through switching forwards frames immediately without checking for
errors, reducing latency.
9. Which VLAN range is reserved for normal VLANs?
A. 0–1005
B. 1006–4094
C. 1–4094
D. 1002–1005
Correct Answer: A
, Rationale: VLAN IDs 1–1005 are considered normal range VLANs; extended range
starts from 1006.
10. What does STP prevent in a switched network?
A. Broadcast traffic
B. Routing loops
C. Switching loops
D. Packet loss
Correct Answer: C
Rationale: Spanning Tree Protocol prevents switching loops that can cause broadcast
storms.
11. Which protocol dynamically assigns IP addresses?
A. DNS
B. DHCP
C. SNMP
D. NTP
Correct Answer: B
Rationale: DHCP automatically assigns IP configurations to hosts.
12. What is the purpose of NAT?
A. Encrypt data
B. Assign MAC addresses
C. Translate private IPs to public IPs
D. Monitor network traffic
Correct Answer: C
Rationale: NAT translates private IP addresses to public ones for internet access.
13. Which command is used to configure a router interface IP?
A. ip route
B. ip address
C. interface ip
D. set ip
Correct Answer: B
Rationale: The "ip address" command assigns an IP address to an interface.
14. What is the maximum length of a UTP cable for Ethernet?
A. 50 meters
B. 100 meters
C. 200 meters
, D. 500 meters
Correct Answer: B
Rationale: Ethernet over UTP supports a maximum of 100 meters per segment.
15. Which protocol is used for secure remote access to network devices?
A. Telnet
B. FTP
C. SSH
D. HTTP
Correct Answer: C
Rationale: SSH provides encrypted remote access, unlike Telnet which is unsecure.
16. Which IPv6 address type is equivalent to IPv4 private addressing?
A. Global unicast
B. Link-local
C. Unique local
D. Multicast
Correct Answer: C
Rationale: Unique local addresses (ULA) are used similarly to private IPv4
addresses.
17. What is the administrative distance of a directly connected route?
A. 0
B. 1
C. 90
D. 110
Correct Answer: A
Rationale: Directly connected routes have an administrative distance of 0, making
them most preferred.
18. Which protocol is used to test network connectivity?
A. FTP
B. ICMP
C. SNMP
D. ARP
Correct Answer: B
Rationale: ICMP is used by tools like ping to test connectivity.
19. What is a trunk port used for?
A. Connecting end devices
AND 100% VERIFIED ANSWERS WITH WELL DETAILED
SOLUTIONS.
1. Which OSI layer is responsible for end-to-end communication and flow control?
A. Network
B. Data Link
C. Transport
D. Session
Correct Answer: C
Rationale: The Transport layer ensures reliable delivery, flow control, and error
recovery. Other layers handle addressing (Network), framing (Data Link), and
session management (Session).
2. What is the primary function of a default gateway in a network?
A. Assign IP addresses
B. Forward traffic to external networks
C. Encrypt data packets
D. Filter MAC addresses
Correct Answer: B
Rationale: A default gateway routes traffic from a local network to external networks.
It does not assign IPs, encrypt data, or filter MAC addresses.
3. Which protocol is used to map IP addresses to MAC addresses?
A. DNS
B. DHCP
C. ARP
D. ICMP
Correct Answer: C
Rationale: ARP resolves IP addresses to MAC addresses. DNS resolves names,
DHCP assigns IPs, and ICMP handles diagnostics.
4. What is the subnet mask for a /26 network?
A. 255.255.255.0
B. 255.255.255.128
C. 255.255.255.192
D. 255.255.255.224
Correct Answer: C
Rationale: A /26 subnet mask equals 255.255.255.192, providing 64 addresses per
subnet.
,5. Which command displays the routing table on a Cisco router?
A. show ip interface brief
B. show running-config
C. show ip route
D. show version
Correct Answer: C
Rationale: "show ip route" displays routing table entries. Other commands show
interfaces, configs, or system info.
6. Which protocol uses port 443 by default?
A. HTTP
B. FTP
C. HTTPS
D. Telnet
Correct Answer: C
Rationale: HTTPS uses port 443 for secure web communication. HTTP uses 80, FTP
21, Telnet 23.
7. What type of address is 224.0.0.1?
A. Unicast
B. Broadcast
C. Multicast
D. Loopback
Correct Answer: C
Rationale: Addresses in 224.0.0.0–239.255.255.255 are multicast addresses.
8. Which switching method has the lowest latency?
A. Store-and-forward
B. Fragment-free
C. Cut-through
D. Adaptive switching
Correct Answer: C
Rationale: Cut-through switching forwards frames immediately without checking for
errors, reducing latency.
9. Which VLAN range is reserved for normal VLANs?
A. 0–1005
B. 1006–4094
C. 1–4094
D. 1002–1005
Correct Answer: A
, Rationale: VLAN IDs 1–1005 are considered normal range VLANs; extended range
starts from 1006.
10. What does STP prevent in a switched network?
A. Broadcast traffic
B. Routing loops
C. Switching loops
D. Packet loss
Correct Answer: C
Rationale: Spanning Tree Protocol prevents switching loops that can cause broadcast
storms.
11. Which protocol dynamically assigns IP addresses?
A. DNS
B. DHCP
C. SNMP
D. NTP
Correct Answer: B
Rationale: DHCP automatically assigns IP configurations to hosts.
12. What is the purpose of NAT?
A. Encrypt data
B. Assign MAC addresses
C. Translate private IPs to public IPs
D. Monitor network traffic
Correct Answer: C
Rationale: NAT translates private IP addresses to public ones for internet access.
13. Which command is used to configure a router interface IP?
A. ip route
B. ip address
C. interface ip
D. set ip
Correct Answer: B
Rationale: The "ip address" command assigns an IP address to an interface.
14. What is the maximum length of a UTP cable for Ethernet?
A. 50 meters
B. 100 meters
C. 200 meters
, D. 500 meters
Correct Answer: B
Rationale: Ethernet over UTP supports a maximum of 100 meters per segment.
15. Which protocol is used for secure remote access to network devices?
A. Telnet
B. FTP
C. SSH
D. HTTP
Correct Answer: C
Rationale: SSH provides encrypted remote access, unlike Telnet which is unsecure.
16. Which IPv6 address type is equivalent to IPv4 private addressing?
A. Global unicast
B. Link-local
C. Unique local
D. Multicast
Correct Answer: C
Rationale: Unique local addresses (ULA) are used similarly to private IPv4
addresses.
17. What is the administrative distance of a directly connected route?
A. 0
B. 1
C. 90
D. 110
Correct Answer: A
Rationale: Directly connected routes have an administrative distance of 0, making
them most preferred.
18. Which protocol is used to test network connectivity?
A. FTP
B. ICMP
C. SNMP
D. ARP
Correct Answer: B
Rationale: ICMP is used by tools like ping to test connectivity.
19. What is a trunk port used for?
A. Connecting end devices
