Cisco Certified Network Associate Exam questions
and correct answers (verified answers) q &a
2027|instant download pdf
1. Which device primarily forwards Ethernet frames based on
MAC addresses?
A. Router
B. Switch
C. Firewall
D. Modem
Answer: B. Switch
Rationale: A switch uses its MAC address table to determine
where Ethernet frames should be forwarded.
2. Which OSI layer is responsible for logical addressing using IP
addresses?
A. Physical
B. Data Link
C. Network
D. Transport
Answer: C. Network
Rationale: Layer 3, the Network layer, provides logical
addressing and routing through protocols such as IPv4 and IPv6.
,3. Which protocol is commonly used to automatically assign IP
addresses to hosts?
A. DNS
B. DHCP
C. FTP
D. SSH
Answer: B. DHCP
Rationale: Dynamic Host Configuration Protocol automatically
provides clients with IP configuration information.
4. What is the primary function of DNS?
A. Encrypt network traffic
B. Translate domain names into IP addresses
C. Assign MAC addresses
D. Forward Ethernet frames
Answer: B. Translate domain names into IP addresses
Rationale: DNS resolves human-readable names such as
example.com into IP addresses.
5. Which IPv4 address is a private address?
A. 8.8.8.8
B. 172.16.10.5
,C. 1.1.1.1
D. 209.165.200.1
Answer: B. 172.16.10.5
Rationale: The private IPv4 ranges include 10.0.0.0/8,
172.16.0.0/12, and 192.168.0.0/16.
6. What is the default subnet mask for a Class C IPv4 network
in traditional classful addressing?
A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255
Answer: C. 255.255.255.0
Rationale: A traditional Class C network uses a /24 mask,
equivalent to 255.255.255.0.
7. Which protocol is used to securely access a Cisco device
through a command-line interface?
A. Telnet
B. FTP
C. SSH
D. TFTP
, Answer: C. SSH
Rationale: SSH provides encrypted remote command-line
access.
8. Which protocol sends remote terminal information without
encryption?
A. SSH
B. Telnet
C. HTTPS
D. SFTP
Answer: B. Telnet
Rationale: Telnet transmits communications in plaintext,
making SSH the preferred secure alternative.
9. Which command displays the IP address and status of
interfaces on many Cisco IOS devices?
A. show vlan
B. show ip interface brief
C. show mac address-table
D. show version
Answer: B. show ip interface brief
Rationale: This command provides a concise summary of
interface IP addresses and operational status.
and correct answers (verified answers) q &a
2027|instant download pdf
1. Which device primarily forwards Ethernet frames based on
MAC addresses?
A. Router
B. Switch
C. Firewall
D. Modem
Answer: B. Switch
Rationale: A switch uses its MAC address table to determine
where Ethernet frames should be forwarded.
2. Which OSI layer is responsible for logical addressing using IP
addresses?
A. Physical
B. Data Link
C. Network
D. Transport
Answer: C. Network
Rationale: Layer 3, the Network layer, provides logical
addressing and routing through protocols such as IPv4 and IPv6.
,3. Which protocol is commonly used to automatically assign IP
addresses to hosts?
A. DNS
B. DHCP
C. FTP
D. SSH
Answer: B. DHCP
Rationale: Dynamic Host Configuration Protocol automatically
provides clients with IP configuration information.
4. What is the primary function of DNS?
A. Encrypt network traffic
B. Translate domain names into IP addresses
C. Assign MAC addresses
D. Forward Ethernet frames
Answer: B. Translate domain names into IP addresses
Rationale: DNS resolves human-readable names such as
example.com into IP addresses.
5. Which IPv4 address is a private address?
A. 8.8.8.8
B. 172.16.10.5
,C. 1.1.1.1
D. 209.165.200.1
Answer: B. 172.16.10.5
Rationale: The private IPv4 ranges include 10.0.0.0/8,
172.16.0.0/12, and 192.168.0.0/16.
6. What is the default subnet mask for a Class C IPv4 network
in traditional classful addressing?
A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255
Answer: C. 255.255.255.0
Rationale: A traditional Class C network uses a /24 mask,
equivalent to 255.255.255.0.
7. Which protocol is used to securely access a Cisco device
through a command-line interface?
A. Telnet
B. FTP
C. SSH
D. TFTP
, Answer: C. SSH
Rationale: SSH provides encrypted remote command-line
access.
8. Which protocol sends remote terminal information without
encryption?
A. SSH
B. Telnet
C. HTTPS
D. SFTP
Answer: B. Telnet
Rationale: Telnet transmits communications in plaintext,
making SSH the preferred secure alternative.
9. Which command displays the IP address and status of
interfaces on many Cisco IOS devices?
A. show vlan
B. show ip interface brief
C. show mac address-table
D. show version
Answer: B. show ip interface brief
Rationale: This command provides a concise summary of
interface IP addresses and operational status.
