California Computer Network Technician
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2025 Q&A | Instant Download Pdf
1. A technician is troubleshooting no connectivity. What should they
check first?
A. Reinstall OS
B. Reset router
C. Check NIC LEDs
Because physical link status (LEDs) often reveals cable or NIC faults
before software steps.
2. A technician wants secure remote desktop access to an office
computer. Which is BEST?
A. Telnet
B. VPN
C. VLAN
D. Tagged packets
VPN provides encrypted tunnel for secure remote connection.
3. To connect two PCs directly for file transfer, which cable?
A. Straight
B. Crossover
C. Loopback
, D. Rollover
A crossover cable swaps transmit/receive pairs so PCs can
communicate directly.
4. Which tool measures resistance in ohms?
A. Cable tester
B. Multimeter
C. TDR
D. Butt set
A multimeter reads electrical properties including resistance.
5. IP 220.100.100.100 with mask 255.255.255.0 in CIDR format is:
A. 220.100.100.100/24
B. /16
C. /8
D. /32
Mask 255.255.255.0 corresponds to a /24 network prefix.
6. A protocol that is connection-oriented:
A. UDP
B. SPX
C. TCP
D. None
TCP provides reliable, ordered, connection-oriented transport.
7. If ping works by IP but not by FQDN, check:
A. WINS
B. DNS
C. MAC address
D. IP address
Name resolution fails, so DNS configuration is likely at fault.
, 8. Default POP3 port is:
A. 21
B. 80
C. 110
D. 25
Standard port for POP3 email retrieval.
9. Which port is secure communication (HTTPS)?
A. 69
B. 143
C. 67
D. 443
Port 443 is used by HTTPS/TLS encrypted web services.
10. To segregate traffic within same 10.2.10.x network, best
method:
A. Dedicated broadcast network
B. Dedicated multicast network
C. Change to class C
D. Create a new subnet
Subnetting creates separate broadcast domains and isolates traffic.
11. After firmware upgrade on switches, update:
A. Wiring schematics
B. Logical topology
C. Physical diagram
D. Baseline/config documentation
Firmware changes should be reflected in baseline and configuration
documentation.
12. NIC shows no LEDs; next step:
A. Reinstall app
B. Check for hardware conflicts / disabled device
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2025 Q&A | Instant Download Pdf
1. A technician is troubleshooting no connectivity. What should they
check first?
A. Reinstall OS
B. Reset router
C. Check NIC LEDs
Because physical link status (LEDs) often reveals cable or NIC faults
before software steps.
2. A technician wants secure remote desktop access to an office
computer. Which is BEST?
A. Telnet
B. VPN
C. VLAN
D. Tagged packets
VPN provides encrypted tunnel for secure remote connection.
3. To connect two PCs directly for file transfer, which cable?
A. Straight
B. Crossover
C. Loopback
, D. Rollover
A crossover cable swaps transmit/receive pairs so PCs can
communicate directly.
4. Which tool measures resistance in ohms?
A. Cable tester
B. Multimeter
C. TDR
D. Butt set
A multimeter reads electrical properties including resistance.
5. IP 220.100.100.100 with mask 255.255.255.0 in CIDR format is:
A. 220.100.100.100/24
B. /16
C. /8
D. /32
Mask 255.255.255.0 corresponds to a /24 network prefix.
6. A protocol that is connection-oriented:
A. UDP
B. SPX
C. TCP
D. None
TCP provides reliable, ordered, connection-oriented transport.
7. If ping works by IP but not by FQDN, check:
A. WINS
B. DNS
C. MAC address
D. IP address
Name resolution fails, so DNS configuration is likely at fault.
, 8. Default POP3 port is:
A. 21
B. 80
C. 110
D. 25
Standard port for POP3 email retrieval.
9. Which port is secure communication (HTTPS)?
A. 69
B. 143
C. 67
D. 443
Port 443 is used by HTTPS/TLS encrypted web services.
10. To segregate traffic within same 10.2.10.x network, best
method:
A. Dedicated broadcast network
B. Dedicated multicast network
C. Change to class C
D. Create a new subnet
Subnetting creates separate broadcast domains and isolates traffic.
11. After firmware upgrade on switches, update:
A. Wiring schematics
B. Logical topology
C. Physical diagram
D. Baseline/config documentation
Firmware changes should be reflected in baseline and configuration
documentation.
12. NIC shows no LEDs; next step:
A. Reinstall app
B. Check for hardware conflicts / disabled device
