Verified 2026/2027 Computer Networks Exam With Questions And Correct Answers

1. A network technician receives a call from a use who is experiencing
network connectivity issues. The network technician questions the user
and learns the user brought in a personal wired router to use multiple
computers and connect to the network. Which of the following has the
user MOST likely introduced to the network?
A. Rogue DHCP server
B. Evil twin
C. VLAN mismatch
D. Honeypot
2. A technician is setting up a direct connection between two older PCs
so they can communicate but not be on the corporate network. The
technician does not have access to a spare switch but does have spare
Cat 6 cables, RJ-45 plugs, and a crimping tool. The technician cuts off
one end of the cable. Which of the following should the technician do to
make a crossover cable before crimping the new plug?
A. Reverse the wires leading to pins 1 and 2
B. Reverse the wires leading to pins 1 and 3
C. Reverse the wires leading to pins 2 and 3
D. Reverse the wires leading to pins 2 and 4
3. An office network consists of one two-port router connected to a 12-
port switch. A four-port hub is also connected to the switch. On this
particular network, which of the following is the number of collision
domain that exist?
A. 3
B. 12
C. 13
D. 14
E. 15
4. A network technician wants to remotely and securely access the
desktop of a Linux workstation. The desktop is running remote control

,software without encryption. Which of the following should the
technician use to secure the connection?
A. SSH in tunnel mode
B. RDP set to console connection
C. EAP-PEAP
D. SFTP
5. Which of the following should current network performance be
compared against to determine network anomalies?
A. Baseline
B. Traffic analysis
C. Packet capture
D. Logs
6. A network administrator configures an email server to use secure
protocols. When the upgrade is completed, which of the following ports
on the firewall should be configured to allow for connectivity? (Choose
three.)
A. TCP 25
B. TCP 110
C. TCP 143
D. TCP 389
E. TCP 587
F. TCP 993
G. TCP 995
7. After a server outage, a technician discovers that a physically
damaged fiber cable appears to be the problem. After replacing the
cable, the server will still not connect to the network. Upon inspecting
the cable at the server end, the technician discovers light can be seen
through one of the two fiber strands. Which of the following should the
technician do FIRST to reconnect the server to the network?
A. Reverse the fiber strands of the cable and reconnect them to the
server

,B. Use a TDR to test both strands of a new replacement cable prior to
connecting it to the server
C. Replace the server’s single-mode fiber cable with multimode fiber
D. Move the fiber cable to different port on the switch where both strands
function
8. The backups server connects to a NAS device using block-level
storage over Ethernet. The performance is very slow, however, and the
network technician suspects the performance issues are network
related. Which of the following should the technician do to improve
performance?
A. Utilize UDP to eliminate packet overhead
B. Turn off MDIX settings on the NAS and server switchports
C. Enable jumbo frames on the NAS and server
D. Encapsulate the storage traffic in a GRE tunnel
9. A technician is trying to determine the IP address of a customer’s
router. The customer has an IP address of 192.168.1.55/24. Which of the
following is the address of the customer’s router?
A. 192.168.0.55
B. 192.168.1.0
C. 192.168.1.1
D. 192.168.5.5
E. 255.255.255.0
10. A network technician is able to connect the switches between to
offices, but the offices cannot communicate with each other, as each
office uses a different IP addressing scheme. Which of the following
devices needs to be installed between the switches to allow
communication?
A. Bridge
B. Access point
C. Router
D. Range extender

, 11. A network technician is working on a proposal for email migration
from an on-premises email system to a vendor-hosted email in the
cloud. The technician needs to explain to management what type of
cloud model will be utilized with the cloud-hosted email. Which of the
following cloud models should the technician identify in the proposal?
A. IaaS
B. PaaS
C. SaaS
D. MaaS
12. Which of the following is the correct port number for NTP?
A. 25
B. 69
C. 123
D. 161
13. A technician is upgrading the firmware on an older KVM switch. The
specifications call for a serial port to connect to the computer on one
side, and an Ethernet jack to connect to the switch on the other side.
Which of the following connectors does the technician need for this
cable? (Choose two.)
A. RG-9
B. DB-9
C. RJ-11
D. DB-25
E. RJ-45
F. BNC
14. An end-user device requires a specific IP address every time it
connects to the corporate network; however, corporate policy does not
allow the use of static IP addresses. Which of the following will allow the
request to be fulfilled without breaking the corporate policy?
A. DHCP relay
B. DHCP exclusion