Page 1 of 173
NETWORK ENGINEER CERTIFICATION
ACTUAL EXAM 2026/2027 COMPLETE
ACCURATE EXAM REAL QUESTIONS WITH
WELL ELABORATED ANSWERS AND
RATIONALES. (100% CORRECT VERIFIED
SOLUTIONS)
Question 1
Which OSI layer encapsulates segments into packets?
A) Application
B) Transport
C) Network
D) Data Link
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Answer: C
*Rationale: The Network layer (Layer 3) encapsulates
transport layer segments into packets, adding
source/destination IP addresses.*
Question 2
A switch receives a frame with a destination MAC not in its
CAM table. What does it do?
A) Drops the frame
B) Sends an ARP request
C) Floods the frame out all ports except the receiving port
D) Forwards to the default gateway
Answer: C
Rationale: Switches flood unknown unicast frames to all ports in
the same VLAN except the ingress port to learn the location.
Question 3
Which IPv6 address type is equivalent to a broadcast in IPv4?
A) Unicast
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B) Anycast
C) Multicast
D) Link-local
Answer: C
Rationale: IPv6 has no broadcast; multicast (e.g., FF02::1 for all
nodes) serves the same purpose.
Question 4
A NYC hospital requires zero packet loss during link failure.
Which protocol provides sub-50ms convergence?
A) STP
B) RSTP
C) MSTP
D) REP (Resilient Ethernet Protocol)
Answer: D
Rationale: REP (Cisco) provides <50ms failover, while RSTP is
several seconds. REP is common in critical NYC infrastructure.
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Question 5
What is the maximum segment length for 1000BASE-T?
A) 100 meters
B) 185 meters
C) 500 meters
D) 2 kilometers
Answer: A
*Rationale: 1000BASE-T over Cat5e/Cat6 is limited to 100
meters per IEEE 802.3ab.*
Question 6
Which TCP flag is used to reset a connection abruptly?
A) FIN
B) SYN
C) RST
D) PSH
NETWORK ENGINEER CERTIFICATION
ACTUAL EXAM 2026/2027 COMPLETE
ACCURATE EXAM REAL QUESTIONS WITH
WELL ELABORATED ANSWERS AND
RATIONALES. (100% CORRECT VERIFIED
SOLUTIONS)
Question 1
Which OSI layer encapsulates segments into packets?
A) Application
B) Transport
C) Network
D) Data Link
,Page 2 of 173
Answer: C
*Rationale: The Network layer (Layer 3) encapsulates
transport layer segments into packets, adding
source/destination IP addresses.*
Question 2
A switch receives a frame with a destination MAC not in its
CAM table. What does it do?
A) Drops the frame
B) Sends an ARP request
C) Floods the frame out all ports except the receiving port
D) Forwards to the default gateway
Answer: C
Rationale: Switches flood unknown unicast frames to all ports in
the same VLAN except the ingress port to learn the location.
Question 3
Which IPv6 address type is equivalent to a broadcast in IPv4?
A) Unicast
,Page 3 of 173
B) Anycast
C) Multicast
D) Link-local
Answer: C
Rationale: IPv6 has no broadcast; multicast (e.g., FF02::1 for all
nodes) serves the same purpose.
Question 4
A NYC hospital requires zero packet loss during link failure.
Which protocol provides sub-50ms convergence?
A) STP
B) RSTP
C) MSTP
D) REP (Resilient Ethernet Protocol)
Answer: D
Rationale: REP (Cisco) provides <50ms failover, while RSTP is
several seconds. REP is common in critical NYC infrastructure.
, Page 4 of 173
Question 5
What is the maximum segment length for 1000BASE-T?
A) 100 meters
B) 185 meters
C) 500 meters
D) 2 kilometers
Answer: A
*Rationale: 1000BASE-T over Cat5e/Cat6 is limited to 100
meters per IEEE 802.3ab.*
Question 6
Which TCP flag is used to reset a connection abruptly?
A) FIN
B) SYN
C) RST
D) PSH
