Cisco Enterprise Networking Mastery:
Advanced Certification Practice Exam a
well detailed practice exam 2025/2026
graded A+ well written !!! 150 Multiple-
Choice Questions | Advanced / Mixed
Difficulty | For CCNP/CCIE Candidates
SECTION 1: NETWORK FUNDAMENTALS & OSI MODEL (Questions 1–10)
Question 1
A network engineer is troubleshooting an application where clients intermittently fail to
establish sessions with a server. Analysis reveals that segments are being delivered out of order
and some are being retransmitted unnecessarily. At which OSI layer should the engineer focus
their investigation?
A) Layer 3 – Network
B) Layer 4 – Transport
C) Layer 5 – Session
D) Layer 7 – Application
Correct Answer: B
Rationale: The Transport layer (Layer 4) is responsible for end-to-end reliability, flow control,
segmentation, sequencing, and error recovery. TCP operates at this layer and manages segment
,sequencing and retransmission. While Layer 3 handles logical addressing and routing, it does
not provide the reliability or sequencing functions described.
Question 2
In the TCP/IP model, the functionality of the OSI Presentation and Session layers is most closely
associated with which TCP/IP layer?
A) Network Access
B) Internet
C) Transport
D) Application
Correct Answer: D
Rationale: The TCP/IP Application layer encompasses the functions of the OSI Application,
Presentation, and Session layers. It handles application-level protocols, data representation,
encryption, and session management. The Network Access layer combines OSI Physical and
Data Link functions, the Internet layer corresponds to OSI Network, and the Transport layer
maps directly to OSI Transport.
Question 3
Which Protocol Data Unit (PDU) is correctly associated with its OSI layer in Cisco IOS
troubleshooting?
A) Frame – Layer 3
B) Segment – Layer 4
C) Packet – Layer 2
D) Bit – Layer 5
Correct Answer: B
Rationale: The Transport layer (Layer 4) PDU is called a segment (TCP) or datagram (UDP). Data
Link layer uses frames, Network layer uses packets, and the Physical layer uses bits.
Understanding PDU naming conventions is fundamental to Cisco certification exams and
troubleshooting methodologies.
,Question 4
A Cisco switch receives a frame with a destination MAC address that is not present in its CAM
table. What is the switch's forwarding action?
A) Drops the frame immediately
B) Forwards the frame to all ports except the receiving port
C) Forwards the frame only to the default gateway
D) Sends an ARP request for the destination MAC
Correct Answer: B
Rationale: When a switch receives a frame with an unknown destination MAC address, it floods
the frame out all ports except the port on which it was received. This is known as unknown
unicast flooding. The switch learns the MAC address when the destination device responds,
populating the CAM table for future forwarding decisions.
Question 5
Which statement correctly describes the operation of Link-Local IPv6 addresses?
A) They are globally routable and unique across the entire Internet
B) They are automatically configured on every IPv6-enabled interface
C) They require manual configuration by a network administrator
D) They are used exclusively for multicast communication
Correct Answer: B
Rationale: IPv6 Link-Local addresses are automatically configured on every IPv6-enabled
interface and are used for communication within the same local link. They are not routable
beyond the local network segment and begin with the FE80::/10 prefix. These addresses are
essential for neighbor discovery and other link-local operations.
Question 6
An enterprise network is experiencing slow performance. The senior engineer suspects
excessive broadcast traffic is consuming bandwidth. Which device type would be most effective
at segmenting broadcast domains?
A) Hub
B) Switch
C) Router
D) Repeater
, Correct Answer: C
Rationale: Routers operate at Layer 3 and do not forward broadcasts by default, effectively
segmenting broadcast domains. Switches (Layer 2) forward broadcasts within a VLAN, so they
do not segment broadcast domains unless VLANs are configured. Hubs and repeaters operate at
Layer 1 and forward all traffic, including broadcasts, without segmentation.
Question 7
A network administrator is analyzing a packet capture and notices that the TTL field in an IPv4
header has reached zero. Which device is most likely responsible for dropping this packet and
sending an ICMP Time Exceeded message?
A) Source host
B) Destination host
C) Intermediate router
D) Layer 2 switch
Correct Answer: C
Rationale: When a router decrements the TTL field to zero, it drops the packet and sends an
ICMP Time Exceeded message back to the source. This mechanism prevents packets from
looping indefinitely in the network. Switches operate at Layer 2 and do not process TTL values.
Question 8
Which of the following is NOT a function of the OSI Data Link layer?
A) Frame delimiting
B) MAC addressing
C) Logical addressing
D) Error detection (CRC)
Correct Answer: C
Rationale: Logical addressing (IP addresses) is a function of the Network layer (Layer 3), not the
Data Link layer. The Data Link layer (Layer 2) is responsible for frame delimiting, MAC
addressing, error detection through CRC, and media access control.
Advanced Certification Practice Exam a
well detailed practice exam 2025/2026
graded A+ well written !!! 150 Multiple-
Choice Questions | Advanced / Mixed
Difficulty | For CCNP/CCIE Candidates
SECTION 1: NETWORK FUNDAMENTALS & OSI MODEL (Questions 1–10)
Question 1
A network engineer is troubleshooting an application where clients intermittently fail to
establish sessions with a server. Analysis reveals that segments are being delivered out of order
and some are being retransmitted unnecessarily. At which OSI layer should the engineer focus
their investigation?
A) Layer 3 – Network
B) Layer 4 – Transport
C) Layer 5 – Session
D) Layer 7 – Application
Correct Answer: B
Rationale: The Transport layer (Layer 4) is responsible for end-to-end reliability, flow control,
segmentation, sequencing, and error recovery. TCP operates at this layer and manages segment
,sequencing and retransmission. While Layer 3 handles logical addressing and routing, it does
not provide the reliability or sequencing functions described.
Question 2
In the TCP/IP model, the functionality of the OSI Presentation and Session layers is most closely
associated with which TCP/IP layer?
A) Network Access
B) Internet
C) Transport
D) Application
Correct Answer: D
Rationale: The TCP/IP Application layer encompasses the functions of the OSI Application,
Presentation, and Session layers. It handles application-level protocols, data representation,
encryption, and session management. The Network Access layer combines OSI Physical and
Data Link functions, the Internet layer corresponds to OSI Network, and the Transport layer
maps directly to OSI Transport.
Question 3
Which Protocol Data Unit (PDU) is correctly associated with its OSI layer in Cisco IOS
troubleshooting?
A) Frame – Layer 3
B) Segment – Layer 4
C) Packet – Layer 2
D) Bit – Layer 5
Correct Answer: B
Rationale: The Transport layer (Layer 4) PDU is called a segment (TCP) or datagram (UDP). Data
Link layer uses frames, Network layer uses packets, and the Physical layer uses bits.
Understanding PDU naming conventions is fundamental to Cisco certification exams and
troubleshooting methodologies.
,Question 4
A Cisco switch receives a frame with a destination MAC address that is not present in its CAM
table. What is the switch's forwarding action?
A) Drops the frame immediately
B) Forwards the frame to all ports except the receiving port
C) Forwards the frame only to the default gateway
D) Sends an ARP request for the destination MAC
Correct Answer: B
Rationale: When a switch receives a frame with an unknown destination MAC address, it floods
the frame out all ports except the port on which it was received. This is known as unknown
unicast flooding. The switch learns the MAC address when the destination device responds,
populating the CAM table for future forwarding decisions.
Question 5
Which statement correctly describes the operation of Link-Local IPv6 addresses?
A) They are globally routable and unique across the entire Internet
B) They are automatically configured on every IPv6-enabled interface
C) They require manual configuration by a network administrator
D) They are used exclusively for multicast communication
Correct Answer: B
Rationale: IPv6 Link-Local addresses are automatically configured on every IPv6-enabled
interface and are used for communication within the same local link. They are not routable
beyond the local network segment and begin with the FE80::/10 prefix. These addresses are
essential for neighbor discovery and other link-local operations.
Question 6
An enterprise network is experiencing slow performance. The senior engineer suspects
excessive broadcast traffic is consuming bandwidth. Which device type would be most effective
at segmenting broadcast domains?
A) Hub
B) Switch
C) Router
D) Repeater
, Correct Answer: C
Rationale: Routers operate at Layer 3 and do not forward broadcasts by default, effectively
segmenting broadcast domains. Switches (Layer 2) forward broadcasts within a VLAN, so they
do not segment broadcast domains unless VLANs are configured. Hubs and repeaters operate at
Layer 1 and forward all traffic, including broadcasts, without segmentation.
Question 7
A network administrator is analyzing a packet capture and notices that the TTL field in an IPv4
header has reached zero. Which device is most likely responsible for dropping this packet and
sending an ICMP Time Exceeded message?
A) Source host
B) Destination host
C) Intermediate router
D) Layer 2 switch
Correct Answer: C
Rationale: When a router decrements the TTL field to zero, it drops the packet and sends an
ICMP Time Exceeded message back to the source. This mechanism prevents packets from
looping indefinitely in the network. Switches operate at Layer 2 and do not process TTL values.
Question 8
Which of the following is NOT a function of the OSI Data Link layer?
A) Frame delimiting
B) MAC addressing
C) Logical addressing
D) Error detection (CRC)
Correct Answer: C
Rationale: Logical addressing (IP addresses) is a function of the Network layer (Layer 3), not the
Data Link layer. The Data Link layer (Layer 2) is responsible for frame delimiting, MAC
addressing, error detection through CRC, and media access control.
