Nokia NRS I Network Routing Specialist I Certification
Exam Actual 2024/2025 with Detailed Rationales |
100% Verified | Pass Guaranteed – A+ Graded
SECTION 1: NETWORKING FUNDAMENTALS & OSI MODEL (12
Questions)
Q1: Which OSI layer is responsible for establishing, managing, and terminating
sessions between applications?
A. Transport layer
B. Session layer
C. Presentation layer
D. Network layer
Correct Answer: B
Rationale: The Session layer (Layer 5) establishes, manages, and terminates
sessions between applications, handling dialog control and synchronization.
Q2: A network engineer observes that a frame has been corrupted during
transmission and is discarded by the receiving switch. At which OSI layer did this
error detection occur?
A. Physical layer
B. Data Link layer
C. Network layer
,D. Transport layer
Correct Answer: B
Rationale: The Data Link layer (Layer 2) uses Frame Check Sequence (FCS) to detect
corrupted frames and discards them before passing data to higher layers.
Q3: Which TCP/IP model layer corresponds to the OSI Presentation and Session
layers?
A. Network Access layer
B. Internet layer
C. Transport layer
D. Application layer
Correct Answer: D
Rationale: The TCP/IP Application layer encompasses the functionality of OSI Layers
5, 6, and 7 (Session, Presentation, and Application).
Q4: In Ethernet, what is the maximum transmission unit (MTU) size for a standard
frame?
A. 1,500 bytes
B. 9,198 bytes
C. 1,518 bytes
D. 64 bytes
Correct Answer: A
Rationale: The standard Ethernet MTU is 1,500 bytes of payload data; the total frame
size including headers is 1,518 bytes (or 1,522 bytes with VLAN tag).
, Q5: Which network topology provides the highest level of redundancy and fault
tolerance?
A. Bus topology
B. Star topology
C. Full mesh topology
D. Ring topology
Correct Answer: C
Rationale: A full mesh topology provides direct connections between every pair of
nodes, offering maximum redundancy and multiple paths, though at higher cost and
complexity.
Q6: A network administrator needs to segment a broadcast domain without adding a
router. Which device should be used?
A. Hub
B. Switch
C. VLAN-enabled switch
D. Repeater
Correct Answer: C
Rationale: VLANs on a managed switch create separate broadcast domains at Layer
2 without requiring a router, logically segmenting the network while maintaining
physical infrastructure.
Q7: Which field in the Ethernet frame header is used for error detection?
A. Destination MAC address
Exam Actual 2024/2025 with Detailed Rationales |
100% Verified | Pass Guaranteed – A+ Graded
SECTION 1: NETWORKING FUNDAMENTALS & OSI MODEL (12
Questions)
Q1: Which OSI layer is responsible for establishing, managing, and terminating
sessions between applications?
A. Transport layer
B. Session layer
C. Presentation layer
D. Network layer
Correct Answer: B
Rationale: The Session layer (Layer 5) establishes, manages, and terminates
sessions between applications, handling dialog control and synchronization.
Q2: A network engineer observes that a frame has been corrupted during
transmission and is discarded by the receiving switch. At which OSI layer did this
error detection occur?
A. Physical layer
B. Data Link layer
C. Network layer
,D. Transport layer
Correct Answer: B
Rationale: The Data Link layer (Layer 2) uses Frame Check Sequence (FCS) to detect
corrupted frames and discards them before passing data to higher layers.
Q3: Which TCP/IP model layer corresponds to the OSI Presentation and Session
layers?
A. Network Access layer
B. Internet layer
C. Transport layer
D. Application layer
Correct Answer: D
Rationale: The TCP/IP Application layer encompasses the functionality of OSI Layers
5, 6, and 7 (Session, Presentation, and Application).
Q4: In Ethernet, what is the maximum transmission unit (MTU) size for a standard
frame?
A. 1,500 bytes
B. 9,198 bytes
C. 1,518 bytes
D. 64 bytes
Correct Answer: A
Rationale: The standard Ethernet MTU is 1,500 bytes of payload data; the total frame
size including headers is 1,518 bytes (or 1,522 bytes with VLAN tag).
, Q5: Which network topology provides the highest level of redundancy and fault
tolerance?
A. Bus topology
B. Star topology
C. Full mesh topology
D. Ring topology
Correct Answer: C
Rationale: A full mesh topology provides direct connections between every pair of
nodes, offering maximum redundancy and multiple paths, though at higher cost and
complexity.
Q6: A network administrator needs to segment a broadcast domain without adding a
router. Which device should be used?
A. Hub
B. Switch
C. VLAN-enabled switch
D. Repeater
Correct Answer: C
Rationale: VLANs on a managed switch create separate broadcast domains at Layer
2 without requiring a router, logically segmenting the network while maintaining
physical infrastructure.
Q7: Which field in the Ethernet frame header is used for error detection?
A. Destination MAC address
