83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
Question 1. Which functional entity in the 5G NG-RAN architecture is
responsible for handling the user plane and control plane separation?
A) gNB-DU
B) gNB-CU
C) ng-eNB
D) eNB
Answer: B
Explanation: The gNB-CU (Centralized Unit) manages both user plane
and control plane functions, enabling flexibility and scalability in NG-
RAN.
Question 2. Which functional split option is typically used for separating
the Centralized Unit (CU) and Distributed Unit (DU) in 5G RAN?
,83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
A) Option 8
B) Option 2
C) Option 7.2
D) Option 3
Answer: B
Explanation: Option 2 split is the CU-DU split, placing the PDCP layer in
the CU and RLC/MAC/PHY in the DU.
Question 3. What is a primary benefit of using functional split Option
7.2 in 5G RAN fronthaul?
A) Reduced need for synchronization
B) Lower fronthaul bandwidth requirement compared to Option 8
C) Simplified network configuration
,83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
D) Complete centralization of radio controllers
Answer: B
Explanation: Option 7.2 moves some PHY processing to the DU,
reducing fronthaul bandwidth needs compared to Option 8 (full
fronthaul).
Question 4. Which protocol is primarily used to transport user and
control plane data between DU and RU in a 5G network?
A) S1AP
B) eCPRI
C) GTP-U
D) SCTP
Answer: B
, 83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
Explanation: eCPRI is the main protocol for transporting user and
control plane data over fronthaul between DU and RU.
Question 5. What is the main role of RoE (Radio over Ethernet) in 5G
transport networks?
A) Encrypting radio signals
B) Encapsulating radio I/Q data over Ethernet
C) Converting Ethernet to optical signals
D) Managing handovers
Answer: B
Explanation: RoE encapsulates radio I/Q data for transmission over
Ethernet in fronthaul networks.
expert level theoretical Exam
Question 1. Which functional entity in the 5G NG-RAN architecture is
responsible for handling the user plane and control plane separation?
A) gNB-DU
B) gNB-CU
C) ng-eNB
D) eNB
Answer: B
Explanation: The gNB-CU (Centralized Unit) manages both user plane
and control plane functions, enabling flexibility and scalability in NG-
RAN.
Question 2. Which functional split option is typically used for separating
the Centralized Unit (CU) and Distributed Unit (DU) in 5G RAN?
,83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
A) Option 8
B) Option 2
C) Option 7.2
D) Option 3
Answer: B
Explanation: Option 2 split is the CU-DU split, placing the PDCP layer in
the CU and RLC/MAC/PHY in the DU.
Question 3. What is a primary benefit of using functional split Option
7.2 in 5G RAN fronthaul?
A) Reduced need for synchronization
B) Lower fronthaul bandwidth requirement compared to Option 8
C) Simplified network configuration
,83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
D) Complete centralization of radio controllers
Answer: B
Explanation: Option 7.2 moves some PHY processing to the DU,
reducing fronthaul bandwidth needs compared to Option 8 (full
fronthaul).
Question 4. Which protocol is primarily used to transport user and
control plane data between DU and RU in a 5G network?
A) S1AP
B) eCPRI
C) GTP-U
D) SCTP
Answer: B
, 83 202 ZCIE of 5G IPRAN 5G IPRAN
expert level theoretical Exam
Explanation: eCPRI is the main protocol for transporting user and
control plane data over fronthaul between DU and RU.
Question 5. What is the main role of RoE (Radio over Ethernet) in 5G
transport networks?
A) Encrypting radio signals
B) Encapsulating radio I/Q data over Ethernet
C) Converting Ethernet to optical signals
D) Managing handovers
Answer: B
Explanation: RoE encapsulates radio I/Q data for transmission over
Ethernet in fronthaul networks.
