350-501 Security and Services Practice Question
Which TWO protocols are supported by a BNG (Broadband Network Gateway) for subscriber session establishment? (Choose two)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PPPoE
BNG supports PPPoE and IPoE (DHCP) for subscriber access. PPPoA is asynchronous transfer mode, not typically used in modern BNG.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PPPoE
Why this is correct
PPPoE is a common protocol for DSL broadband.
- ✓
IPoE (DHCP)
Why this is correct
IPoE uses DHCP for IP address assignment and authentication.
- ✗
IPSec
Why it's wrong here
IPSec is for VPN encryption, not subscriber access.
- ✗
L2TP
Why it's wrong here
L2TP is a tunneling protocol, not a subscriber session protocol.
- ✗
PPPoA
Why it's wrong here
PPPoA is used in ATM networks, not typical BNG.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.