- A
eBGP peers are typically directly connected, but can be multi-hop with the ebgp-multihop command.
Correct because eBGP by default assumes direct connection, but multi-hop is possible.
- B
iBGP peers can be non-directly connected and often use loopback interfaces for reachability.
Correct because iBGP does not require direct connection; loopbacks provide stability.
- C
The default TTL for eBGP packets is 255.
Why wrong: Incorrect because the default TTL for eBGP is 1, not 255.
- D
In iBGP, all routers within the same AS must be fully meshed unless route reflectors or confederations are used.
Correct because iBGP requires full mesh or alternatives to prevent loops.
- E
The BGP router ID is used only for OSPF, not for BGP.
Why wrong: Incorrect because BGP uses the router ID for identification and loop prevention.
350-401 BGP Practice Question
This 350-401 practice question tests your understanding of bgp. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which three statements about BGP peering are true? (Choose three.)
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
eBGP peers are typically directly connected, but can be multi-hop with the ebgp-multihop command.
eBGP peers typically use a directly connected interface or a loopback with proper routing. iBGP peers can be non-directly connected and often use loopback interfaces for stability. The TTL for eBGP is set to 1 by default, but can be increased with the ebgp-multihop command. iBGP requires that all routers in the same AS are fully meshed or use route reflectors to avoid loops. The BGP identifier (router ID) is used to identify the BGP speaker and is used in loop prevention for iBGP.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
eBGP peers are typically directly connected, but can be multi-hop with the ebgp-multihop command.
- ✓
iBGP peers can be non-directly connected and often use loopback interfaces for reachability.
- ✗
The default TTL for eBGP packets is 255.
Why it's wrong here
Incorrect because the default TTL for eBGP is 1, not 255.
- ✓
In iBGP, all routers within the same AS must be fully meshed unless route reflectors or confederations are used.
- ✗
The BGP router ID is used only for OSPF, not for BGP.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 350-401 question test?
BGP — This question tests BGP — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: eBGP peers are typically directly connected, but can be multi-hop with the ebgp-multihop command. — eBGP peers typically use a directly connected interface or a loopback with proper routing. iBGP peers can be non-directly connected and often use loopback interfaces for stability. The TTL for eBGP is set to 1 by default, but can be increased with the ebgp-multihop command. iBGP requires that all routers in the same AS are fully meshed or use route reflectors to avoid loops. The BGP identifier (router ID) is used to identify the BGP speaker and is used in loop prevention for iBGP.
What should I do if I get this 350-401 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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