20+ practice questions focused on BGP — one of the most tested topics on the Juniper Networks Enterprise Routing and Switching, Specialist (JNCIS-ENT, JN0-352) (JNCIS-ENT) exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start BGP PracticeYou need to ensure that an iBGP-learned route is properly advertised to other eBGP peers without triggering routing loops. Which mechanism does BGP use automatically to prevent routing loops within an Autonomous System?
Explanation: When a BGP router advertises a route to an eBGP peer, it prepends its own AS number to the AS_PATH attribute. If a router receives a route whose AS_PATH already contains its own AS number, it rejects the route, preventing loops between autonomous systems. Within an iBGP context, this mechanism is not used for loop prevention; instead, iBGP relies on the BGP split horizon rule (routes learned via iBGP are not re-advertised to other iBGP peers) and, in route reflectors, the CLUSTER_LIST attribute. However, the question specifically asks about advertising an iBGP-learned route to eBGP peers without triggering routing loops. When that route is exported to an eBGP peer, the local AS number is prepended to the AS_PATH. If the route somehow loops back to the same AS, the AS_PATH will contain that AS number, and the router will detect the loop and discard the route. Thus, the automatic mechanism that prevents loops in this scenario is AS-path loop prevention on eBGP export.
An MX Series router is configured with BGP Multipath. Two paths have identical Local Preference, AS path length, origin, and MED. Which additional configuration statement is required under protocols bgp to enable multipath load balancing across these iBGP paths?
Explanation: By default, multipath is only for eBGP. To enable iBGP multipath, the 'as-path-multipath relaxation' or 'ibgp multipath' statement must be used.
A network engineer configures BGP confederations to scale an enterprise network. Which BGP path attribute is stripped or modified when an update leaves a sub-AS within the confederation and enters another sub-AS?
Explanation: When a BGP update traverses between sub-ASes within a confederation, the CONFED_SEQUENCE attribute is stripped or modified — specifically, the local sub-AS number is added to CONFED_SEQUENCE when the route leaves a sub-AS, and the entire CONFED_SEQUENCE is removed when the route exits the confederation to an external peer. This attribute is used only inside the confederation to prevent loops between sub-ASes.
A Junos router receives four identical routes via BGP. Reviewing the routing table, path selection picked route 3. Route 1 has a lower MED, Route 2 has a higher Local Preference, Route 4 is from an eBGP peer while Route 3 is iBGP. Assuming standard default path selection, why was Route 3 chosen over Route 4?
Explanation: In Junos BGP path selection, after comparing local preference, AS path length, origin type, and MED, Junos prefers internal (iBGP) paths over external (eBGP) paths, provided all other tie-breakers are equal.
An administrator is configuring eBGP between two Junos devices and notices the session is stuck in the Active state. The direct connection is up, and ping succeeds. Which Junos configuration parameter is most likely missing to resolve this issue?
Explanation: A BGP session stuck in Active state with a reachable directly connected peer typically indicates a TCP/179 reachability or configuration mismatch. If the peer's IP is not on a directly connected subnet (or the session must traverse multiple hops), 'multihop' must be configured so BGP can establish the TCP session beyond the directly connected link. Without it, Junos defaults to TTL 1 for eBGP, and the SYN never reaches the peer.
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Practice all BGP questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of BGP. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
BGP questions on the JNCIS-ENT frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. BGP is tested as part of the Juniper Networks Enterprise Routing and Switching, Specialist (JNCIS-ENT, JN0-352) (JNCIS-ENT) blueprint. Practicing with targeted BGP questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free JNCIS-ENT practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but BGP is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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