10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The JNCIS-ENT exam has 65 questions and runs 1 hours 30 minutes.
These 10 free JNCIS-ENT questions are organized by exam domain, so you can see how each part of the Juniper Networks Certified Specialist, Enterprise Routing and Switching (JNCIS-ENT) blueprint is tested. Reveal the answer and explanation under each question.
A Junos switch receives an Ethernet frame on an access port assigned to VLAN 30. The destination MAC address is already present in the forwarding table. What action will the switch take?
Correct answer: B - Forward the frame only out the interface associated with the destination MAC address
During a spanning-tree review, a switch port is preventing a Layer 2 loop but is not forwarding user traffic. Which RSTP state best describes this behavior?
Correct answer: C - Discarding
A campus network team wants to prevent an unauthorized access switch from becoming the spanning-tree root bridge. Which feature addresses this requirement?
Correct answer: A - Root protection
A switch port should accept DHCP responses only from trusted infrastructure while preventing rogue address offers. Which capability addresses this?
Correct answer: B - DHCP snooping
A network engineer needs traffic from a specific source subnet to use a different routing table than normal forwarding. Which Junos feature should be considered?
Correct answer: B - Filter-based forwarding
Two OSPF routers fail to form a neighbor relationship because their area settings differ. What should be verified first?
Correct answer: B - OSPF area and interface settings
On a broadcast OSPF network, which devices reduce the number of full adjacencies?
Correct answer: B - The DR and BDR
An IS-IS engineer is troubleshooting neighbor formation. Which area should be checked first?
Correct answer: A - Interface configuration and adjacency parameters
Which IS-IS element uses a type, length, and value structure?
Correct answer: C - IS-IS TLVs
A BGP engineer compares two possible routes to the same prefix. Which information is evaluated during path selection?
Correct answer: A - BGP attributes
The JNCIS-ENT exam also covers these domains. Drill them in the full free practice test:
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