JNCIS-ENT case studies
JNCIS-ENT · Put your knowledge to work in context.
JNCIS-ENT - exam code JN0-352 - is the specialist-level certification in Juniper Networks' Enterprise Routing and Switching track. It sits between JNCIA-Junos and JNCIP-ENT and is designed for experienced networking professionals with beginner-to-intermediate knowledge of routing and switching implementations in Junos. The written exam verifies a basic understanding of routing and switching technologies along with the related platform configuration and troubleshooting skills. It is also accepted as a prerequisite for JNCIP-DC. The JNCIS-ENT case studies are 5 cases and about 3,588 words.
1Trunk to a Third-Party Switch: Sales Segment Split in Two
A Junos EX4300 stack provides access for 60 users on VLAN 120 (10.20.120.0/24). The gateway for 10.20.120.0/24 and the DHCP server for that subnet both sit in the core, reached over a multi-VLAN trunk on the stack's uplink.
686 words, about 3 min2Root Bridge Moved to the Access Layer
Three EX3400 switches are cabled in a triangle: SW-CORE connects to both SW-A and SW-B, and SW-A and SW-B are also linked to each other. All links are 1 Gbps and all VLANs use the default RSTP instance.
687 words, about 3 min3DHCP Snooping and DAI Break a Working Access Layer
An EX4300 access stack serves 200 users in VLAN 300 (10.30.0.0/23). The DHCP server is in the data center, several hops away, reachable across the trunk uplink ae0.
674 words, about 3 min4A Flapping Default Route and Equal-Cost Paths Across Mismatched Links
Four routers (R1 to R4) share one broadcast segment, 10.0.0.0/24, in OSPF area 0. R1 is the only router with a full Internet table and injects a default route with default-information originate.
754 words, about 4 min5iBGP Design: Hidden Routes and an Unintended Exit Point
AS 65001 runs three routers. BR1 peers with ISP-A (AS 65100) and BR2 peers with ISP-B (AS 65200).
787 words, about 4 min