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This track enables you to demonstrate competence with networking
technology in general and Juniper Networks enterprise routing and switching
platforms. JNCIS-ENT, the specialist-level certification in this track, is designed
for experienced networking professionals with beginner to intermediate knowledge of
routing and switching implementations in Junos. The written exam verifies your basic
understanding of routing and switching technologies and related platform
configuration and troubleshooting skills.
This track contains four certifications:
- JNCIA-Junos: Junos, Associate. For details, see JNCIA-Junos.
- JNCIS-ENT: Enterprise Routing and Switching, Specialist. For details, see the
sections below.
- JNCIP-ENT: Enterprise Routing and Switching, Professional. For details, see JNCIP-ENT.
- JNCIE-ENT: Enterprise Routing and Switching, Expert. For details, see JNCIE-ENT.
Exam Preparation
We recommend the following resources to help you prepare for your exam. However, these resources
aren't required, and using them doesn't guarantee you'll pass the exam.
Exam Objectives
Here’s a high-level view of the skillset required to successfully complete the JNCIS-ENT
certification exam.
| Exam Objective |
Description |
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Layer 2 Switching or VLANs
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Identify the concepts, operations, or functionalities of
Layer 2 switching for the Junos OS:
- Bridging components
- Frame processing
Describe the concepts, benefits, or functionalities
of VLANs:
- Ports
- Tagging
- Native VLANs and voice VLANs
- Inter-VLAN routing
Demonstrate knowledge how to configure, monitor, or
troubleshoot Layer 2 switching or VLANs:
- Interfaces and ports
- VLANs
- Inter-VLAN routing
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Spanning Tree
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Describe the concepts, benefits, operations, or
functionalities of the Spanning Tree Protocol (STP):
- STP and Rapid Spanning Tree Protocol (RSTP)
concepts
- Port roles and states
- Bridge Protocol Data Units (BPDUs)
- Convergence and reconvergence
Demonstrate knowledge how to configure, monitor, or
troubleshoot Spanning Tree:
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Layer 2 Security
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Identify the concepts, benefits, or operations of
various Layer 2 protection or security features:
- BPDU, loop or root protection
- Port security, including MAC limiting, DHCP
snooping, Dynamic ARP inspection (DAI) or IP
source
guard
- MACsec
- Storm control
Identify the concepts, benefits, or operations of
Layer 2 firewall filters:
- Filter types
- Processing order
- Match criteria and actions
Demonstrate knowledge how to configure, monitor, or
troubleshoot Layer 2 security:
- Protection
- Port security
- Storm control
- Firewall filter configuration and
application
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Protocol Independent Routing
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Identify the concepts, operations, or functionalities of
various protocol-independent routing
components:
- Static, aggregate, and generated routes
- Martian addresses
- Routing instances, including routing
information base (RIB) groups
- Load balancing
- Filter-based forwarding
Demonstrate knowledge how to configure, monitor, or
troubleshoot various protocol-independent routing
components:
- Static, aggregate, and generated routes
- Load balancing
- Filter-based forwarding
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OSPF
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Describe the concepts, operations, or functionalities of
OSPF:
- Link-state database
- OSPF packet types
- Router ID
- Adjacencies and neighbors
- Designated router (DR) and backup designated
router (BDR)
- OSPF area and router types
- Realms
- Link-state advertisement (LSA) packet types
Demonstrate knowledge how to configure, monitor, or
troubleshoot OSPF:
- Areas, interfaces, and neighbors
- Additional basic options
- Routing policy application
- Troubleshooting tools (ping, traceroute,
traceoptions, show commands, logging)
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IS-IS
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Describe the concepts, operations, or functionalities of
IS-IS:
- Link-state database
- IS-IS Protocol Data Units (PDUs)
- Type, length, and values (TLVs)
- Adjacencies and neighbors
- Levels and areas
- Designated intermediate system (DIS)
- Metrics
Demonstrate knowledge of how to configure, monitor,
or troubleshoot IS-IS:
- Levels, interfaces, and adjacencies
- Additional basic options
- Routing policy application
- Troubleshooting tools (ping, traceroute,
traceoptions, show commands, logging)
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BGP
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Describe the concepts, operations, or functionalities of
BGP:
- BGP basic operation
- BGP message types
- Attributes
- Route/path selection process
- Internal and external BGP (IBGP and EBGP)
functionality and interaction
Demonstrate knowledge of how to configure, monitor,
or troubleshoot BGP:
- Groups and peers
- Additional basic options
- Routing policy application
- Troubleshooting tools (ping, traceroute,
traceoptions, show commands, logging)
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Tunnels
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Identify the concepts, requirements, or functionalities
of IP tunneling:
- Tunneling applications and considerations
- Generic Routing Encapsulation (GRE)
- IP-IP
Demonstrate knowledge of how to configure, monitor,
or troubleshoot IP tunnels:
- GRE
- IP-IP
- Troubleshooting tools (ping, traceroute,
traceoptions, show commands, logging)
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High Availability
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Identify the concepts, benefits, applications, or
requirements for high availability in a Junos OS
environment:
- Link aggregation groups (LAG)
- Redundant trunk groups (RTG)
- Virtual chassis
- Graceful restart
- Graceful Routing Engine switchover (GRES)
- Nonstop active routing (NSR)
- Nonstop bridging (NSB)
- Bidirectional Forwarding Detection (BFD)
- Virtual Router Redundancy Protocol (VRRP)
- Unified In-Service Software Upgrade (ISSU)
Demonstrate knowledge of how to configure, monitor,
or troubleshoot high availability components:
- LAG and RTG
- Virtual chassis
- Graceful restart, GRES, NSB, and NSR
- VRRP
- ISSU
- Troubleshooting tools (traceoptions, show
commands, logging)
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Exam Details
Exam questions are derived from the recommended training and the exam resources listed above.
Pass/fail status is available immediately after taking the exam. The exam is only provided in
English.
Prerequisite Certification
Exam Type
- 65 multiple-choice questions
Recertification
Juniper certifications are valid for three years. For more information, see Recertification.
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