JNCIS-ENT Exam Objectives (Exam: JN0-343 and JN0-346)

Layer 2 Switching and VLANs
Identify the concepts, operation, and functionality of Layer 2 switching for the Junos OS
Enterprise switching platforms
Bridging components
Frame processing
Identify the concepts, benefits, and functionality of VLANs
Ports
Tagging
Native VLANs and voice VLANs
Inter-VLAN routing
Demonstrate knowledge of how to configure, monitor and troubleshoot Layer 2 switching and VLANs
Interfaces and ports
VLANs
Routed VLAN interfaces (RVI)

Spanning Tree
Identify the concepts, benefits, operation, and functionality of the Spanning Tree Protocol
STP and RSTP concepts
Port roles and states
BPDUs
Convergence and reconvergence
Demonstrate knowledge of how to configure and monitor STP and RSTP
STP
RSTP

Layer 2 Security
Identify the concepts, benefits and operation of various protection and security features
BPDU, loop and root protection
Port security, including MAC limiting, DHCP snooping, Dynamic ARP inspection (DAI) and IP source guard
Storm control
Identify the concepts, benefits and operation of Layer 2 firewall filtres
Filter types
Processing order
Match criteria and actions
Demonstrate knowledge of how to configure and monitor Layer 2 security
Protection
Port security
Storm control
Firewall filter configuration and application

Protocol Independent Routing
Identify the concepts, operation and functionality of various protocol-independent routing components
Static, aggregate, and generated routes
Martian addresses
Routing instances, including RIB groups
Load balancing
Filter-based forwarding
Demonstrate knowledge of how to configure and monitor various protocol-independent routing components
Static, aggregate, and generated routes
Load balancing
Filter-based forwarding

Open Shortest Path First (OSPF)
Identify the concepts, operation and functionality 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
LSA packet types
Demonstrate knowledge of how to configure, monitor and troubleshoot OSPF
Areas, interfaces and neighbors
Additional basic options
Routing policy application
Troubleshooting tools
Realms

Intermediate System to Intermediate System (IS-IS)
Identify the concepts, operation and functionality of IS-IS
Link-state database
IS-IS PDUs
TLVs
Adjacencies and neighbors
Levels and areas
Designated intermediate system (DIS)
Metrics
Demonstrate knowledge of how to configure, monitor and troubleshoot IS-IS
Levels, interfaces and adjacencies
Additional basic options
Routing policy application
Troubleshooting tools

Border Gateway Protocol (BGP)
Identify the concepts, operation and functionality of BGP
BGP basic operation
BGP message types
Attributes
Route/path selection process
IBGP and EBGP functionality and interaction
Demonstrate knowledge of how to configure and monitor BGP
Groups and peers
Additional basic options
Routing policy application

Tunnels
Identify the concepts, requirements and functionality of IP tunneling
Tunneling applications and considerations
GRE
IP-IP
Demonstrate knowledge of how to configure and monitor IP tunnels
GRE
IP-IP

High Availability
Identify the concepts, benefits, applications and requirements for high availability in a Junos OS environment
Link aggregation groups (LAG)
Redundant trunk groups (RTG)
Virtual Chassis
Graceful restart (GR)
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 and monitor high availability components
LAG and RTG
Virtual Chassis
GR, GRES, NSR, and NSB
VRRP
ISSU

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QUESTION: No: 1
Which two statements about RSTP are correct? (Choose two.)

A. RSTP is not backwards compatible with STP.
B. RSTP is backwards compatible with STP.
C. RSTP permits multiple root bridges within a Layer 2 domain.
D. RSTP permits only a single root bridge within a Layer 2 domain.

Answer: Click Here to view answers

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QUESTION: No: 2
Which two port security features are dependent on the DHCP snooping database? (Choose two.)

A. MAC limiting
B. dynamic ARP inspection
C. IP source guard
D. storm control

Answer: Click Here to view answers

Explanation: B: Dynamic ARP inspection (DAI) prevents Address Resolution Protocol (ARP) spoofing

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QUESTION: No: 3
How many bytes of overhead does an IP-IP tunnel add to a packet?

A. 24 bytes
B. 28 bytes
C. 20 bytes
D. 14 bytes

Answer: Click Here to view answers

Explanation: Difference Between GRE and IP-IP Tunnel. Generic Routing Encapsulation (GRE) and

Click here to view complete Q&A of JN0-346 exam
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