By 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
QUESTION 1
Which statement describes the default Junos OS behavior for OSPF?
A. External LSAs are advertised in a stub area.
B. An ABR does not announce a default route into a stub area.
C. Stub area internal routers generate a default route.
D. Only totally stubby areas need a default route.
Answer: B
Explanation:
QUESTION 2
What are two valid BPDU types? (Choose two.)
A. topology change notification
B. configuration change
C. configuration
D. root bridge
Answer: A,C
Explanation:
QUESTION 3
Which of the following is enabled by default on an EX Series switch?
A. MAC move limiting
B. storm control
C. IP source guard
D. dynamic ARP inspection
Answer: B
Explanation:
QUESTION 4
Which three statements correctly describe the default BGP advertisement behavior in the Junos
OS? (Choose three.)
A. Routes learned through EBGP are advertised to IBGP peers.
B. Routes learned through EBGP are advertised to other EBGP peers.
C. Routes learned through IBGP are advertised to other IBGP peers.
D. Routes learned through IBGP will be advertised to EBGP peers.
E. Routes learned through an IGP are automatically advertised to EBGP peers.
Answer: A,B,D
Explanation:
QUESTION 5
When loop protection is enabled on an interface, what happens when the port stops receiving BPDUs?
A. The port is placed in a loop-inconsistent role.
B. The port is placed into listening mode.
C. The port is transitioned into a forwarding state.
D. The interface is disabled.
Answer: A
Explanation:
QUESTION 6
Which OSPF LSA type is sent by all routers in an area to advertise its connected subnets?
A. router
B. network
C. external
D. summary
Answer: A
Explanation:
QUESTION 7
Which command correctly assigns AS 65432 as the local router’s autonomous system?
A. set protocols bgp local-as 65432
B. set routing-options local-as 65432
C. set protocols bgp autonomous-system 65432
D. set routing-options autonomous-system 65432
Answer: D
Explanation:
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