JNCIP-ENT Exam Objectives (Exam: JN0-643 and JN0-646)

OSPF
Describe the concepts, operation and functionality of OSPFv2 and OSPFv3
OSPF LSA types
OSPF area types and operations
LSA flooding through an OSPF multi-area network
DR/BDR operation
SPF algorithm
Metrics, including external metric types
Authentication options
Route summarization and restriction
Overload
Virtual links
OSPFv2 vs OSPFv3
Given a scenario, demonstrate knowledge of how to configure and monitor single-area and multi-area OSPF
Implement OSPF routing policy

BGP
Describe the concepts, operation and functionality of BGP
BGP route selection process
Next hop resolution
BGP attributes – concept and operation
BGP communities
Regular expressions
Load balancing – multipath, multihop, forwarding table
NLRI families – inet, inet6
Advanced BGP options
Given a scenario, demonstrate knowledge of how to configure and monitor BGP
Implement BGP routing policy

IP Multicast
Describe the concepts, operation and functionality of IP multicast
Components of IP multicast, including multicast addressing
IP multicast traffic flow
Any-Source Multicast (ASM) vs. Source-Specific Multicast (SSM)
RPF – concept and operation
IGMP, IGMP snooping
PIM dense-mode and sparse-mode
Rendezvous point (RP) – concept, operation, discovery, election
SSM – requirements, benefits, address ranges
Anycast RP
MSDP
Routing policy and scoping
Given a scenario, demonstrate knowledge of how to configure and monitor IGMP, PIM-DM and PIM-SM (including SSM)
Implement IP multicast routing policy

Ethernet Switching and Spanning Tree
Describe the concepts, operation and functionality of advanced Ethernet switching
Filter-based VLANs
Private VLANs
Dynamic VLAN registration using MVRP
Tunnel Layer 2 traffic through Ethernet networks
Layer 2 tunneling using Q-in-Q and L2PT
Given a scenario, demonstrate knowledge of how to configure and monitor advanced Ethernet switching
Filter-based VLANs
Private VLANs
Dynamic VLAN registration using MVRP
Tunnel Layer 2 traffic through Ethernet networks
Layer 2 tunneling using Q-in-Q and L2PT
Describe the concepts, operation and functionality of advanced spanning tree protocols, including MSTP and VSTP
Given a scenario, demonstrate knowledge of how to configure and monitor MSTP and VSTP

Layer 2 Authentication and Access Control
Describe the operation of various Layer 2 authentication and access control features
Authentication process flow
802.1x – concepts and functionality
MAC RADIUS
Captive portal
Server fail fallback
Guest VLAN
Considerations when using multiple authentication/access control methods
Given a scenario, demonstration how to configure and monitor Layer 2 authentication and access control

IP Telephony Features
Describe the concepts, operation and functionality of features that facilitate IP telephony deployments
Power over Ethernet (PoE)
LLDP and LLDP-MED
Voice VLAN
Given a scenario, demonstrated how to configure and monitor features used to support IP Telephony

Class of Service (CoS)
Describe the concepts, operation and functionality of Junos CoS for Layer 2/3 networks
CoS processing on Junos devices
CoS header fields
Forwarding classes
Classification
Packet loss priority
Policers
Schedulers
Drop profiles
Shaping
Rewrite rules
Given a scenario, demonstrate knowledge of how to configure and monitor CoS for Layer 2/3 networks
QUESTION 1
Which connection method do OSPF routers use to communicate with each other?

A. IP protocol number 89
B. TCP port 179
C. UDP port 179
D. IP protocol number 6

Answer: A

Explanation:


QUESTION 2
Which statement is true about default BGP route redistribution behavior?

A. IBGP-learned routes are advertised only to other IBGP peers.
B. EBGP-learned routes are redistributed into any IGPs.
C. EBGP-learned routes are advertised only to other EBGP peers.
D. EBGP-learned routes are advertised to other IBGP and EBGP peers.

Answer: D

Explanation:


QUESTION 3
In a PIM-SM network, which type of node helps to build a tree towards an unknown multicast
source?

A. DIS
B. RP
C. DR
D. BSR

Answer: B

Explanation:


QUESTION 4
Which statement is true about MVRP?

A. It allows you to split a broadcast domain into multiple isolated broadcast subdomains.
B. It dynamically manages VLAN registration in a LAN.
C. It maps multiple independent spanning-tree instances onto one physical topology.
D. It is a Layer 2 protocol that facilitates network and neighbor discovery.

Answer: A

Explanation:


QUESTION 5
Which statement is true about LLDP?

A. It allows you to split a broadcast domain into multiple isolated broadcast subdomains.
B. It dynamically manages VLAN registration in a LAN.
C. It maintains a separate spanning-tree instance for each VLAN.
D. It is a Layer 2 protocol that facilitates network and neighbor discovery.

Answer: D

Explanation:

 

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