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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • EVPN: This section addresses Ethernet VPN technology for Layer 2 over Layer 3 connectivity, covering EVPN route types, VXLAN encapsulation, and multi-homing configurations.
Topic 2
  • Class of Service (CoS): This domain covers QoS mechanisms in Junos including CoS processing, header fields, forwarding classes, classification, policers, schedulers, drop profiles, shaping, and rewrite rules.
Topic 3
  • Interior Gateway Protocols (IGPs): This domain covers internal routing protocols operating within a single autonomous system, including OSPFv2, OSPFv3, and routing policy implementation, along with configuration, troubleshooting, and monitoring skills.
Topic 4
  • IP Multicast: This domain addresses one-to-many communication using multicast routing, covering addressing, ASM vs SSM models, RPF, IGMP
  • snooping, PIM sparse-mode, rendezvous points, Anycast RP, MSDP, and routing policies.
Topic 5
  • BGP: This section focuses on Border Gateway Protocol operations including route selection, next hop resolution, BGP attributes, communities, load balancing, IPv4
  • IPv6 address families, advanced options, and routing policy implementation.
Topic 6
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q77-Q82):

NEW QUESTION # 77
Which two statements are true regarding the two-rate tricolor token bucket algorithm? (Choose two.)

Answer: A,C


NEW QUESTION # 78
You have created a private community VLAN called RND The private community VLAN works fine within switch S1, but traffic in the private RND community VLAN does not reach VLAN members connected to switch S2.
Which statement is correct in this scenario?

Answer: B

Explanation:
Private VLANs (PVLANs) allow for granular port isolation within a single broadcast domain. When extending a PVLAN across multiple switches (S1 to S2), the secondary VLANs (Community or Isolated) must be preserved across the trunk links.
* 802.1Q Tagging (Option B):For traffic from aCommunity VLAN (RND)to reach members on a different switch, the Community VLAN must have its own802.1Q VLAN tag (VLAN ID)associated with it. When a frame from a community port on S1 traverses the trunk to S2, it is tagged with this specific secondary VLAN ID. S2 receives the tagged frame, identifies it as belonging to the RND community, and forwards it to the appropriate community or promiscuous ports.
* Why it fails without a tag:If the RND community is only defined locally on S1 without a global VLAN ID, the trunk port will not know how to distinguish that traffic from the Primary VLAN or other communities.
* Incorrect Options:Option Ais incorrect because the community VLANmusthave a different tag than the parent (Primary) VLAN to maintain the internal PVLAN logic.Option Cis incorrect because stripping tags would lead to the traffic being merged into the native VLAN or dropped.Option Dis incorrect because RND is a community VLAN; changing it to an isolated VLAN would change its behavior (preventing communication between members of that same group).


NEW QUESTION # 79
OSFP is stuck in the ExStart state.
What is a common cause of this problem?

Answer: B


NEW QUESTION # 80
Which multicast protocol is responsible for creating a shortest path tree for each source?

Answer: B


NEW QUESTION # 81
Which two statements are correct about OSPFv2 and OSPFv3? (Choose two.)

Answer: C,D

Explanation:
OSPFv2 (IPv4) and OSPFv3 (IPv6) share many fundamental concepts, such as the SPF algorithm and the use of areas, but they have distinct differences in how they handle prefix information and LSA headers in Junos OS.
Backbone Requirement (Option C): Both OSPFv2 and OSPFv3 utilize a hierarchical structure. In both versions, all areas must connect to a central Area 0 (the backbone) to allow for inter-area routing. If an area is not physically connected to Area 0, a virtual link must be established.
Flooding Scope (Option D): One of the significant architectural changes in OSPFv3 is the inclusion of the flooding scope directly into the LSA header. In OSPFv3, the LS Type field is expanded to 16 bits, where the top three bits define the flooding scope (e.g., Link-local, Area, or AS scope). This allows routers to understand how far an LSA should be propagated without needing to understand the specific LSA type itself.
LSA Prefix Information (Option A): This statement is misleading. In OSPFv2, Router and Network LSAs (Type 1 and 2) carry both topology and prefix information. However, a key design goal of OSPFv3 was to separate topology from prefix information. In OSPFv3, Type 1 and 2 LSAs only describe the topology, while prefixes are carried in new LSA types: Intra-Area-Prefix-LSAs (Type 9) and Link-LSAs (Type 8).
Processing (Option B): OSPFv2 is processed " per-subnet " because it forms adjacencies based on IPv4 subnets. OSPFv3 is processed " per-link " , meaning it forms adjacencies between interfaces on the same physical link regardless of whether they share a common IPv6 prefix.


NEW QUESTION # 82
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