100% Pass 2026 Juniper Authoritative JN0-650: Enterprise Routing and Switching, Professional (JNCIP-ENT) Exam Quick Prep

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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Layer 2 Authentication and Access Control: This domain examines network access control mechanisms including 802.1x, MAC RADIUS, captive portal, server fail fallback, guest VLANs, and multi-method authentication considerations.
Topic 2
  • 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 3
  • 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 4
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.
Topic 5
  • 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.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q112-Q117):

NEW QUESTION # 112
In the context of Junos, what is the purpose of the 'multicast' routing-options configuration hierarchy?

Answer: C


NEW QUESTION # 113
When configuring Q-in-Q tunneling, which type of tunneling involves the swapping of S-VLANs with C- VLANs?

Answer: A

Explanation:
In a Juniper Q-in-Q (Layer 2 tunneling) environment, VLAN rewrites (specifically the swap operation) provide the most granular control over how customer traffic (C-VLANs) is mapped to service provider traffic (S-VLANs).
* VLAN Rewrites (The Swap Operation): This method involves replacing the incoming customer VLAN tag with a service provider tag as the frame enters the tunnel. This is technically a " swap " because the original C-VLAN tag is removed and the S-VLAN tag is written in its place. At the egress of the tunnel, the S-VLAN tag is swapped back for the original C-VLAN tag. This is often used when different customers use the same C-VLAN IDs and the provider needs to keep them unique within their core.
* Many-to-Many: This is a mapping style where multiple customer VLANs are mapped to multiple service provider VLANs, but it typically relies on the " push " (stacking) operation rather than a literal " swap " of the tag itself.
* All-in-One: This is the simplest form of Q-in-Q where all traffic entering an interface is " pushed " into a single S-VLAN tag, regardless of any existing C-VLAN tags. No swapping occurs; the original tags are simply buried under the new provider tag.
* L2PT (Layer 2 Protocol Tunneling): This is a feature used to tunnel Layer 2 control protocols (like STP, CDP, or LLDP) across a provider network by encapsulating them or changing their destination MAC addresses. It does not involve the swapping of VLAN tags.


NEW QUESTION # 114
Click the Exhibit button.

Referring to the exhibit, what is required for the BGP peering to establish?

Answer: A

Explanation:
Since router1 is using a loopback (192.168.1.1) as its local BGP address, the BGP peer (router2) must establish a session toward this loopback. The remote peer (172.16.1.1) is two hops away, so the multihop option must be configured under the BGP group to allow the TCP session to succeed.


NEW QUESTION # 115
Exhibit

Referring to the exhibit. R2 receives a packet from the multicast source on its ge-0/0/4 0 interface.
Which two statements are correct in this scenario? (Choose two.)

Answer: B,D

Explanation:
The exhibit illustrates a PIM multicast environment where router R2 has received a multicast packet from Source 1 (192.168.100.10) on its ge-0/0/4.0 interface. To prevent loops, PIM-SM uses a mechanism called Reverse Path Forwarding (RPF).
* RPF Check Process (Option A): When a multicast packet arrives, the router performs an RPF check by looking up the source's IP address in its unicast routing table (typically inet.0).
* The exhibit's command output, show multicast rpf 192.168.100.10, explicitly shows that for the source network $192.168.100.0/24$, the RPF interface is ge-0/0/1.0.
* Because the packet actually arrived on ge-0/0/4.0 instead of the expected ge-0/0/1.0 interface, the RPF check fails.
* Packet Discard (Option C): According to standard PIM-SM operation in Junos OS 24.4, if a multicast packet fails the RPF check-meaning it arrived on an interface that the router does not use to reach the source via unicast-the packet is discarded. This is a fundamental loop-prevention mechanism that ensures multicast traffic is only accepted from the shortest path toward the source.
* Option B is incorrect because the router will not add any interfaces to the Outgoing Interface List (OIL) for a packet that fails the initial RPF check.
* Option D is incorrect because the exhibit clearly shows the interface in the RPF table (ge-0/0/1.0) is different from the interface where the packet was received (ge-0/0/4.0).


NEW QUESTION # 116
Your organization uses 802.1X with a RADIUS server. If the RADIUS server stops responding, you want the fallback action to continue to permit access for devices that currently have authorization but deny any new access attempts. Which fallback action provides this capability?

Answer: B

Explanation:
The use-cache fallback action allows devices that have already been authorized by 802.1X to continue accessing the network if the RADIUS server becomes unavailable, while blocking any new authentication attempts. This provides continuity for authorized users without opening access to unauthorized devices.


NEW QUESTION # 117
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