JN0-650 - Enterprise Routing and Switching, Professional (JNCIP-ENT)–The Best Pr

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q25-Q30):NEW QUESTION # 25
When configuring Q-in-Q tunneling, which type of tunneling involves the swapping of S-VLANs with C- VLANs?

• A. L2PT
• B. VLAN rewrites
• C. all-in-one
• D. many-to-many
  

Answer: B
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 # 26
Exhibit


You are asked to configure VLAN load balancing on your network using MSTP. Referring to the exhibit, which two statements are correct? (Choose two.)

• A. Switch1 will be the root bridge for msti 2.
• B. Switch1 will assume the role of root bridge for both mstil and msti2 if Switch2 goes down.
• C. Switch 1 will not assume the role of root bridge for both mstil and msti2 if Switch2 goes down.
• D. Switch1 will be the root bridge for msti 1.
  

Answer: A,B
Explanation:
The exhibit shows the MSTP configuration for two switches, switch1 and switch2. MSTP allows you to group multiple VLANs into a single Multiple Spanning Tree Instance (MSTI), enabling different root bridges and topologies for different sets of VLANs.
* Root Bridge Election (Option B): For any Spanning Tree instance, the switch with the lowest bridge priority is elected as the root bridge.
* For msti 2, switch1 has a priority of 4k (4096), while switch2 has a priority of 8k (8192).
* Since 4096 < 8192, switch1 is elected the root bridge for msti 2.
* Failover Behavior (Option D): Spanning Tree is designed for redundancy. If a primary root bridge fails, the remaining switches in the network re-elect a new root based on the next lowest priority.
* If switch2 goes down, switch1 becomes the only switch in the region.
* Regardless of its original priority (4k or 8k), switch1 will take over as the root bridge for both msti 1 and msti 2 because there are no other contenders with a better (lower) priority.
* Incorrect Statements: Option A is incorrect because for msti 1, switch2 has the lower priority (4k vs.
8k), making switch2 the root bridge. Option C is incorrect because it contradicts the fundamental high- availability nature of Spanning Tree.

NEW QUESTION # 27
Exhibit.
Referring to the exhibit, which statement is correct?

• A. The OSPF state will be stuck in the 2Nay state
• B. The OSPF state will be stuck in the Exstart state
• C. The device with the highest IP address is elected as the DR.
• D. The device with the lowest IP address is elected as the DR.
  

Answer: A
Explanation:
In OSPF, the election of aDesignated Router (DR)and aBackup Designated Router (BDR)is mandatory on broadcast and non-broadcast multi-access (NBMA) network types to manage link-state database synchronization efficiently.
The exhibit shows that bothdevice1anddevice2have their OSPF interface priority explicitly set to0. According to the Junos OS 24.4 OSPF implementation:
* Ineligibility (Priority 0):A router with a priority of 0 is strictlyineligibleto be elected as a DR or BDR for that segment.
* No Election Possible:When every router on a broadcast segment has a priority of 0, the election process cannot complete because there are no eligible candidates to fill the required roles.
* State Behavior (Stuck in 2-Way):In OSPF adjacency formation, the2-Way stateindicates that bidirectional communication has been established (each router has seen itself in the other's Hello packets). However, to progress to theExstartandExchangestates on a multi-access network, routers must first identify a DR and BDR.
* Result:Since neither router can become the DR, they both wait indefinitely for a third party (with priority > 0) to take the lead. Consequently, the OSPF adjacency will bestuck in the 2-Way state.
Adjacencies only reach theFullstate with the DR and BDR; routers in a "DROther" role remain in 2- Way with each other.
Option A and Dare incorrect because the router ID (IP address) only acts as a tiebreaker if priorities are equal andgreater than 0.Option Bis incorrect because routers cannot reach the Exstart state (where they negotiate master/slave for database exchange) without first having a DR/BDR elected.

NEW QUESTION # 28
You are implementing an EVPN-VXLAN edge-routed bridging design using Layer 3 gateway operations. In this scenario, which statement is correct?

• A. Each distribution switch has unique IP addresses for IRB interfaces; routing protocols run on IRB interfaces
• B. Distribution switches share the same anycast IP addresses for IRB interfaces; routing occurs at the distribution layer.
• C. Only core switches have IRB interfaces; all Layer 3 routing happens in the core.
• D. IRB interfaces are disabled; all routing happens through external routers only.
  

Answer: B
Explanation:
In an EVPN-VXLAN Edge-Routed Bridging (ERB) architecture, also known as a collapsed fabric, the Layer
3 default gateway functionality is moved from the core/spine layer down to the edge (the leaf or distribution layer).
Anycast Gateways: To support seamless host mobility and redundancy, multiple distribution/leaf switches are configured with the same anycast IP address and MAC address on their IRB interfaces for a given VLAN.
This allows a host to move between different switches without needing to update its default gateway configuration or ARP cache.
Distributed Routing: Routing occurs locally at the edge (distribution layer). Traffic destined for a different subnet is routed by the first switch it hits (the ingress leaf), rather than being backhauled to a central core router.
Symmetric vs. Asymmetric IRB: Junos OS 24.4 supports both models, but the ERB design typically utilizes symmetric routing for better scalability, where each leaf only needs to know the routes for its locally connected VNIs and uses a transit VNI for inter-subnet communication.
Option A is incorrect because while unique IPs can be used (Method 1 in some docs), the defining characteristic of an efficient ERB design is the use of shared Anycast IPs for the gateway. Option C describes a Centrally-Routed Bridging (CRB) design, not ERB.

NEW QUESTION # 29
According to IETF standards, which two statements are correct about EVPN/VXLAN deployments? (Choose two.)

• A. Up to 16 million EVPN broadcast domains can exist.
• B. Up to 16 million VXLAN broadcast domains can exist.
• C. Layer 2 frames within the same broadcast domain are forwarded unchanged.
• D. IP packets within the same broadcast domain are forwarded unchanged.
  

Answer: B,C
Explanation:
The IETF standards for EVPN-VXLAN define the scalability and forwarding behavior of the architecture.
* VXLAN Scale (Statement B):The Virtual Network Identifier (VNI) is a24-bit fieldin the VXLAN header. This allows for up to $2
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