JN0-650 Free Certification Exam Material from Fast2test with 72 Questions
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Juniper JN0-650 Exam Syllabus Topics:
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NEW QUESTION # 34
Exhibit
You are deploying a new campus switching environment using various EX Series switch models. The devices attached to one of the new EX Senes switches include IP phones, loT devices, and wireless access points (APs) requiring power over Ethernet (PoE) with varying power requirements. A sample output from one of these switches is shown in the exhibit.
In this scenario, which two statements are correct? (Choose two.)
- A. The switch is capable of supplying up to 30 W of power to attached PoE devices.
- B. Port ge-0/0/0 is enabled and has dynamically learned maximum power and device class designations.
- C. The switch is capable of supplying up to 60 W of power to attached PoE devices.
- D. Port ge-0/0/0 is enabled and has its maximum power and device class designations statically configured.
Answer: A,B
Explanation:
The exhibit shows the output of the show poe interface command on a Juniper switch.
* VTEP Power Capabilities (Statement D): The exhibit shows the Pair/Mode as 2P/AT, which refers to the IEEE 802.3at (PoE+) standard. Under this standard, a switch can supply up to 30 W of power per port to attached devices (PDs). * Dynamic Learning (Statement C): Looking at the Max power column for port ge-0/0/0, it shows 19.5W(L). The (L) indicator signifies that the power has been dynamically learned (negotiated) via LLDP or hardware classification, rather than being statically configured by an administrator. Additionally, it has identified the device as Class 4, which is a standard dynamic classification for PoE+ devices.
* Why others are incorrect: Statement A (60 W) refers to the 802.3bt (PoE++) standard, which is not indicated here. Statement B is incorrect because the "(L)" confirms the configuration is not static.
NEW QUESTION # 35
Which two statements are true regarding traffic forwarding in an OSPF environment? (Choose two.)
- A. Inter-area routes are always preferred over intra-area routes.
- B. The shortest cost path is always chosen for forwarding.
- C. Intra-area routes are always preferred over inter-area routes.
- D. The shortest cost path may not be chosen for forwarding.
Answer: C,D
NEW QUESTION # 36
You are deploying a three-stage EVPN environment with VXLAN using EX and QFX Series switches. The leaf devices will perform the gateway services. Which two statements are correct in this scenario? (Choose two.)
- A. Both the leaf and spine devices must support VXLAN capabilities.
- B. The spine devices will function as VTEPs.
- C. The leaf devices will function as VTEPs
- D. Only the leaf devices must support VXLAN capabilities.
Answer: A,C
Explanation:
In a three-stage EVPN-VXLAN fabric (Spine-Leaf architecture) where leaf devices perform the gateway services (Edge-Routed Bridging or ERB):
* VTEP Functionality (Option B): Leaf devices act as VXLAN Tunnel End Points (VTEPs). They are responsible for encapsulating Ethernet frames from locally connected hosts into VXLAN packets for transport across the IP fabric and de-encapsulating incoming VXLAN packets.
* Fabric Support (Option C): In a standard Juniper IP fabric design, both the leaf and spine devices are typically expected to support VXLAN and EVPN capabilities. While spines in an ERB design might only perform IP forwarding in the underlay, they often participate in the BGP control plane (as Route Reflectors) or provide the ability to transition to Centrally-Routed Bridging (CRB) where spines would act as gateways.
* Incorrect Options: Option A is incorrect because the entire fabric infrastructure must be "VXLAN aware" in terms of MTU settings and routing capability to support the overlay. Option D is incorrect because in an ERB design, the spine devices are high-speed transit nodes and do not terminate VXLAN tunnels; only the edge (leaf) devices act as VTEPs.
NEW QUESTION # 37
Which two statements are correct about a functional ESI LAG interface? (Choose two.)
- A. The LACP system ID must be the same.
- B. The ESI values must be the same.
- C. The LACP system ID must be different.
- D. The ESI values must be different.
Answer: A,B
NEW QUESTION # 38
What is the primary function of MSDP within a multicast network?
- A. To provide a mechanism for RP redundancy.
- B. To encrypt multicast traffic across public networks.
- C. To synchronize multicast routing information between multiple domains.
- D. To reduce multicast traffic by summarizing routes.
Answer: C
NEW QUESTION # 39
Which of the following is an application of MSDP in a multicast network?
- A. To reduce the size of the multicast routing table.
- B. To allow the advertisement of multicast sources between AS boundaries.
- C. To manage PIM-SM state information more effectively.
- D. To encrypt multicast traffic between the sender and receivers.
Answer: B
NEW QUESTION # 40
Which two statements are correct regarding the behavior shown in the exhibit? (Choose two.)
- A. The ge-1/1/0 interface is configured as secondary for Area 100.
- B. The ge-1/1/0 interface is configured as secondary for Area 0.
- C. The router is not an ABR.
- D. The router is an ABR.
Answer: A,D
NEW QUESTION # 41
Which two statements correctly describe how EX Series switches use captive portal for Layer 2 authentication? (Choose two.)
- A. The captive portal is the default Layer 2 authentication method that is applied before other methods such as 802 1X or MAC RADIUS.
- B. The captive portal authentication allowlist works for devices that do not have HTTP capabilities.
- C. The captive portal is configured on Layer 3 interfaces and does not participate in Layer 2 authentication on EX Series switches.
- D. The captive portal is used as a fallback mechanism for clients that fail 802.1X or MAC RADIUS authentication.
Answer: B,D
Explanation:
In Junos OS 24.4, Captive Portal is used as a web-based authentication method for Layer 2 network access control, often in environments where 802.1X is not feasible for all users.
Fallback Mechanism (Option D): On EX Series switches, Juniper supports a flexible authentication order. By default, the switch attempts authentication in the order of 802.1X, then MAC RADIUS, and finally Captive Portal. If a client fails both 802.1X and MAC RADIUS, the switch can fall back to Captive Portal to redirect the user to a login page.
MAC Allowlist (Option B): Captive Portal relies on intercepting HTTP/HTTPS traffic to redirect users.
However, " headless " devices like printers or cameras lack web browsers and cannot interact with the portal.
To accommodate these, Junos allows administrators to configure an authentication allowlist (or whitelist), which identifies these devices by their MAC addresses and permits them to bypass the portal entirely.
Precedence (Option A): This is incorrect because Captive Portal is generally the last method in the default sequence, not the first.
Layer 2 Participation (Option C): While Captive Portal requires a Layer 3 interface (RVI/IRB) for the redirection process, it is explicitly used to control Layer 2 access on EX Series switches.
NEW QUESTION # 42
What does the MSDP SA message contain?
- A. The list of all multicast sources available in the network.
- B. The RP address and the multicast group address.
- C. The multicast group address and the source-specific multicast distribution tree.
- D. The source address and the group address for which it is a source.
Answer: D
NEW QUESTION # 43
Exhibit
As shown in the exhibit, you have implemented CoS classifiers using Differentiated Services Code Point (DSCP) In this scenario, which two statements are correct? (Choose two.)
- A. This custom DSCP classifier must be associated with physical interfaces.
- B. The configuration imports all default classification assignments that are not specified.
- C. The default classification assignment overwrites all specified classifications
- D. This custom DSCP classifier must be associated with logical interfaces.
Answer: B,D
Explanation:
The exhibit shows a customBehavior Aggregate (BA) classifiernamed my-classifier for the Differentiated Services Code Point (DSCP) protocol.
* Importing Defaults (Statement C):The configuration line import default; is crucial. In Junos OS, when you create a custom classifier, you can use this statement toimport the default mapping tablefor all code points that you have not explicitly defined in the current block. This ensures that only the specific traffic types you care about are customized while the rest follows industry-standard defaults.
* Logical Interface Association (Statement A):In the Junos class-of-service hierarchy, classifiers are typically applied tological interfaces(e.g., ge-0/0/0.0). While they can sometimes be applied at a higher level, the standard practice for enterprise routing and switching is to associate them with the logical unit to provide granular control over subinterfaces or VLAN-tagged traffic.
* Why others are incorrect:Statement B is less accurate because the primary binding point in Junos is the unit (logical interface). Statement D is incorrect because the specific classifications defined in the custom blockoverridethe defaults; they are not overwritten by them.
NEW QUESTION # 44
Exhibit
Referring to the exhibit output, which statement is correct?
- A. The output shows the route distinguisher of the device sending the EVPN Type 2 routes
- B. The device with an IP address of 192.168.100 2 is attached to VNI 5010
- C. The output shows the router ID of the device sending the EVPN Type 2 routes
- D. IP addresses 10.1.1.1 and 10.1 2.3 are connected to the same VNI.
Answer: A
Explanation:
The exhibit displays the default-switch.evpn.0 routing table, which is used on Juniper leaf devices to store EVPN Type 2 (MAC/IP) routes.
* Route Distinguisher (Option C):In EVPN, theRoute Distinguisher (RD)is an 8-byte prefix added to a route to make it unique within the BGP control plane. The RD format in the exhibit is <IP-Address>:
<Identifier>.
* For example, the prefix 2:192.168.100.1:1::5010::... indicates an EVPN Type 2 route (2:) where
192.168.100.1:1 is theRoute Distinguisher.
* This RD identifies the specific routing instance on the originating VTEP that advertised the MAC
/IP address.
* Option A is incorrect:The RD 192.168.100.2:1 does not necessarily mean thehostdevice has that IP; it means theoriginating switchhas that router ID/IP used for its RD.
* Option B is incorrect:While the RD oftenincorporatesthe router ID, the RD itself is the full string (e.
g., 192.168.100.1:1), which is distinct from the raw Router ID used in the BGP summary.
* Option D is incorrect:Looking at the entries for 10.1.1.1 and 10.1.2.3, they are associated with different identifiers in the RD strings (5010 and 5020 respectively), which typically map to different VNIs or bridge domains.
NEW QUESTION # 45
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. Switch1 will be the root bridge for msti 1.
- D. Switch 1 will not assume the role of root bridge for both mstil and msti2 if Switch2 goes down.
Answer: A,B
Explanation:
The exhibit shows the MSTP configuration for two switches,switch1andswitch2. 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 thelowest bridge priorityis elected as the root bridge.
* Formsti 2, switch1 has a priority of4k(4096), while switch2 has a priority of8k(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.
* Ifswitch2goes down, switch1 becomes the only switch in the region.
* Regardless of its original priority (4k or 8k), switch1 will take over as theroot bridge for both msti 1 and msti 2because there are no other contenders with a better (lower) priority.
* Incorrect Statements:Option Ais incorrect because for msti 1, switch2 has the lower priority (4k vs.
8k), making switch2 the root bridge.Option Cis incorrect because it contradicts the fundamental high- availability nature of Spanning Tree.
NEW QUESTION # 46
Which protocol must you enable to tunnel Layer 2 protocols, such as RSTP or LLDP, across a Q-in-Q tunnel?
- A. L2PT
- B. L2TP
- C. LDAP
- D. MVRP
Answer: A
NEW QUESTION # 47
What is the primary benefit of implementing BGP multipath in a network?
- A. To simplify the BGP routing policy.
- B. To decrease BGP convergence time.
- C. To increase the number of hops in the AS path.
- D. To improve network redundancy and load balancing.
Answer: D
NEW QUESTION # 48
Exhibit
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The BGP configuration includes the multipath parameter.
- B. The BGP configuration is for IBGP
- C. This route has two next hops available.
- D. This route has a hidden next hop.
Answer: A,C
Explanation:
The exhibit shows the output of the command show route protocol bgp on router R1 for the prefix 172.16.10.1
/32. To determine the correct characteristics of this route, we analyze the specific BGP attributes and next-hop information provided in the routing table entry:
Multipath Parameter (Option B): The routing table shows two distinct paths for the prefix 172.16.10.1/32. The first path has two next hops (192.168.10.1 and 192.168.20.1) and is marked with the plus symbol (+) and the asterisk (*), indicating it is both an active and the best route. The presence of multiple next hops being used simultaneously for a single BGP path is a clear indication that the multipath parameter is enabled in the BGP configuration. In Junos OS, BGP multipath allows the installation of multiple equal-cost BGP paths into the forwarding table to facilitate load balancing.
Available Next Hops (Option C): The output explicitly lists two functional next hops for the active path:
192.168.10.1 via ge-1/0/0.2 and 192.168.20.1 via ge-1/0/1.3. Both show an outgoing interface, confirming that this route has two next hops available for traffic forwarding.
IBGP vs. EBGP (Option A): The BGP routes shown have an AS path of 200 I. This indicates the routes were learned from an external Autonomous System (AS 200). Furthermore, the protocol preference is 170. In Junos OS, the default preference for External BGP (EBGP) is 170, whereas the default preference for Internal BGP (IBGP) is 200. Therefore, this configuration is for EBGP, not IBGP.
Hidden Next Hops (Option D): The summary line at the top of the exhibit mentions that there are " 2 hidden " routes in the inet.0 table. However, these hidden routes are not the next hops for the 172.16.10.1/32 prefix. A hidden route is a prefix that was rejected by policy or has an unreachable next hop; it is not a " hidden next hop " belonging to an active route.
NEW QUESTION # 49
You run a multivendor switching environment where you have configured VSTP. You have 450 VLANs and notice that some of your VLANs do not function properly. How should you change the configuration to get all
450 VLANs working?
- A. Include the force-version stp; statement in your configuration
- B. Increase the bridge priority on all VLANs to at least 16k.
- C. Set the VLAN max-age to 3600 or more.
- D. Enable RSTP to handle additional VLANs.
Answer: D
Explanation:
VSTP (VLAN Spanning Tree Protocol) is Juniper ' s implementation that provides a separate spanning tree instance for each VLAN, ensuring compatibility with Cisco ' s PVST+. However, it has significant scaling limitations:
Instance Limits: On many Juniper EX and QFX series switches, VSTP is restricted to a maximum of 253 or
510 VLAN instances depending on the software version (ELS vs. non-ELS). In your scenario, having 450 VLANs exceeds the standard 253-instance limit found on many platforms.
The Solution (Option B): When the number of VLANs exceeds the VSTP capacity, the recommended best practice is to enable RSTP (Rapid Spanning Tree Protocol). Unlike VSTP, RSTP runs a single spanning tree instance for the entire switch, regardless of how many VLANs are configured. This ensures that all 450 VLANs are protected from loops without hitting the hardware ' s instance-count limit.
Other Options: Option A (force-version) only affects the BPDU format for compatibility but doesn ' t solve the instance limit. Option C and Option D are parameter tuning actions that do not address the architectural limitation of the number of running instances.
NEW QUESTION # 50
Which three types of ports are used for Junos Fusion Enterprise? (Choose three. )
- A. extended port
- B. authenticated port
- C. designated port
- D. uplink port
- E. cascade port
Answer: A,D,E
NEW QUESTION # 51
Which three statements are true about strict-high priority queues? (Choose three.)
- A. When a strict-high queue goes into negative credits, it will maintain a strict DSCP marking.
- B. In systems that support strict-high and high priority queues, traffic in the strict-high queue is completely emptied, and then high priority queue traffic is processed.
- C. In systems that support multiple strict-high priority queues, traffic in the strict-high queue is processed in a round-robin fashion.
- D. When a strict-high queue can never go into negative credits and will always transmit the traffic in the queue.
- E. In systems that support strict-high and high priority queues, traffic in these two priorities is processed in a round-robin fashion.
Answer: B,C,D
NEW QUESTION # 52
Which two protocols are associated with the establishment of a Rendezvous Point in multicast networking? (Choose two)
- A. VRRP
- B. Auto-RP
- C. LACP
- D. Bootstrap Protocol (BSR)
Answer: B,D
NEW QUESTION # 53
Exhibit
You are deploying a new campus switching environment using various EX Series switch models. The devices attached to one of the new EX Senes switches include IP phones, loT devices, and wireless access points (APs) requiring power over Ethernet (PoE) with varying power requirements. A sample output from one of these switches is shown in the exhibit.
In this scenario, which two statements are correct? (Choose two.)
- A. The switch is capable of supplying up to 30 W of power to attached PoE devices.
- B. Port ge-0/0/0 is enabled and has dynamically learned maximum power and device class designations.
- C. The switch is capable of supplying up to 60 W of power to attached PoE devices.
- D. Port ge-0/0/0 is enabled and has its maximum power and device class designations statically configured.
Answer: A,B
Explanation:
The exhibit shows the output of the show poe interface command on a Juniper switch.
VTEP Power Capabilities (Statement D): The exhibit shows the Pair/Mode as 2P/AT, which refers to the IEEE 802.3at (PoE+) standard. Under this standard, a switch can supply up to 30 W of power per port to attached devices (PDs). * Dynamic Learning (Statement C): Looking at the Max power column for port ge-0/0
/0, it shows 19.5W(L). The (L) indicator signifies that the power has been dynamically learned (negotiated) via LLDP or hardware classification, rather than being statically configured by an administrator. Additionally, it has identified the device as Class 4, which is a standard dynamic classification for PoE+ devices.
Why others are incorrect: Statement A (60 W) refers to the 802.3bt (PoE++) standard, which is not indicated here. Statement B is incorrect because the " (L) " confirms the configuration is not static.
NEW QUESTION # 54
Juniper devices use the token bucket algorithm for policing.
Which two statements are true regarding the token bucket algorithm? (Choose two.)
- A. Policers do not reduce the speed of an interface.
- B. Policers reduce the speed of an interface.
- C. Policers transmit streams of traffic at the maximum interface speed until the burst rate is reached.
- D. Policers enforce gaps between transmitted packets.
Answer: A,D
NEW QUESTION # 55
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?
- A. deny
- B. vlan-name
- C. permit
- D. use-cache
Answer: D
Explanation:
Junos OS 24.4 provides several server-failover options for 802.1X authentication to maintain network availability when the RADIUS server is unreachable.
* Fallback Behavior (Option D):Theuse-cachefallback action allows the switch to consult its local cache of previously authenticated MAC addresses.
* If a device was already authorized and its information is in the cache, the switch willcontinue to permit accessbased on those cached credentials.
* However, if a new device (not in the cache) attempts to connect while the server is down, the switch cannot verify its credentials and willdeny the access attempt. This matches the specific requirement to permit authorized devices while denying new ones.
* Other Fallback Options:
* permit (Option C):This would allowalldevices (even new ones) to access the network, typically in a restricted "guest" or "bypass" VLAN.
* deny (Option A):This would drop all traffic from all devices on the port if the server is unreachable.
* vlan-name (Option B):This moves authenticated or unauthenticated users into a specific fallback VLAN.
NEW QUESTION # 56
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