Enterprise Routing and Switching Professional (JNCIP-ENT)
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Exam Code
JN0-649
Exam Name
Enterprise Routing and Switching Professional (JNCIP-ENT)
Questions
65 Questions Answers With Explanation
Update Date
February 11,2026
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Juniper JN0-649 Sample Question Answers
Question # 1
You are deploying IP phones in your enterprise networks. When plugged in, the IP phones
must be automatically provided with the correct VLAN ID needed for sending voice traffic to
the EX Series switches.
In this scenario, which two solutions are required to accomplish this task? (Choose two.)
A. Enable LLDP-MED on appropriate access interfaces. B. Create two VLANs and assign them as VLAN members to the appropriate access
interfaces. C. Enable the voice VLAN feature with the appropriate access interfaces and VLAN ID for
voice traffic. D. Use LLDP on appropriate interfaces.
Answer: A,C
Question # 2
Your network is multihomed to two ISPs. The BGP sessions are established; however, the
ISP peers are not receiving any routes.
Which two statements are correct about troubleshooting your configuration? (Choose two.)
A. Verify the import policies on your router. B. Verify that the BGP routes are active in your routing table. C. Verify the export policies on your router. D. Verity that the multi hop settings are configured on your router.
Answer: C,D
Question # 3
BGP multipath or multi hop are not configured in your network.
In this scenario, what is the correct sequence for BGP active route selection?
A.
higher local preference
shortest AS path lowest peer address
lowest router ID lower origin code B.
higher local preference
shortest AS path
lower origin code
lowest router ID
lowest peer address C.
higher local preference
lowest router ID
lowest peer address
lower origin code
shortest AS path D.
higher local preference
shortest AS path
lowest router ID
lowest peer address
lower origin code
Answer: B
Explanation: BGP Path Selection process follows this order
1.Weight (Bigger is better)
2. Local preference (Bigger is better)
3. Self originated (Locally injected is better than iBGP/eBGP learned)
4. AS-Path (Smaller is better)
5. Origin
6. MED (Smaller is better)
7. External (Prefer eBGP over iBGP)
8. IGP cost (Smaller is better)
9. EBGP Peering (Older is better)
10. Router- ID
A. IS-IS uses areas and an autonomous system. B. Level 1/2 routers automatically inject a default route to the nearest Level 1 router. C. Level 2 routers must share the same area address. D. Level 1 routers route traffic between autonomous systems.
Answer: A
Explanation: Level 1/2 routers automatically inject a default route to the nearest Level 1
router. It's the other way around
Question # 5
Your enterprise network is running BGP VPNs to support multitenancy. Some of the
devices with which you peer BGP do not support the VPN NLRI. You must ensure that you
do not send BGP VPN routes to the remote peer.
Which two configuration steps will satisfy this requirement? (Choose two.)
A. Configure an import policy on the remote peer to reject the routes when they are
received. B. Configure an export policy on the local BGP peer to reject the VPN routes being sent to
the remote peer. C. Configure a route reflector for the VPN NLRI. D. Configure the apply-vpn-export feature on the local BGP peer.
There are two BGP routes to 10.200.200.0/24 received from twoexternal peers. Route 1
comes from a neighbor with a router ID of 10.10.100.1 and a peer IP address of 10.10.30.1, and route 2 comes from a neighbor with a router ID of 10.10.200.1 and a peer
IP address of 10.10.50.1. Both routes have the same MED value, origin value, AS path
length, and local preference number.
In this scenario, which statement is correct about the active route?
A. Route 1 will be active because of the peer IP address. B. Route 2 will be active because of the peer IP address. C. Route 1 will be active because of the router ID. D. Route 2 will be active because of the router ID.
Answer: C Explanation: The router determines the router ID for each peer that advertised a path to
the route destination. A lower router ID value is preferred over a higher router ID value. 10.
The router determines the peer ID for each peer that advertised a path to the router
destination. A lower peer ID value is preferred over a higher peer ID value. The peer ID is
the IP address of the established BGP peering session.
Question # 7
You want to create an OSPF area that only contains intra-area route information in the form
of Type 1 and Type 2 LSAs.
In this scenario, which area is needed to accomplish this task?
A. totally non-to-stubby area B. totally stubby area C. stub area D. non-to-stubby area
Answer: B
Explanation: A totally stubby area (TSA) is a stub area in which summary link-state
advertisement (type 3 LSAs) are not sent. A default summary LSA, with a prefix of 0.0.
0.0/0 is originated into the stub area by an ABR, so that devices in the area can forward all
traffic for which a specific route is not known, via ABR.
Question # 8
Your organization has recently acquired another company. You must carry all of the
company’s existing VLANs across the corporate backbone to the existing branch locations
without changing addressing and with minimal configuration.
Which technology will accomplish this task?
A. Q-in-Q all-in-one bundling B. PVLAN isolated VLAN C. MVRP registration normal D. EVPN-VXLAN any cast gateway
Answer: A
Question # 9
You are using 802.1X authentication in your network to secure all ports. You have a printer
that does not support 802.1X and you must ensure that traffic is allowed to and from this
printer without authentication.
In this scenario, what will satisfy the requirement?
A. MAC filtering B. MACsec C. static MAC bypass D. MAC RADIUS
You are asked to configure 802.1X on your access ports to allow only a single device to
authenticate.
In this scenario, which configuration would you use?
A. single supplicant mode B. multiple supplicant mode C. single-secure supplicant mode D. MAC authentication mode
Answer: C
Explanation: Single supplicant mode authenticates only the first end device that connects
to an authenticator port. All other end devices connecting to the authenticator port after the first has connected successfully, whether they are 802.1X-enabled or not, are permitted
access to the port without further authentication. If the first authenticated end device logs
out, all other end devices are locked out until an end device authenticates. Single-secure
supplicant mode authenticates only one end device to connect to an authenticator port. No
other end device can connect to the authenticator port until the first logs out.
Question # 11
What are two similarities between OSPFv2 and OSPFv3? (Choose two.)
A. virtual links B. support for multiple instances per link C. 32-bit router ID D. protocol processing per link, not per sub net
Answer: A,C
Question # 12
You are deploying new Juniper EX Series switches in a network that currently is
using Cisco’s Per-VLAN spanning tree plus (PVST+) and you must provide compatibility
with this environment.
Which spanning tree protocol do you deploy in this scenario?
A. STP B. MSTP C. VSTP D. RSTP
Answer: B
Question # 13
You are asked to establish interface level authentication for users connecting to your
network. You must ensure that only corporate devices, identified by MAC addresses, are
allowed to connect and authenticate. Authentication must be handled by a centralized
server to increase scalability.
Which authentication method would satisfy this requirement?
A. MAC RADIUS B. captive portal C. 802.1X with single-secure supplicant mode D. 802.1X with multiple supplicant mode
If both MAC RADIUS and 802.1X authentication are enabled on the interface, the switch
first sends the host three EAPoL requests to the host. If there is no response from the host,
the switch sends the host’s MAC address to the RADIUS server to check whether it is a
permitted MAC address. If the MAC address is configured as permitted on the RADIUS
server, the RADIUS server sends a message to the switch that the MAC address is a
permitted address, and the switch opens LAN access to the nonresponsive host on the
interface to which it is connected.
Question # 14
When using wide metrics, which two statements about route advertisement between IS-IS
levels are correct?(Choose two.)
A. Level 1 and Level 2 routers do not advertise Level 2 routes into the Level 1 area by
default. B. Level 1 routes are advertised to Level 2 routers by default. C. If wide-metrics-only is configured, Level 1 routes are not advertised to Level 2 routers by
default. D. Level 1 routes advertised as external routes into Level 1 are not advertised to any Level
2 routers by default.
Answer: A,C
Question # 15
Which two statements are correct about the deployment of EVPN-VXLAN on QFX Series
devices?(Choose two.)
A. Type 1 route advertisements always have the single-active flag set to 1. B. Junos OS supports underlay replication for BUM traffic forwarding. C. Junos OS supports ingress replication for BUM traffic forwarding. D. Type 1 route advertisements always have thesingle-active flag set to 0.
Answer: C,D
Explanation: BUM Traffic Forwarding
Junos devices that use MPLS encapsulation for EVPNs can only use ingress replication at
this time.
Ingress replication means, to flood traffic to remote PE routers, the traffic has to be
replicated, once for each remote PE router The EVPN label for this BUM traffic is learned per PE router from the route type 3, inclusive
multicast Ethernet tag route.
This table shows the format of the inclusive multicast Ethernet tag route. All-Active Redundancy (4)
This diagram shows the format of the type 1 route, A-D route per ES. The split horizon
label is advertised as part of an extended community attached to the type 1 route. The split
horizon label is also called the ESI label. The extended community also indicates what type
of redundancy mode is used for this given ESI: single-active represented by binary 1 or
active-active represented by binary 0.
Question # 16
You enable the Multiple VLAN Registration Protocol (MVRP) to automate the creation and
management of virtual LANs. Which statement is correct in this scenario?
A. The forbidden mode does not register or declare VLANs. B. When enabled, MVRP affects all interfaces. C. Timers dictate when link state changes are propagated. D. MVRP works with RSTP and VSTP.
Answer: A
Explanation: The forbidden mode does not register or declare VLANs. You can change
the registration mode of a specific interface to forbidden. An interface in forbidden
registration mode does not participate in MVRP even if MVRP is enabled on the switch.
https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topicmap/mvrp.html
MVRP is disabled by default on the switches and, when enabled, affects only trunk
interfaces. Once you enable MVRP, all VLAN interfaces on the switch belong to MVRP (the
default normal registration mode) and those interfaces accept PDU messages and send
their own PDU messages. forbidden—The interface does not register or declare VLANS
(except statically configured VLANs).
Question # 17
You are asked to implement fault tolerant RPs in your multicast network.
Which two solutions would accomplish this behavior? (Choose two.)
A. Use BFD with statically defined RPs. B. Use MSDP with statically defined RPs. C. Use any cast PIM with statically defined RPs. D. Use IGMPv3 with statically defined RPs.
Answer: B,C
Question # 18
You must provide network connectivity to hosts that fail authentication.
In this scenario, what would be used in a network secured with 802.1X to satisfy this
requirement?
A. Configure the native-vlan-id parameter on the port. B. Use the server-reject-vlan command to specify a guest VLAN. C. Configure a secondary IP address on the port for unauthenticated hosts. D. Configure the port as a spanning tree edge port.
Answer: B
Explanation: For a device configured for 802.1X authentication, specify that when the
device receives an Extensible Authentication Protocol Over LAN (EAPoL) Access-Reject
message during the authentication process between the device and the RADIUS
authentication server, supplicants attempting to access the LAN are granted access and
moved to a specific bridge domain or VLAN. Any bridge domain, VLAN name or VLAN ID
sent by a RADIUS server as part of the EAPoL Access-Reject message is ignored.
Question # 19
You are asked to enforce user authentication using a captive portal before users access
the corporate network.
Which statement is correct in this scenario?
A. HTTPS is the default protocol for a captive portal. B. A captive portal can be bypassed using an allow list command containing a device’s IP
address. C. When enabled, a captive portal must be applied to each individual interface. D. All Web browser requests are redirected to the captive portal until authentication is
successful.
Answer: D
Explanation: You can set up captive portal authentication on your switch to redirect all
Web browser requests to a login page that requires users to input a username and
password before they are allowed access. Upon successful authentication, users are
allowed access to the network and redirected to the original page requested. Junos OS
provides a customizable template for the captive portal window that allows you to easily
design and modify the look of the captive portal login page. You can modify the design
elements of the template to change the look of your captive portal login page and to add
instructions or information to the page. You can also modify any of the design elements of
a captive portal login page. The first screen displayed before the captive login page
requires the user to read the terms and conditions of use. By clicking the Agree button, the
user can access the captive portal login
page.https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topicmap/user-authenti...
Question # 20
You are implementing the route summarization feature of OSPF.
Which two results do you achieve in this scenario? (Choose two.)
A. It helps in migrating to future multi-area OSPF network designs. B. It reduced the routing table size, enabling devices to store and process less information. C. It reduces the impact of topology changes on a device. D. It provides optimal routing in the network.
Answer: B,C
Explanation: OSPF inter-area route summarization reduces the routing information
exchanged between areas and the size of routing tables, and improves routing
performance. OSPF inter-area route summarization enables an ABR to summarize
contiguous networks into a single network and advertise the network to other areas.
Question # 21
A Layer 2 connection does not expend across data centers. The IP subnet in a Layer 2
domain is confined within a single data center.
Which EVPN route type is used to communicate prefixes between the data centers?
Which three statements are correct about EVPN route types? (Choose three.)
A. Type 3 routes carry replication information. B. Type 2 routes carry endpoint MAC address information. C. Type 2 routes carry endpoint IP address information. D. Type 5 routes carry replication information. E. Type 1 routes carry endpoint MAC address information.
Answer: A,B,C
Explanation: Cisco explains it better: The EVPN control plane advertises the following
types of information:
Route type 1 – This is an Ethernet Auto-Discovery (EAD) route type used to advertise
Ethernet segment identifier, Ethernet Tag ID, and EVPN instance information. EAD route advertisements may be sent for each EVPN instance or for each Ethernet segment.
Route type 2 – This advertises endpoint reachability information, including MAC and IP
addresses of the endpoints or VTEPs.
Route type 3 – This performs multicast router advertisement, announcing the capability and
intention to use ingress replication for specific VNIs.
Route type 4 – This is an Ethernet Segment route used to advertise the Ethernet segment
identifier, IP address length, and the originating router's IP address.
Route type 5 – This is an IP prefix route used to advertise internal IP subnet and externally
learned routes to a VXLAN network.
Question # 23
Referring to the exhibit, which two statements are correct? (Choose two.)
A. The DS-2 switch will beroot bridge for MSTI 2. B. The DS-1 switch will be root bridge for MSTI 1. C. The DS-1 switch will be root bridge for MSTI 2. D. The DS-2 switch will be root bridge for MSTI 1.
Answer: C,D
Explanation: Bridge priority is to determine which bridge becomes the designated bridge
Question # 24
In OSPF, how does a router ensure that LSAs advertised to a neighboring router are
received?
A. LSA flooding guarantees that all routers will receive them successfully. B. LSAs are sent over a TCP connection. C. LSAs are acknowledged by the neighboring router. D. LSAs are advertised with an acknowledgement bit.
Answer: C
Question # 25
You are deploying an 802.1X solution and must determine what would happen if clients are
unable to re-authenticate to the RADIUS server.
In this scenario, which configuration would provide access to the network if the supplicant
is already authenticated?
A. move B. permit C. deny D. sustain
Answer: D
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