Updated Oct-2024 Test Engine to Practice Test for JN0-649 Exam Questions and Answers!
Enterprise Routing and Switching, Professional (JNCIP-ENT) Certification Sample Questions and Practice Exam
The JNCIP-ENT is a professional-level certification exam that is aimed at individuals who have already earned the Juniper Networks Certified Specialist Enterprise Routing and Switching (JNCIS-ENT) certification or have equivalent experience. Enterprise Routing and Switching, Professional (JNCIP-ENT) certification exam is ideal for network engineers, technicians, and administrators who work with Juniper Networks routers and switches in a small to medium-sized enterprise network environment.
Juniper JN0-649 (JNCIP-ENT) exam consists of multiple-choice questions, and the candidate has three hours to complete the exam. The candidate must score at least 65% to pass the exam. JN0-649 exam is proctored, and the candidate must register and pay the exam fee through the Pearson VUE website.
Juniper JN0-649 exam is an excellent opportunity for IT professionals looking to advance their career in enterprise routing and switching. Passing JN0-649 exam and earning the JNCIP-ENT certification validates a candidate's skills and expertise in Juniper Networks' enterprise routing and switching platforms, making them a valuable asset to any organization. With the exam available in multiple languages and testing centers worldwide, candidates can take the exam at their convenience and demonstrate their knowledge globally.
NEW QUESTION # 114
Which two multicast listener registration protocols are supported in the Junos operating system?
(Choose two.)
- A. PIM
- B. MLD
- C. IGMP
- D. DVMRP
Answer: B,C
Explanation:
Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) are the Multicast Group Membership Discovery (MGMD) protocols.
NEW QUESTION # 115
You must ensure that all routes in the 10.0.0/8 address range are not advertised outside of your AS. Which well-known BGP community should be assigned to these addresses to accomplish this task?
- A. no-peer
- B. no-export
- C. no-advertise
- D. internet
Answer: B
Explanation:
For specifying the BGP community attribute only, you also can specify community-ids as one of the following well-known community names defined in RFC 1997:
no-advertise - Routes containing this community name are not advertised to other BGP peers.
no-export - Routes containing this community name are not advertised outside a BGP confederation boundary.
no-export-subconfed - Routes containing this community are advertised to IBGP peers with the same AS number, but not to members of other confederations.
llgr-stale - Adds a community to a long-lived stale route when it is readvertised.
no-llgr - Marks routes which a BGP speaker does not want to be retained by LLGR. The Notification message feature does not have any associated configuration parameters.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/community- edit-routing-options.html
NEW QUESTION # 116
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 router is not an ABR.
- C. The router is an ABR.
- D. The ge-1/1/0 interface is configured as secondary for Area 0.
Answer: A,C
Explanation:
"Secondary interfaces are supported for LAN interfaces (the primary interface can be a LAN interface, but any secondary interfaces are treated as point-to-point unnumbered links over the LAN). In this scenario, you must ensure that there are only two routing devices on the LAN or that there are only two routing devices on the LAN that have secondary interfaces configured for a specific OSPF area."
[https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/configuring-ospf-areas.html
NEW QUESTION # 117
You want to provide Layer 2 connectivity between campus sites using Ethernet switches through a metro Ethernet service provider who is using Q-in-Q tagging on their network.
Referring to the exhibit, what are two design considerations in this environment? (Choose two.)
- A. Each campus switch shown must have a C-Tag 300 configured.
- B. L2PT is required on the SP network to support the spanning tree protocol.
- C. VXLAN could be implemented on your network across this service provider network.
- D. Each campus switch shown must have S-Tag 300 configured.
Answer: B,C
Explanation:
* Understanding the Problem:
* The requirement is to provide Layer 2 connectivity between campus sites using Ethernet switches through a metro Ethernet service provider who is using Q-in-Q tagging.
* Design Considerations:
* VXLAN Implementation:
* VXLAN (Virtual Extensible LAN) can be used to extend Layer 2 networks over Layer 3 networks. It is often used to provide scalability and flexibility in modern data center networks. In this case, VXLAN could be used to encapsulate Layer 2 frames within UDP packets, allowing them to be transported over the service provider's network.
* S-Tag Configuration:
* Q-in-Q tagging, also known as 802.1ad, involves an outer tag (S-Tag) and an inner tag (C-Tag). The service provider network uses the S-Tag to identify and segregate customer traffic. Therefore, each campus switch must have the correct S-Tag (300 in this case) configured to ensure the service provider can correctly handle and route the traffic.
References:
* Juniper Networks: Understanding VXLAN
* Configuring Q-in-Q Tagging
NEW QUESTION # 118
BGP multipath or multihop 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
lowest router ID
lowest peer address
lower origin code
shortest AS path - C. higher local preference
shortest AS path
lowest router ID
lowest peer address
lower origin code - D. higher local preference
shortest AS path
lower origin code
lowest router ID
lowest peer address
Answer: D
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
http://www.next-itsolutions.co.uk/wp-content/uploads/2015/09/CCIE-BGP-Best-Path- Selection1.png
https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing- protocols-address-representation.html
NEW QUESTION # 119
Packets enter a Juniper device and are classified as best effort. During the processing of the packet, the classification of the packets is changed to expedited forwarding by a multi-field classifier. The device is using the default CoS policies Which statement is true in this scenario?
- A. The packet is forwarded according to the new packet classification, and the DSCP bits do not change.
- B. The packet is forwarded according to the original packet classification, and the DSCP bits do not change.
- C. The packet is forwarded according to the new packet classification, and the DSCP bits are rewritten to the new class.
- D. The packet is forwarded according to the original packet classification, and the DSCP bits are rewritten to the new class.
Answer: A
NEW QUESTION # 120
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. All Web browser requests are redirected to the captive portal until authentication is successful.
- B. HTTPS is the default protocol for a captive portal.
- C. When enabled, a captive portal must be applied to each individual interface.
- D. A captive portal can be bypassed using an allowlist command containing a device's IP address.
Answer: A
NEW QUESTION # 121
Click the Exhibit.
Switch 4 is rebooted as shown in the exhibit.
Which statement is correct in this scenario?
- A. CIST generates notification events.
- B. CIST is reconverged.
- C. MSTI-1 is reconverged.
- D. MSTI-2 is reconverged.
Answer: C
NEW QUESTION # 122
You are implementing the route summarization feature of OSPF.
Which two results do you achieve in this scenario? (Choose two.)
- A. It reduced the routing table size, enabling devices to store and process less information.
- B. It reduces the impact of topology changes on a device.
- C. It provides optimal routing in the network.
- D. It helps in migrating to future multi-area OSPF network designs.
Answer: A,B
Explanation:
OSPF Route Summarization Benefits:
* Reduces Routing Table Size: By summarizing routes, multiple specific routes are combined into a single route. This reduces the number of entries in the routing table, making it more efficient and easier for the devices to process. This is critical in large networks to maintain performance and manageability.
* Reduces Impact of Topology Changes: When a topology change occurs in one of the summarized routes, it does not need to propagate throughout the entire network. Only the summary route may need to be updated, which minimizes the impact and limits the scope of updates needed.
Implementation in OSPF:
* Configuration Example:
shell
Copy code
set protocols ospf area 0.0.0.0 range 10.1.0.0/16
* This command summarizes the routes in area 0.0.0.0 to a single route of 10.1.0.0/16.
References:
* The documents provided, such as "network-mgmt.pdf" and other relevant configuration guides, emphasize these benefits as fundamental to efficient OSPF deployment.
NEW QUESTION # 123
Which three MSTP parameters must match on all switches in the same MST region? (Choose three.)
- A. bridge priority
- B. configuration name
- C. revision number
- D. forwarding delay
- E. MSTI-to-VLAN mapping
Answer: B,C,E
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-configuring-mstp.html
NEW QUESTION # 124
You have configured MSTP in your Layer 2 network.
You are having problems with it establishing correctly.
Referring to the exhibit, what is causing the problem?
- A. The MSTI-to-VLAN mapping does not match
- B. The revision number is the same on both devices
- C. The region name is not correct
- D. You must assign a context ID number other than zero
Answer: A
NEW QUESTION # 125
Which address range is used for source-specific multicast?
- A. 232.0.0.0/8
- B. 233.0.0.0/8
- C. 224.2.0.0/16
- D. 239.0.0.0/8
Answer: A
Explanation:
PIM SSM introduces new terms for many of the concepts in PIM sparse mode. PIM SSM can technically be used in the entire 224/4 multicast address range, although PIM SSM operation is guaranteed only in the 232/8 range (232.0.0/24 is reserved). The new SSM terms are appropriate for Internet video applications and are summarized in Table 1.
https://www.juniper.net/documentation/us/en/software/junos/multicast/topics/concept/multicast- pim-ssm.html
NEW QUESTION # 126
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. MVRP works with RSTP and VSTP.
- B. Timers dictate when link state changes are propagated.
- C. When enabled, MVRP affects all interfaces.
- D. The forbidden mode does not register or declare VLANs.
Answer: D
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/topic-map/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).
NEW QUESTION # 127
You have configured 802.1X single supplicant mode on the access switch. The VoIP phone does not support 802.1X authentication.
Referring to the exhibit, which statement is true?
- A. The VoIP phone will not be able to communicate over the network.
- B. MAC bypass must be configured for the VoIP phone for this solution to work.
- C. Authentication must be changed to multiple supplicant mode for this solution to work.
- D. The VoIP phone will be able to communicate over the network after the workstation authenticates.
Answer: D
NEW QUESTION # 128
Referring to the exhibit, you have placed the cos multifield classifier on all edge interfaces and configured the relevant CoS parameters.
In this scenario, which two statements are correct? (Choose two.)
- A. SSH traffic using the default port will be placed in the best-effort forwarding class and accepted.
- B. UDP traffic using the 16000 port will be placed in the best-effort forwarding class and accepted.
- C. UDP traffic using the 16000 port will be placed in the voice forwarding class and accepted.
- D. SSH traffic using the default port will be placed in the af forwarding class and accepted.
Answer: C,D
NEW QUESTION # 129
You are asked to deploy 802.1X on your EX Series switches. You need to ensure authenticated devices continue to have access to the network even if the authentication server fails.
Which action meets this configuration objective?
- A. Set the reauthentication interval to a value of 0.
- B. Set the reauthentication interval to a value of disable.
- C. Configure the static MAC bypass for the authentication server.
- D. Configure the server fail fallback with a value of sustain.
Answer: D
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/concept/802-1x- pnac-divert-authentication-understanding-mx-series.html
NEW QUESTION # 130
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-secure supplicant mode
- B. single supplicant mode
- C. multiple supplicant mode
- D. MAC authentication mode
Answer: A
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
NEW QUESTION # 131
You are asked to configure an 802.1X solution that supports dynamic VLAN assignment. In this scenario, which two modes support using vendor-specific attributes (VSAs)? (Choose two.)
- A. static MAC bypass mode
- B. single-secure supplicant mode
- C. single supplicant mode
- D. multiple supplicant mode
Answer: B,D
NEW QUESTION # 132
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. All Web browser requests are redirected to the captive portal until authentication is successful.
- B. HTTPS is the default protocol for a captive portal.
- C. When enabled, a captive portal must be applied to each individual interface.
- D. A captive portal can be bypassed using an allowlist command containing a device's IP address.
Answer: A
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/topic-map/user- authentication-captive-portal.html
NEW QUESTION # 133
Your network has an unmanaged switch between the hosts and your EX Series switch. After the traffic enters the EX Series switch, each host must be on a separate VLAN.
How would you accomplish this task?
- A. Configure interface ge-0/0/3 to a mode trunk to assign the VLANs.
- B. Configure VSTP on interface ge-0/0/1 to assign the VLANs.
- C. Configure an output firewall filter on interface ge-0/0/1 to match the destination MAC or IP address of the hosts to assign the VLANs.
- D. Configure an input firewall filter on interface ge-0/0/3 to match the source MAC or IP address of the hosts to assign the VLANs.
Answer: D
Explanation:
To ensure that each host is placed on a separate VLAN when using an unmanaged switch between the hosts and the EX Series switch:
* Configure an input firewall filter on interface ge-0/0/3 to match the source MAC or IP address of the hosts to assign the VLANs:
* By configuring an input firewall filter, you can match the source MAC or IP address of incoming traffic and assign the appropriate VLAN based on these criteria.
* This method ensures that even though the switch between hosts and EX Series is unmanaged, VLAN assignments are still properly enforced at the EX Series switch.
Configuration Example:
set firewall family ethernet-switching filter VLAN-assignment term VLAN100 from source-mac-address xx:xx:xx:xx:xx:xx set firewall family ethernet-switching filter VLAN-assignment term VLAN100 then vlan-assignment vlan 100 set firewall family ethernet-switching filter VLAN-assignment term VLAN200 from source-mac-address yy:yy:yy:yy:yy:yy set firewall family ethernet-switching filter VLAN-assignment term VLAN200 then vlan-assignment vlan 200 set firewall family ethernet-switching filter VLAN-assignment term VLAN300 from source-mac-address zz:zz:zz:zz:zz:zz set firewall family ethernet-switching filter VLAN-assignment term VLAN300 then vlan-assignment vlan 300 set interfaces ge-0/0/3 unit 0 family ethernet-switching filter input VLAN-assignment References:
* The command references from "Useful Juniper Commands.txt" and network configuration guides provide details on firewall filters and VLAN assignments.
NEW QUESTION # 134
You are currently using VLAN IDs 2 through 300 within your Layer 2 domain and you need to configure VSTP to prevent loops You must ensure that all VL ANs are loop free.
In this scenario, which statement is correct?
- A. You must ensure that the bridge priority is set to the lowest value on all switches in the Layer 2 domain.
- B. You must ensure that the VLANs are balanced between two different root bridges.
- C. You must enable RSTP to account for all VLANs.
- D. You must enable all VLANs, 2 through 300, under the VSTP configuration
Answer: D
NEW QUESTION # 135
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