Question # 1
| 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
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
|
B. higher local preference
shortest AS path
lower origin code
lowest router ID
lowest peer address
Explanation:
The correct sequence for BGP active route selection when BGP multipath or multihop are not configured is as follows:
Higher local preference: Routes with a higher local preference are preferred.
Shortest AS path: Routes with the shortest AS path are preferred.
Lower origin code: Routes with lower origin code (IGP < EGP < Incomplete) are preferred.
Lowest router ID: Routes with the lowest router ID are preferred.
Lowest peer address: Routes with the lowest peer address are preferred.
References:
Standard BGP route selection criteria as outlined in network routing protocols.
Documentation from "Useful Juniper Commands.txt" and "Juniper Commands.pdf" which include detailed BGP operational commands and preferences.
Question # 2
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.
|
B. Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.
D. Configure the apply-vpn-export feature on the local BGP peer.
Explanation:
Step 1: Identify the problem.
Devices do not support VPN NLRI, and you must prevent these devices from receiving BGP VPN routes.
Step 2: Analyze the possible solutions.
Option A: Configure an import policy on the remote peer to reject the routes when they are received.
This approach would require configuration on the remote peer, which might not always be practical or possible.
Option B: Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.
This ensures the local BGP peer does not send the VPN routes to the remote peer, directly addressing the problem.
Option C: Configure a route reflector for the VPN NLRI.
This does not solve the issue of preventing the advertisement of VPN routes to non-supporting peers.
Option D: Configure the apply-vpn-export feature on the local BGP peer.
This feature ensures that the VPN export policies are applied, preventing the advertisement of VPN routes to peers that do not support VPN NLRI.
Step 3: Verify the configurations.
Option B and Option D directly address the requirement without needing configurations on the remote peer.
References:
Juniper BGP configuration guide on export policies.
Commands for applying export policies:
shell
Copy code
set policy-options policy-statement term from protocol bgp-vpn
set policy-options policy-statement term then reject
set protocols bgp group export
set protocols bgp apply-vpn-export
Question # 3
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.
|
C. LSAs are acknowledged by the neighboring router.
Explanation:
OSPF Protocol Basics:
OSPF (Open Shortest Path First) is a link-state routing protocol.
Routers exchange LSAs (Link-State Advertisements) to share topology information.
LSA Acknowledgment Mechanism:
OSPF uses a reliable mechanism to ensure LSAs are received.
When a router sends an LSA to a neighbor, it expects an acknowledgment (ACK).
If an ACK is not received within a certain period, the router will retransmit the LSA.
Acknowledgment Process:
LSAs are sent over OSPF's reliable transport, which ensures delivery through acknowledgments.
This mechanism helps to maintain consistent and up-to-date topology databases across routers.
References:
OSPF RFC 2328
Understanding OSPF Operations
Question # 4
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?
| A. Type 1
| B. Type 2
| C. Type 4
| D. Type 5
|
D. Type 5
Explanation:
Understanding EVPN Route Types:
EVPN routes facilitate Layer 2 and Layer 3 connectivity across data centers.
Layer 2 and Layer 3 Connectivity:
For Layer 3 connectivity across data centers, where Layer 2 does not extend, IP prefixes need to be communicated.
Type 5 Routes:
Type 5 (IP Prefix Route):
Used to distribute IP prefixes between data centers.
Ensures that Layer 3 connectivity is established without extending Layer 2 domains.
References:
Juniper EVPN Type 5 Routes
Configuring EVPN for Data Center Interconnect
Question # 5
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 multihop settings are configured on your router.
|
B. Verify that the BGP routes are active in your routing table.
C. Verify the export policies on your router.
Explanation:
To troubleshoot why ISP peers are not receiving any routes in a multihomed BGP setup, the following steps are essential:
Verify Active BGP Routes: Ensure that the BGP routes are active in the routing table. Only active routes can be advertised to BGP peers.
shell
Copy code
show route protocol bgp
Verify Export Policies:
Check the export policies configured on your router. The export policies determine which routes are advertised to BGP peers. If these policies are incorrectly configured or missing, routes will not be advertised.
shell
Copy code
show configuration policy-options policy-statement
show configuration protocols bgp group export
References:
Useful Juniper Commands.txt
Tech Ops Managed Router Juniper Install Guide
Question # 6
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 subnet
|
A. virtual links
C. 32-bit router ID
Question # 7
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.
|
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.
Explanation:
Understanding EVPN Route Types:
EVPN (Ethernet VPN) is used for providing Ethernet multipoint services over MPLS or VXLAN networks.
EVPN Route Types:
Type 1 (Ethernet Auto-Discovery Route): Used for auto-discovery of PEs and for detecting multi-homed devices.
Type 2 (MAC/IP Advertisement Route):
Carries endpoint MAC address information.
Carries endpoint IP address information.
Facilitates MAC learning and IP-to-MAC binding distribution.
Type 3 (Inclusive Multicast Route):<br><br>
Carries replication information.
Used for forwarding multicast and broadcast traffic.
Type 5 (IP Prefix Route): Carries IP prefixes for inter-subnet connectivity, but not replication information.
Verification:
Type 2 routes are crucial for distributing MAC and IP information about endpoints.
Type 3 routes are used to manage multicast traffic effectively.
References:
Juniper EVPN Configuration Guide
Understanding EVPN Route Types
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The Juniper Networks Certified Professional Enterprise
Routing and Switching (JNCIP-ENT) certification, exam code JN0-649, is an
advanced-level certification designed for networking professionals. This exam
validates your enterprise routing and switching implementations expertise,
specifically on Juniper
Networks platforms. Passing the JN0-649 exam demonstrates your capability
to configure, troubleshoot, and maintain enterprise network systems using Junos
OS.
Exam Overview
The Juniper JN0-649 exam is a 90-minute test consisting of
65 multiple-choice questions. It covers various advanced topics within the
enterprise routing and switching domain. To sit for this exam, candidates must
already hold the JNCIS-ENT (Juniper Networks Certified Specialist Enterprise
Routing and Switching) certification, ensuring they have a solid foundation of
networking knowledge and familiarity with Junos OS.
Key Details:
Exam Objectives
The JN0-649 exam tests your proficiency in advanced
networking concepts and Juniper-specific technologies. The main topics include:
- Interior
Gateway Protocols (IGPs):
- Concepts
and operations of IGPs such as OSPF and IS-IS.
- Configuration
and troubleshooting of IGPs.
- BGP:
- Understanding
BGP operations, attributes, and policy implementations.
- Configuring
and managing BGP sessions and route policies.
- Multicast:
- Multicast
routing protocols (PIM-SM, PIM-DM, and MSDP).
- Multicast
forwarding and troubleshooting.
- IPv6:
- Concepts
of IPv6 addressing and routing.
- Configuring
and troubleshooting IPv6.
- Layer
2 Switching and VLANs:
- Spanning
Tree Protocols (STP, RSTP, MSTP).
- VLAN
operations, trunking, and inter-VLAN routing.
- Network
Security:
- Implementing
security policies and firewall filters.
- Understanding
and configuring IPsec VPNs.
- Class
of Service (CoS):
- Quality
of service concepts and mechanisms.
- Configuring
and managing CoS policies.
- High
Availability:
- Configuring
and troubleshooting high availability features.
- Understanding
concepts like VRRP, GRES, and NSR.
Study Resources
To prepare effectively for the JN0-649 exam, utilizing
various study materials and resources is crucial. Here are some recommended
approaches:
Official Juniper Resources:
- Juniper
Networks Certification Program (JNCP): The official certification
page provides detailed exam objectives, Juniper JN0-649 sample questions, and other relevant
materials.
- Juniper
Learning Portal: Offers on-demand and live training courses designed
for the JN0-649 exam.
- Juniper
Technical Documentation: Comprehensive guides and manuals are
available on the Juniper website.
Additional Resources:
- RealBraindumps
Guide: RealBraindumps Provides
an extensive preparation guide, including Juniper JN0-649 study materials,
sample questions, and practice exams.
- Enterprise
Routing and Switching Certification Guide: Books and eBooks that
cover the JN0-649 syllabus in detail.
Practical Experience:
- Hands-on
Labs: Practical experience is crucial. Set up labs using Juniper
equipment or virtual labs to practice configuration and troubleshooting.
- Community
Forums: Engage with other professionals on platforms like the
Juniper Elevate Community for insights and tips.
Conclusion
A significant milestone for networking
professionals is achieving the Juniper JNCIP-ENT certification by passing the
Juniper JN0-649 exam. It validates advanced knowledge and skills in enterprise
routing and switching, enhancing career prospects and expertise in managing
complex network environments. By leveraging official resources, additional
study guides, and practical experience, candidates can effectively prepare for
and succeed in this challenging exam.
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FAQs of JN0-649 Exam
What
is the Juniper JN0-649 exam?
The
Juniper JN0-649 exam, or the Juniper Networks Certified
Professional Enterprise Routing and Switching (JNCIP-ENT) exam, is a
certification test for networking professionals with advanced knowledge and
skills in Juniper Networks technology and enterprise networking.
What
are the prerequisites for taking the JN0-649 exam?
To
take the Juniper JN0-649 exam, candidates must have already
obtained the Juniper Networks Certified Internet Specialist (JNCIS-ENT)
certification. They should also understand Juno's OS; practical experience
with Juniper devices is also recommended.
What
job roles can I pursue with a JNCIP-ENT certification?
With
a JNCIP-ENT certification, you can pursue roles such as Network Engineer,
Senior Network Administrator, Network Consultant, and Systems Engineer. These
positions typically involve designing, implementing, and managing
enterprise-level networks.
What
are the long-term benefits of obtaining the JNCIP-ENT certification?
The
long-term benefits of the JNCIP-ENT certification include improved job
security, increased career advancement opportunities, recognition as an expert
in Juniper Networks technology, and the potential for higher salaries. It also
serves as a stepping stone to more advanced certifications like the JNCIE-ENT.
Are
there any continuing education requirements for maintaining the JNCIP-ENT
certification?
Yes, Juniper
certifications are valid for three years. To maintain your JNCIP-ENT
certification, you must pass the current version of the exam or advance to a
higher-level certification within three years.
Where
should I take the JN0-649 exam?
The
JN0-649 exam can be taken at Pearson VUE testing centers worldwide. You can
schedule your exam through the Pearson
VUE website.
How
does the JNCIP-ENT certification compare to similar certifications from other
vendors?
The
JNCIP-ENT certification is comparable to other advanced networking
certifications, like Cisco's CCNP Enterprise. Each certification has its unique
focus, with JNCIP-ENT being more Juniper-centric, making it particularly
valuable for professionals working with or intending to work with Juniper Networks
products.
What
topics are covered under Protocol-Independent Routing in the JN0-649 exam?
The
Protocol-Independent Routing section covers static routes, aggregate routes,
generated routes, routing instances, and routing policy filters. Candidates
should be proficient in configuring and troubleshooting these elements.
What
are the key OSPF configurations tested in the JN0-649 exam?
Key
OSPF configurations include OSPF areas, virtual links, OSPF authentication,
route summarization, and troubleshooting OSPF issues. Candidates should be
familiar with advanced OSPF design and implementation.
What
advanced BGP concepts are part of the JN0-649 exam syllabus?
Advanced
BGP concepts tested in the exam include path selection, route reflectors, confederations,
BGP communities, and troubleshooting BGP issues. Understanding these topics is
crucial for the exam.
What
is the Class of Service (CoS) components that candidates must know for the
JN0-649 exam?
Candidates
must know about forwarding classes, classifiers, policers, schedulers, and
rewrite rules. They should understand how to implement and troubleshoot CoS to
ensure quality of service in a network.
What
is tested under Layer 2 Authentication and Access Control in the JN0-649 exam?
This
section covers 802.1X, MAC RADIUS, Captive Portal, RADIUS, and TACACS+.
Candidates should be capable of configuring and troubleshooting these
authentication and access control mechanisms in a Juniper environment.
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|
