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Juniper JN0-649 Exam Sample Questions

Question # 1

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

Answer

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

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Question # 2

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. 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

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Question # 3

You are deploying IP phones in your enterprise network that must receive their power through their Ethernet connection. You are using your EX Series switch's PoE ports that support IEEE 802.3af. In this scenario, what is the maximum amount of power allocated to each interface?

A. 10.2 W

B. 15.4 W

C. 30 W

D. 50 W

Answer

B. 15.4 W

Explanation:

Understanding IEEE 802.3af Standard:

IEEE 802.3af, also known as PoE (Power over Ethernet), specifies the standard for delivering power over Ethernet cables.

This standard allows devices like IP phones to receive power along with data over the same cable. Maximum Power Allocation:

According to the IEEE 802.3af standard, the maximum power that can be delivered to a powered device is 15.4 watts.

This power is delivered over Category 5 (Cat 5) cables or higher.

EX Series Switches Compliance:

Juniper EX Series switches with PoE support adhere to the IEEE 802.3af standard.

Thus, each PoE port on these switches can allocate up to 15.4 watts to connected devices.

References:

IEEE 802.3af standard specifications

Juniper EX Series switch documentation

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Question # 4

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

Answer

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.

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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.

Answer

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

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