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Juniper JN0-364 Exam Syllabus Topics:

Section	Objectives
OSPF and IS-IS Routing Protocols	- OSPF configuration and troubleshooting 1. Areas and LSAs 2. Adjacency and neighbor states - IS-IS operation in service provider networks 1. LSP and SPF calculation 2. Levels and routing hierarchy
MPLS and Service Provider Technologies	- VPN services 1. Layer 3 VPN concepts 2. Layer 2 VPN overview - MPLS fundamentals 1. LDP operations 2. Label switching and forwarding
Troubleshooting and Operations	- Performance and monitoring 1. Traffic analysis basics 2. System logging and alarms - Network troubleshooting methodology 1. Protocol verification tools 2. Junos operational commands
BGP and Routing Policy	- Routing policy control 1. Import/export policies 2. Route filtering and manipulation - BGP fundamentals 1. eBGP and iBGP operations 2. Attributes and path selection
Service Provider Architecture & Junos Fundamentals	- Service provider network design basics 1. Core, edge, and access architecture 2. Scalability considerations - Junos OS routing fundamentals 1. Junos CLI and configuration hierarchy 2. Routing table and forwarding concepts

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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q55-Q60):

NEW QUESTION # 55
Which OSPF database packet determines which router is in charge of the database synchronization and the transferring of LSA headers between the two systems?

A. link-state request
B. database description
C. hello
D. link-state update

Answer: B

Explanation:
The Database Description (DD) packets serve two main purposes:
1. determinining which router is in charge of the database synchronization
2. tansferring the LSA headers between the two systems
The Database Description (DBD) OSPF packet is used during the adjacency formation process to describe the contents of the topological database between routers. The routers exchange DBD packets to determine the master and slave relationship, which dictates the router in charge of the database synchronization.

NEW QUESTION # 56
You are bringing a new network online with three MX Series devices enabled for STP. No root bridge priority has been configured. Which statement is true in this scenario?

A. The device with the lowest MAC address will be elected as the root bridge.
B. The device with the highest numerical lo0 IP address will be elected as The bridge.
C. The device with the lowest numerical lo0 IP address will be elected as the root bridge.
D. The device with the highest MAC address will be elected as the root bridge.

Answer: A

Explanation:
The root bridge in a spanning-tree network is the bridge with the smallest or the lowest bridge ID.
In the absence of a manually configured priority, the Spanning Tree Protocol (STP) elects the root bridge based on the lowest bridge ID, which is a combination of the priority and the MAC address.
The device with the lowest MAC address will have the lowest bridge ID and thus be elected as the root bridge.

NEW QUESTION # 57
You are the administrator for two Junos routers called R1 and R2. These two routers are directly connected to each other. These two routers run IS-IS and BFD. R1 is configured to send BFD packets every 300 milliseconds. R2 is configured to send BFD packets every 400 milliseconds.
In this situation, what is the expected outcome?

A. BFD will fail due to the mismatched timers.
B. Each router will negotiate to send BFD packets at the slowest of the two rates.
C. Each router will negotiate to send BFD packets at the fastest of the two rates.
D. Each router will send BFD packets at the rate that has been locally configured.

Answer: B

Explanation:
With BFD, each side advertises its desired transmit interval, but the session uses an effective transmit/receive behavior that must be acceptable to both ends. The receiving side controls how fast it is willing to be polled by advertising its required minimum receive interval, which results in the effective rate converging to the slower (larger interval) value so that neither router is forced to receive BFD control packets faster than it supports.

NEW QUESTION # 58
What are three default BGP advertisement rules? (Choose three.)

A. EBGP peers advertise routes learned from IBGP or EBGP peers to other EBGP peers.
B. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
C. IBGP peers do not advertise routes received from EBGP peers to other IBGP peers.
D. IBGP peers advertise routes received from IBGP peers to other IBGP peers.
E. IBGP peers do not advertise routes received from IBGP peers to other IBGP peers.

Answer: A,B,E

Explanation:
TheBorder Gateway Protocol (BGP)operates based on a strict set of advertisement rules designed to prevent routing loops while ensuring global reachability. These rules differ significantly depending on whether the relationship isExternal BGP (EBGP)orInternal BGP (IBGP).
1. EBGP Advertisement (Option A):In a standard EBGP scenario, a router acts as an exit/entry point for an Autonomous System. When an EBGP speaker receives a valid route from any peer (Internal or External), it will, by default, advertise that route to all of its other EBGP peers. This is the primary mechanism that allows prefixes to propagate across the global internet from one AS to another.
2. IBGP Split Horizon (Option D):
The most critical rule within an AS is theIBGP Split Horizonrule. To prevent loops within an AS, BGP dictates that a route learned from an IBGP peermust notbe advertised to any other IBGP peer. This is why BGP requires a "full mesh" of IBGP sessions or the use ofRoute Reflectorsto ensure all internal routers learn all routes. Without this rule, a route could circulate infinitely within the AS because IBGP does not update the AS_PATH attribute.
3. EBGP to IBGP Propagation (Option B):
When a router learns a route from an EBGP peer, it is permitted to advertise that route to all of its IBGP peers.
This ensures that everyone inside the network knows how to reach external destinations. However, it is important to remember that in Junos OS, theBGP Next Hopis not modified by default when sending routes to IBGP peers, often requiring a "next-hop-self" policy to ensure internal reachability.
Options C and E are incorrect because they directly contradict these fundamental BGP loop-prevention and propagation mechanisms.

NEW QUESTION # 59
A BGP router receives two routes to the same prefix. One route has a higher local preference, while the other has a shorter AS path.
In this scenario, which route would be selected?

A. The route with the higher local preference.
B. The route with the shorter AS path.
C. The route with the lower origin code.
D. The route with the lowest MED value.

Answer: A

Explanation:
Local preference is evaluated before the AS path length in the BGP best-path selection process.
A route with a higher local preference is therefore preferred even if another route has a shorter AS path.

NEW QUESTION # 60
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