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Quiz Newest Juniper - JN0-664 - Testking Service Provider, Professional (JNCIP-SP) Exam Questions
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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q83-Q88):
NEW QUESTION # 83
Exhibit
CE-1 and CE-2 are part of a VPLS called Customer1 No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.
Answer: D
Explanation:
VPLS is a technology that provides Layer 2 VPN services over an MPLS network. VPLS uses BGP as its control protocol to exchange VPN membership information between PE routers. The route target is a BGP extended community attribute that identifies which VPN a route belongs to. The route target must match on PE routers that participate in the same VPLS instance, otherwise they will not accept or advertise routes for that VPLS.
NEW QUESTION # 84
Which two statements are correct regarding the PIM DR in a PIM-SM domain? (Choose two.)
Answer: A,D
Explanation:
In PIM-SM (Protocol Independent Multicast - Sparse Mode), the Designated Router (DR) plays a crucial role in multicast forwarding. The DR is responsible for various tasks depending on whether it is connected to the source or the receiver. Let's analyze each statement regarding the PIM DR in a PIM-SM domain.
1. **Statement A: The source DR sends PIM register messages from the source network to the RP.**
- Correct. In PIM-SM, the DR on the source's local network is responsible for encapsulating multicast packets in PIM Register messages and sending them to the Rendezvous Point (RP). This process ensures that the RP is aware of active sources.
2. **Statement B: If the DR priorities match, the router with the lowest IP address is selected as the DR.**
- Incorrect. The correct rule is that if the DR priorities match, the router with the **highest** IP address is selected as the DR. The election process first compares priorities; if priorities are equal, the IP addresses are compared to select the DR.
3. **Statement C: The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.**
- Correct. In PIM-SM, the DR on the receiver's local network sends PIM Join messages toward the RP to join the multicast distribution tree. Similarly, it sends PIM Prune messages to leave the tree when there are no interested receivers.
4. **Statement D: By default, PIM DR election is performed on point-to-point links.**
- Incorrect. By default, PIM DR election is performed on multi-access networks (e.g., Ethernet). On point-to- point links, there is no need for a DR election as there are only two routers involved.
**Conclusion**:
The correct statements regarding the PIM DR in a PIM-SM domain are:
**A. The source DR sends PIM register messages from the source network to the RP.**
**C. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.**
**References**:
- Juniper Networks Documentation on PIM-SM: [PIM-SM Overview](https://www.juniper.net/documentation
/en_US/junos/topics/concept/pim-sparse-mode-overview.html)
- RFC 7761, Protocol Independent Multicast - Sparse Mode (PIM-SM): [RFC 7761](https://tools.ietf.org/html
/rfc7761) which details the PIM-SM protocol, including DR roles and election procedures.
NEW QUESTION # 85
By default, which statement is correct about OSPF summary LSAs?
Answer: A
Explanation:
OSPF uses different types of LSAs to describe different aspects of the network topology. Type 1 LSAs are also known as router LSAs, and they describe the links and interfaces of a router within an area. Type 3 LSAs are also known as summary LSAs, and they describe routes to networks outside an area but within the same autonomous system (AS). By default, OSPF will summarize routes from Type 1 LSAs into Type 3 LSAs when advertising them across area boundaries .
NEW QUESTION # 86
Exhibit
R1 and R8 are not receiving each other's routes
Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)
Answer: B,C,E
Explanation:
Explanation
The problem in this scenario is that R1 and R8 are not receiving each other's routes because of private AS numbers in the AS path. Private AS numbers are not globally unique and are not advertised to external BGP peers. To solve this problem, you need to do the following:
* Configure loops on routers in AS 65412 and advertise-peer-as on routers in AS 64498. This allows R5 and R6 to advertise their own AS number (65412) instead of their peer's AS number (64498) when sending updates to R7 and R8. This prevents a loop detection issue that would cause R7 and R8 to reject the routes from R5 and R62.
* Configure remove-private on advertisements from AS 64497 toward AS 64498 and from AS 64500 toward AS 64499. This removes any private AS numbers from the AS path before sending updates to external BGP peers. This allows R2 and R3 to receive the routes from R1 and R4, respectively3.
NEW QUESTION # 87
Click the Exhibit button.
After adding Customer C to your Layer 3 VPN, you must ensure that PE2 is receiving VPN routes for all customers attached to PE1, as shown in the exhibit.
Which operational command displays this information?
Answer: A
Explanation:
Understanding the Exhibit and the Problem Statement
* The diagram shows a Layer 3 VPN (L3VPN) setup where multiple customers (Customer A, B, and C ) are connected across a service provider network using PE (Provider Edge) routers.
* PE1 and PE2 exchange VPN routes for all customers using BGP/MPLS Layer 3 VPN (L3VPN) routing.
* The question asks how to verify if PE2 is receiving VPN routes for Customer C.
Evaluating the Answer Choices
# B. show route table bgp.l3vpn.0 (Correct Answer)
* Why?
* This command shows all VPN routes stored in the BGP Layer 3 VPN table (bgp.l3vpn.0).
* Since PE routers exchange VPN routes using MP-BGP, this table contains the VPN-IPv4 or VPN-IPv6 routes for all customers.
* If PE2 is receiving routes from PE1 for Customer C, they will appear in bgp.l3vpn.0.
# A. show route table inet.0 (Incorrect)
* Why?
* The inet.0 table contains global unicast routes for the service provider's network.
* VPN routes do not appear here because they are stored in VRF-specific tables.
* This command won't help verify VPN route exchange between PE1 and PE2.
# C. show route table customer-c.inet.0 (Incorrect)
* Why?
* The table customer-c.inet.0 represents the VRF routing table for Customer C on the local PE.
* It only shows locally installed routes for Customer C but does not confirm if PE2 is receiving routes from PE1.
* This command is useful to check local VPN routing but not BGP route propagation.
# D. show route summary (Incorrect)
* Why?
* This command only provides a summary of route counts per protocol (BGP, OSPF, etc.).
* It does not display specific VPN routes.
* It is useful for general troubleshooting but doesn't confirm VPN route receipt.
# show route table bgp.l3vpn.0 (Option B)
Official Juniper Documentation Reference
* Junos MPLS VPNs Configuration Guide# Juniper Documentation
"The show route table bgp.l3vpn.0 command displays all VPN-IPv4 routes learned via MP-BGP for Layer 3 VPNs."
NEW QUESTION # 88
......
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