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Juniper JN0-664 Exam focuses on different areas such as Juniper Networks’ technology, service provider routing and switching, and platform configuration and troubleshooting. It also covers the topics of Border Gateway Protocol (BGP), Intermediate System to Intermediate System (IS-IS), Open Shortest Path First (OSPF), and Multiprotocol Label Switching (MPLS).

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q17-Q22):

NEW QUESTION # 17
Which two statements are correct regarding the PIM DR in a PIM-SM domain? (Choose two.)

A. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.
B. By default, PIM DR election is performed on point-to-point links.
C. If the DR priorities match, the router with the lowest IP address is selected as the DR.
D. The source DR sends PIM register messages from the source network to the RP.

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.**
**Reference**:
- 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 # 18
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)

A. Route reflectors do not change any existing BGP attributes by default when advertising routes.
B. Clients add their originator ID when advertising routes to their route reflector
C. A BGP peer does not require any configuration changes to become a route reflector client.
D. Route reflectors add their cluster ID to the AS path when readvertising client routes.

Answer: A,C

Explanation:
Explanation
Route reflection is a BGP feature that allows a router to reflect routes learned from one IBGP peer to another IBGP peer, without requiring a full-mesh IBGP topology. Route reflectors do not change any existing BGP attributes by default when advertising routes, unless explicitly configured to do so. A BGP peer does not require any configuration changes to become a route reflector client, only the route reflector needs to be configured with the client parameter under [edit protocols bgp group group-name neighbor neighbor-address] hierarchy level.

NEW QUESTION # 19
You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP. You have already configured mpls ipv6-tunneling on your PE routers.

Which two statements are correct about the BGP configuration in this scenario? (Choose two.)

A. You must configure family inet6 unicast between PE and CE routers.
B. You must configure family inet6 add-path between PE and CE routers.
C. You must configure family inet6 labeled-unicast between PE routers.
D. You must configure family inet6 unicast between PE routers.

Answer: A,C

NEW QUESTION # 20
Referring to the exhibit, which two statements are true? (Choose two.)

A. This route is learned through EBGP.
B. The device advertising this route into EVPN is 192.168.101.5.
C. The devices advertising this route into EVPN are 10.0.2.12 and 10.0.2.22.
D. This is an EVPN Type-2 route.

Answer: B,D

NEW QUESTION # 21
Exhibit

You have MAC addresses moving in your EVPN environment
Referring to the exhibit, which two statements are correct about the sequence number? (Choose two)

A. It resolves conflicting MAC address ownership claims.
B. It helps the local PE to identify the latest advertisement.
C. It is advertised using a Type 2 message
D. It identifies MAC addresses that should be discarded.

Answer: B,C

Explanation:
In an EVPN (Ethernet Virtual Private Network) environment, MAC address mobility is a critical feature that allows devices to move across different locations while ensuring the network consistently tracks their MAC addresses. Let's break down the components in the exhibit and analyze the correct statements.
Understanding MAC Mobility and Sequence Numbers in EVPN
In EVPN, MAC mobility is managed through sequence numbers that are included in Type 2 MAC/IP advertisements.
* The sequence number tracks MAC movement events and is used to determine the most recent update when a MAC address appears on different PEs (Provider Edge devices).
* When a MAC address moves between locations, the EVPN PEs increment the sequence number and advertise it to resolve conflicts and determine which PE has the most up-to-date information.
Now, Let's Review the Options:
# C. It helps the local PE to identify the latest advertisement.
* Correct:The sequence number plays a key role in resolving MAC address conflicts. If multiple PEs advertise the same MAC address, the PE compares the sequence numbers to determine which update is the latest.
* A higher sequence number indicates a more recent MAC update.
# D. It is advertised using a Type 2 message.
* Correct:EVPN MAC/IP advertisements use BGP EVPN Type 2 messages to carry MAC addresses, IP addresses (optional), and their associated sequence numbers.
* Type 2 advertisements are used to track MAC mobility and IP reachability information in the EVPN.
Why the Other Options Are Incorrect:
# A. It identifies MAC addresses that should be discarded.
* Incorrect:The sequence number doesn't identify MAC addresses that need to be discarded.Instead, it resolves conflicts by determining the most recent MAC address advertisement based on the highest sequence number.
# B. It resolves conflicting MAC address ownership claims.
* Partially true, but misleading:While it's true that sequence numbers are used in conflict resolution, the sequence number itself doesn't directly resolve ownership claims. It only helps determine which advertisement is more recent. The actual conflict resolution happens through the comparison of the advertisements and sequence numbers.
# C. It helps the local PE to identify the latest advertisement.
# D. It is advertised using a Type 2 message.
Reference from Juniper Documentation:
* Juniper EVPN Configuration Guide:
"In EVPN MAC/IP advertisements, sequence numbers track the mobility of MAC addresses and are used to resolve conflicts when the same MAC address is advertised by multiple PEs. The PE with the higher sequence number has the most recent information."
# Juniper BGP EVPN Mobility Documentation

NEW QUESTION # 22
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