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2025 Professional 100% Free JN0-664–100% Free Review Guide | JN0-664 Exam Tutorial

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To be eligible for the Juniper JN0-664 Certification Exam, candidates must have a valid JNCIA-Junos certification or equivalent knowledge, and have at least one year of experience working with Juniper Networks service provider routing and switching technologies. Service Provider, Professional (JNCIP-SP) certification exam covers a wide range of topics, including advanced routing and switching technologies, MPLS, VPNs, QoS, and multicast protocols.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q96-Q101):

NEW QUESTION # 96
You are asked to protect your company's customers from amplification attacks. In this scenario, what is Juniper's recommended protection method?

A. destination-based Remote Triggered Black Hole
B. unicast Reverse Path Forwarding
C. BGP FlowSpec
D. ASN prepending

Answer: A

Explanation:
Explanation
amplification attacks are a type of distributed denial-of-service (DDoS) attack that exploit the characteristics of certain protocols to amplify the traffic sent to a victim. For example, an attacker can send a small DNS query with a spoofed source IP address to a DNS server, which will reply with a much larger response to the victim. This way, the attacker can generate a large amount of traffic with minimal resources.
One of the methods to protect against amplification attacks is destination-based Remote Triggered Black Hole (RTBH) filtering. This technique allows a network operator to drop traffic destined to a specific IP address or prefix at the edge of the network, thus preventing it from reaching the victim and consuming bandwidth and resources. RTBH filtering can be implemented using BGP to propagate a special route with a next hop of
192.0.2.1 (a reserved address) to the edge routers. Any traffic matching this route will be discarded by the edge routers.

NEW QUESTION # 97
Which three mechanisms are used by Junos platforms to evaluate incoming traffic for CoS purposes? (Choose three )

A. fixed classifiers
B. behavior aggregate classifiers
C. traffic shapers
D. rewrite rules
E. multifield classifiers

Answer: A,B,E

Explanation:
Junos platforms use different mechanisms to evaluate incoming traffic for CoS purposes, such as:
Behavior aggregate classifiers: These classifiers use a single field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined or user-defined values.
Fixed classifiers: These classifiers use a fixed field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined values.
Multifield classifiers: These classifiers use multiple fields in a packet header to classify traffic into different forwarding classes and loss priorities based on user-defined values and filters.
Rewrite rules and traffic shapers are not used to evaluate incoming traffic for CoS purposes, but rather to modify or shape outgoing traffic based on CoS policies.

NEW QUESTION # 98
Refer to the exhibit.

Click the Exhibit button.
You have an EVI implemented between PE-1, PE-2, and PE-3 to allow communication between CE-1 and CE-2. CE-2 receives unicast traffic from CE-1 on both links to PE-2 and PE-3. When CE-1 sends broadcast traffic, CE-2 receives it on only one of the multihomed links.
Referring to the exhibit, which EVPN route type enables this behavior?

A. Type 3
B. Type 4
C. Type 1
D. Type 2

Answer: A

Explanation:
In the context of Ethernet VPN (EVPN) and the behavior described in the exhibit, it's essential to understand the different EVPN route types and their specific functionalities. Here, CE-2 is receiving unicast traffic on both of its multihomed links to PE-2 and PE-3, but broadcast traffic is received only on one of these links.
**Explanation of EVPN Route Types**:
1. **Type 1 (Ethernet Auto-Discovery Routes)**:
- These routes are used for auto-discovery of Ethernet segments and for advertising VLAN membership.
- They do not directly influence the behavior described in the question.
2. **Type 2 (MAC/IP Advertisement Routes)**:
- These routes are used to advertise MAC addresses and IP-to-MAC bindings within the EVPN.
- They handle unicast traffic forwarding and are crucial for populating the MAC address tables on the PE devices.
- While important, they do not explain the selective broadcast behavior.
3. **Type 3 (Inclusive Multicast Ethernet Tag Routes)**:
- These routes are used to build multicast distribution trees for delivering broadcast, unknown unicast, and multicast (BUM) traffic.
- They ensure that BUM traffic is sent only once per Ethernet segment, preventing duplicate frames from being sent to multihomed CEs.
- This aligns with the behavior described where CE-2 receives broadcast traffic on only one link to prevent duplication.
4. **Type 4 (Ethernet Segment Routes)**:
- These routes are used to advertise the presence of an Ethernet segment and are crucial for Designated Forwarder (DF) election processes in multihoming scenarios.
- While relevant to multihoming, they are not directly responsible for the selective broadcast behavior.
**Conclusion**:
The behavior described, where CE-2 receives broadcast traffic on only one of its multihomed links, is controlled by Type 3 routes. These routes are specifically designed to handle inclusive multicast and broadcast traffic efficiently in EVPN environments, ensuring that such traffic is not duplicated across multiple links to the same CE.
**Reference**:
- Juniper Networks EVPN Documentation: [EVPN Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-overview.html)
- RFC 7432, BGP MPLS-Based Ethernet VPN: [RFC 7432](https://tools.ietf.org/html/rfc7432) provides detailed descriptions of EVPN route types and their functions.
- Junos OS EVPN Configuration Guide: [Junos OS EVPN Configuration Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/evpn.html)

NEW QUESTION # 99
A packet is received on an interface configured with transmission scheduling. One of the configured queues In this scenario, which two actions will be taken by default on a Junos device? (Choose two.)

A. The exceeding queue will be considered to have positive bandwidth credit
B. The excess traffic will be discarded
C. The exceeding queue will be considered to have negative bandwidth credit.
D. The excess traffic will use bandwidth available from other queues

Answer: C,D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/cos-security-devices/topics/concept/cos-transmission-scheduling-security-overview.html When a Junos device receives a packet on an interface with transmission scheduling, traffic is placed into different queues based on Class of Service (CoS) policies. If a queue exceeds its allocated bandwidth, Junos has default behaviors for handling excess traffic.
Key Junos Behaviors for Transmission Scheduling
Queues Can Borrow Bandwidth from Other Queues ✅
If a queue has excess traffic, it can use bandwidth from underutilized queues, as long as bandwidth is available.
Reference from Juniper Documentation:
"By default, each queue can exceed the assigned bandwidth if additional bandwidth is available from other queues." Queues Have Credit-Based Tracking ✅ A queue that stays within its allocated bandwidth is considered to have positive bandwidth credit.
A queue that exceeds its allocation is considered to have negative bandwidth credit.
Reference from Juniper Documentation:
"A queue receiving traffic in excess of its bandwidth allocation is considered to have negative bandwidth credit." Evaluating the Answer Choices
✅ B. The exceeding queue will be considered to have negative bandwidth credit.
Correct, because when a queue exceeds its allocated bandwidth, Junos assigns it negative bandwidth credit.
This means the queue is in debt and must recover before it can transmit additional packets.
✅ C. The excess traffic will use bandwidth available from other queues.
Correct, because Junos allows excess traffic to borrow bandwidth from underutilized queues by default.
If a forwarding class does not use its allocated bandwidth, other queues can borrow the unused bandwidth.
Why the Other Answers Are Incorrect?
❌ A. The excess traffic will be discarded.
Incorrect, because Junos does not immediately discard excess traffic unless the queue cannot borrow bandwidth.
By default, Junos allows bandwidth sharing, and only if no bandwidth is available does it drop packets.
❌ D. The exceeding queue will be considered to have positive bandwidth credit.
Incorrect, because when a queue exceeds its assigned bandwidth, it gets negative bandwidth credit, not positive credit.
Verified Juniper Official Reference
Junos CoS Transmission Scheduling Overview
"By default, each queue can exceed the assigned bandwidth if additional bandwidth is available from other queues."
"A queue receiving traffic in excess of its bandwidth allocation is considered to have negative bandwidth credit."

NEW QUESTION # 100
Which statement is correct about IS-IS when it performs the Dijkstra algorithm?

A. When a new neighbor ID in the tree database matches a router ID in the LSDthe neighbor ID is moved to the candidate database.
B. The local router moves its own local tuples into the candidate database.
C. The algorithm will stop processing once the tree database is empty.
D. Tuples with the lowest cost are moved from the tree database to the LSDB.

Answer: C

NEW QUESTION # 101
......

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