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Juniper JN0-664 certification exam is a computer-based test that consists of 65 multiple-choice questions. Candidates have 120 minutes to complete the exam, and they must achieve a passing score of 65% or higher to earn the certification. JN0-664 Exam is administered by Pearson VUE, and it can be taken at any Pearson VUE testing center worldwide.

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The JN0-664 Exam is a comprehensive test that covers a wide range of topics related to service provider routing and switching. JN0-664 exam covers key concepts such as the Border Gateway Protocol (BGP), Intermediate System-to-Intermediate System (IS-IS), Multiprotocol Label Switching (MPLS), and Virtual Private LAN Service (VPLS). In addition, the exam also tests the candidate's knowledge of Junos OS, network automation, and network management.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q15-Q20):

NEW QUESTION # 15
Which three statements about IS-IS in a multi-area network are correct? (Choose three.)

A. External L2 PDUs are only flooded to the local area's L2 routers.
B. External L2 PDUs are flooded to all L2 routers in other areas.
C. Internal L1 PDUs are flooded to all L1 routers in other areas.
D. Internal L1 PDUs are only flooded to the local area's L1 routers.
E. Internal L1 PDUs are flooded to the local area's L2 routers.

Answer: B,D,E

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It operates in two levels, Level 1 (L1) and Level 2 (L2), and supports hierarchical routing within a multi-area network.
Let's analyze each statement to determine its correctness in the context of IS-IS multi-area networks.
1. **Statement A: Internal L1 PDUs are flooded to the local area's L2 routers.**
- This statement is correct. L1 PDUs (Protocol Data Units) are flooded within the L1 area and also to the L2 routers that are present in the same area. These L2 routers act as the boundary routers that connect the local L1 area to other L1 areas via L2.
2. **Statement B: External L2 PDUs are flooded to all L2 routers in other areas.**
- This statement is correct. L2 PDUs are flooded throughout the entire L2 backbone, which includes all L2 routers in different areas. This ensures that inter-area routing information is shared across the network.
3. **Statement C: Internal L1 PDUs are flooded to all L1 routers in other areas.**
- This statement is incorrect. Internal L1 PDUs are only flooded within the local L1 area. They do not cross L1 area boundaries; inter-area communication is handled by L2 routers.
4. **Statement D: Internal L1 PDUs are only flooded to the local area's L1 routers.**
- This statement is correct. Internal L1 PDUs are indeed only flooded within their local L1 area, and do not go beyond it.
5. **Statement E: External L2 PDUs are only flooded to the local area's L2 routers.**
- This statement is incorrect. External L2 PDUs are flooded to all L2 routers throughout the IS-IS network, not just to those in the local area. This allows L2 routers to maintain a complete map of the network's topology.
**Conclusion**:
Given the analysis, the correct answers are:
**A. Internal L1 PDUs are flooded to the local area's L2 routers.**
**B. External L2 PDUs are flooded to all L2 routers in other areas.**
**D. Internal L1 PDUs are only flooded to the local area's L1 routers.**
**References**:
- Juniper Networks Documentation on IS-IS: [IS-IS Overview](https://www.juniper.net/documentation/en_US
/junos/topics/concept/is-is-routing-overview.html)
- RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments: [RFC 1195](https://tools.ietf.
org/html/rfc1195) which details the operation of IS-IS in multi-area networks.

NEW QUESTION # 16
Which statement is true regarding BGP FlowSpec?

A. It uses a remote triggered black hole to protect a network from a denial-of-service attack.
B. It uses dynamically created routing policies to protect a network from denial-of-service attacks
C. It verifies that the source IP of the incoming packet has a resolvable route in the routing table
D. It is used to protect a network from denial-of-service attacks dynamically

Answer: B

Explanation:
BGP FlowSpec is a feature that extends the Border Gateway Protocol (BGP) to enable routers to exchange traffic flow specifications, allowing for more precise control of network traffic. The BGP FlowSpec feature enables routers to advertise and receive information about specific flows in the network, such as those originating from a particular source or destined for a particular destination. Routers can then use this information to construct traffic filters that allow or deny packets of a certain type, rate limit flows, or perform other actions1. BGP FlowSpec can also help in filtering traffic and taking action against distributed denial of service (DDoS) attacks by dropping the DDoS traffic or diverting it to an analyzer2. BGP FlowSpec rules are internally converted to equivalent Cisco Common Classification Policy Language (C3PL) representing corresponding match and action parameters2. Therefore, BGP FlowSpec uses dynamically created routing policies to protect a network from denial-of-service attacks.
References: 1: https://www.networkingsignal.com/what-is-bgp-flowspec/ 2:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-flowspe

NEW QUESTION # 17
Which origin code is preferred by BGP?

A. Null
B. Internal
C. Incomplete
D. External

Answer: C

Explanation:
Explanation
BGP uses several attributes to select the best path for a destination prefix. One of these attributes is origin, which indicates how BGP learned about a route. The origin attribute can have one of three values: IGP, EGP, or Incomplete. IGP means that the route was originated by a network or aggregate statement within BGP or by redistribution from an IGP into BGP. EGP means that the route was learned from an external BGP peer (this value is obsolete since BGP version 4). Incomplete means that the route was learned by some other means, such as redistribution from a static route into BGP. BGP prefers routes with lower origin values, so Incomplete is preferred over EGP, which is preferred over IGP.

NEW QUESTION # 18
Based on the configuration contents shown in the exhibit, which statement is true?

A. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10.
B. Joins for any group are accepted if the group count value is less than 25.
C. Joins for group 224.7.7.7 are accepted if the group count is less than 25.
D. Joins for group 224.7.7.7 are always rejected, regardless of the group count.

Answer: A

NEW QUESTION # 19
Refer to the exhibit.

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?

A. show route table bgp.l3vpn.0
B. show route table inet.0
C. show route table customer-c.inet.0
D. show route summary

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.
Final answer: ✅ 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 # 20
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