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[General] New JN0-664 Dumps Book - JN0-664 Study Material

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【General】 New JN0-664 Dumps Book - JN0-664 Study Material

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q64-Q69):NEW QUESTION # 64
Which two statements about IS-IS are correct? (Choose two.)
  • A. CSNPs are flooded periodically.
  • B. PSNPs contain only descriptions of LSPs.
  • C. PSNPs are flooded periodically.
  • D. CSNPs contain only descriptions of LSPs.
Answer: A,B
Explanation:
Option A (Correct):
Complete Sequence Number PDUs (CSNPs) are periodically flooded by the Designated Intermediate System (DIS) on multi-access networks (e.g., Ethernet).
This ensures all routers on the segment synchronize their Link-State Databases (LSDBs).
Reference:
Option C (Correct):
Partial Sequence Number PDUs (PSNPs) contain only the headers (descriptions) of LSPs (e.g., LSP ID, sequence number, checksum).
PSNPs are used to:
Request missing LSPs (when a router detects discrepancies via CSNPs).
Acknowledge LSP receipt (in point-to-point networks).
They do not include the full LSP data.
Why Other Options Are Incorrect:
Option B: Incorrect. PSNPs are not flooded periodically-they are sent on-demand for specific LSP synchronization.
Option D: Incorrect. While CSNPs do contain LSP descriptions (headers), the term "only" is misleading. CSNPs summarize all LSPs in the LSDB, but they are not limited to "only" descriptions-they serve as a complete database overview.
Key Takeaways:
CSNPs are periodic, broadcast by the DIS, and ensure LSDB consistency.
PSNPs are triggered, contain specific LSP headers, and handle requests/acknowledgments.
IS-IS uses CSNPs and PSNPs to maintain efficient LSDB synchronization without flooding full LSPs unnecessarily.
For further details, refer to Juniper's official IS-IS documentation:
Juniper IS-IS Configuration Guide.

NEW QUESTION # 65
Exhibit

Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly What should you do to solve the problem?
  • A. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP
  • B. Configure the explicit-null statement on PE-1.
  • C. Configure the explicit-null statement on PE-2
  • D. Set a static CoS value for the PE-1_to_PE-2 LSP
Answer: C
Explanation:
Understanding the Problem in MPLS CoS Classification
How EXP Bits Are Used for CoS in MPLS
Traffic is sent from VPN-A Site-1 → CE-1 → PE-1 → P-1 → PE-2 → CE-2.
The MPLS LSP (Label Switched Path) from PE-1 to PE-2 is expected to carry MPLS EXP bits, which are used for Class of Service (CoS) classification.
PE-2 should classify traffic based on EXP bits received in the MPLS label.
What Happens with PHP (Penultimate Hop Popping)?
By default, the penultimate router (P-1) pops the top MPLS label before sending the packet to PE-2.
Since the EXP bits are in the top MPLS label, they get removed along with the label.
This means that PE-2 no longer sees the correct EXP bits, leading to incorrect traffic classification.
Solution: Configure Explicit-Null on PE-2
Explicit Null (explicit-null) must be configured on PE-2 to ensure that P-1 does NOT remove the MPLS label.
Instead of removing the label, P-1 will send a label of 0 (for IPv4) or 2 (for IPv6) to PE-2.
This preserves the MPLS EXP bits, allowing PE-2 to classify the traffic correctly.
Evaluating the Answer Choices Again
✅ B. Configure the explicit-null statement on PE-2.
Correct, because:
PE-2 is the egress LSR, where Ultimate Hop Popping (UHP) must be enabled.
Configuring explicit-null ensures that P-1 does not remove the label, preserving the EXP bits for CoS classification at PE-2.
Configuration on PE-2:
set protocols mpls explicit-null
Juniper Documentation Reference:
"Explicit-null must be configured on the egress LSR to prevent PHP from removing the top MPLS label, thereby preserving the EXP bits."
❌ A. Configure the explicit-null statement on PE-1.
Incorrect, because:
Explicit-null must be configured on the egress LSR (PE-2), not the ingress LSR (PE-1).
PE-1 only labels the traffic but does not control PHP behavior on P-1.
❌ C. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP.
Incorrect, because:
VPN prefix mapping is used for mapping VPN routes to LSPs but does not solve the EXP bit issue.
The problem here is label removal (PHP), not route mapping.
❌ D. Set a static CoS value for the PE-1_to-PE-2 LSP.
Incorrect, because:
This does not preserve the original EXP bits, it only applies a static CoS value.
It's a workaround, not a fix.
Final answer: ✅ B. Configure the explicit-null statement on PE-2.
Key Takeaways
Penultimate Hop Popping (PHP) removes the outer MPLS label at P-1, which also removes the EXP bits used for CoS classification.
To keep EXP bits intact, configure explicit-null on the egress PE (PE-2).
This forces P-1 to send a label (0 for IPv4, 2 for IPv6) to PE-2, preserving the EXP bits for CoS classification.
Official Juniper Documentation Reference
Juniper MPLS CoS and PHP Behavior Guide
"To retain CoS EXP bits at the egress LSR, configure explicit-null on the egress PE. This prevents PHP from stripping the MPLS label before reaching the final PE router."

NEW QUESTION # 66
Exhibit

A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working.
Which three configuration changes will create a summary route? (Choose three.)
  • A. set policy-options policy-statement leak-v6 term DC-routes from route-filter 2001:db9:a:faOO::/61 exact
  • B. delete policy-options policy-statement leak-v6 term DC-routes from route-filter 2001: db9 :a: fa00 : :/6l longer
  • C. set protocols isis import summary-v6
  • D. set policy-options policy-statement leak-v6 term DC-routes then reject
  • E. delete protocols isis export summary-v6
Answer: A,B,E
Explanation:
Explanation
To create a summary route for IS-IS, you need to configure a policy statement that matches the prefixes to be summarized and sets the next-hop to discard. You also need to configure a summary-address statement under the IS-IS protocol hierarchy that references the policy statement. In this case, the policy statement leak-v6 is trying to match the prefix 2001:db9:a:fa00::/61 exactly, but this prefix is not advertised by any router in the network. Therefore, no summary route is created. To fix this, you need to delete the longer keyword from the route-filter term and change the prefix length to /61 exact. This will match any prefix that falls within the /61 range. You also need to delete the export statement under protocols isis, because this will export all routes that match the policy statement to other IS-IS routers, which is not desired for a summary route.

NEW QUESTION # 67
Which two statements are correct about VPLS tunnels? (Choose two.)
  • A. BGP-signaled VPLS tunnels require manual provisioning of sites.
  • B. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
  • C. LDP-signaled VPLS tunnels only support control bit 0.
  • D. LDP-signaled VPLS tunnels use auto-discovery to provision sites.
Answer: B,C

NEW QUESTION # 68
Exhibit

Referring to the exhibit, CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts Which two statements are correct in this scenario? (Choose two.)
  • A. You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.
  • B. You must configure a static route in the main routing instance for the 10 1 2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop
  • C. You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
  • D. You must configure a RIB group on PE-1 to leak the 10 1 2.0/24 prefix from the VPN-A.inet.0 table to the inet.0 table.
Answer: A,C

NEW QUESTION # 69
......
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