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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Exam is a certification exam offered by Juniper Networks, a leading provider of network solutions. JN0-664 exam is designed for professionals who are responsible for designing, configuring, and managing Juniper Networks service provider routing and switching platforms. The JN0-664 Exam is intended for individuals who have a solid understanding of networking technologies and protocols and have experience working with Juniper Networks products.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q30-Q35):

NEW QUESTION # 30
Exhibit

A network is using IS-IS for routing.
In this scenario, why are there two TLVs shown in the exhibit?

A. There are both narrow and wide metric devices in the topology
B. The interface specified a metric of 100 for L2.
C. Both IPv4 and IPv6 are being used in the topology
D. Wide metrics have specifically been requested

Answer: A

Explanation:
TLVs are tuples of (Type, Length, Value) that can be advertised in IS-IS packets. TLVs can carry different kinds of information in the Link State Packets (LSPs). IS-IS supports both narrow and wide metrics for link costs. Narrow metrics use a single octet to encode the link cost, while wide metrics use three octets. Narrow metrics have a maximum value of 63, while wide metrics have a maximum value of 16777215. If there are both narrow and wide metric devices in the topology, IS-IS will advertise two TLVs for each link: one with the narrow metric and one with the wide metric. This allows backward compatibility with older devices that only support narrow metrics12.

NEW QUESTION # 31
Exhibit.

Referring to the exhibit; the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.
What are two solutions that will solve this problem? (Choose two.)

A. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
B. Add the external interface prefix to the IGP routing tables
C. Add the internal interface prefix to the BGP routing tables.
D. On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy

Answer: A,B

Explanation:
Explanation
the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table.
Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5.
This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround for a pure IP network, but it may not work well for an MPLS network.

NEW QUESTION # 32
Referring to the exhibit, which statement is correct?

A. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.
B. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.
C. The route-distinguisher configuration will stop routes from being shared between CE-1 and CE-2.
D. The vrf-target configuration will stop routes from being shared between CE-1 and CE-2.

Answer: B

NEW QUESTION # 33
Which origin code is preferred by BGP?

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

Answer: C

Explanation:
Prefer the route with the lower origin code. Routes learned from an IGP have a lower origin code than those learned from an exterior gateway protocol (EGP), and both have lower origin codes than incomplete routes (routes whose origin is unknown). https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing-protocols-address-representation.html

NEW QUESTION # 34
Exhibit

Based on the configuration contents shown in the exhibit, which statement is true?

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

Answer: C

Explanation:
This configuration applies to IGMP (Internet Group Management Protocol) and is designed to control multicast group memberships on the interface ge-0/0/0.0.
Breaking Down the Configuration Policy-Statement: block-igmp
policy-statement block-igmp {
term 1 {
from {
route-filter 224.7.7.7/32 exact;
source-address-filter 192.168.100.10/32 exact;
}
then reject;
}
}
This policy blocks IGMP joins for group 224.7.7.7 only if the source IP is 192.168.100.10.
If both conditions match, the request is rejected.
IGMP Configuration on Interface ge-0/0/0.0
[edit protocols igmp]
user@router# show
interface ge-0/0/0.0 {
group-policy block-igmp;
group-limit 25;
}
group-policy block-igmp applies the policy statement block-igmp, meaning IGMP join requests are evaluated based on this policy.
group-limit 25 means the interface allows up to 25 multicast groups.
Evaluating the Answer Choices
✅ A. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10.
Correct, because:
The policy specifically matches group 224.7.7.7 and source IP 192.168.100.10.
If both conditions are met, the join is rejected.
❌ B. Joins for any group are accepted if the group count value is less than 25.
Incorrect, because:
The group-limit (25) applies to the total number of IGMP groups but does not override explicit policy rules.
Even if there are fewer than 25 groups, a join request can still be rejected by the policy statement.
❌ C. Joins for group 224.7.7.7 are always rejected, regardless of the group count.
Incorrect, because:
The policy only blocks joins from the specific source 192.168.100.10.
Joins from other sources to 224.7.7.7 are allowed.
❌ D. Joins for group 224.7.7.7 are accepted if the group count is less than 25.
Incorrect, because:
Joins for 224.7.7.7 from source 192.168.100.10 will always be rejected, even if the group count is below 25.
The group-limit does not override the rejection policy.
"Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10." Official Juniper Documentation Reference:
Junos IGMP Policy Configuration Guide
"A group-policy statement allows filtering IGMP joins based on multicast group address and source IP."

NEW QUESTION # 35
......

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