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| Section | Objectives |
|---|---|
| Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| BGP and Routing Policy | - Routing policy control
|
| Troubleshooting and Operations | - Network troubleshooting methodology
|
| MPLS and Service Provider Technologies | - VPN services
|
>> JN0-364 Latest Study Questions <<
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NEW QUESTION # 34
Which IPv6 extension header is used to specify intermediate nodes for a packet's path?
Answer: A
Explanation:
In the IPv6 architecture, the base header is kept at a fixed size of 40 bytes to streamline processing. Any additional features or options are handled byExtension Headers, which are inserted between the IPv6 header and the upper-layer protocol. According to Juniper Networks technical documentation and RFC 8200, when a source node needs to list one or more intermediate nodes to be "visited" on the way to the final destination, it utilizes theRouting extension header (Option B).
The Routing header is functionally similar to the "Source Route" option in IPv4. When a packet contains a Routing header, it is addressed to the first intermediate node listed in the header. That node examines the header, swaps its own address with the next address in the list, and forwards the packet. This process continues until the packet reaches the final destination. This is a foundational component for technologies like Segment Routing over IPv6 (SRv6), where the Routing header (specifically the Segment Routing Header or SRH) is used to steer traffic through a specific set of service instructions or nodes.
To distinguish this from the other options:
* Hop-by-hop options (Option A):These carry information that must be examined byeverynode along the path (such as Router Alert), not just specific intermediate nodes.
* Fragment (Option C):This is used only when the source node needs to fragment a packet that exceeds the path MTU.
* Destination options (Option D):These carry optional information intended specifically for the destination node (or nodes listed in a Routing header), but they do not dictate the path themselves.
NEW QUESTION # 35
Referring to the exhibit, which statement is correct?
Answer: B
Explanation:
Referring to the configuration in the exhibit, R1 is set to export the 3rd_Policy to the neighbor at
192.168.1.5. Since 3rd_Policy permits the 10.200.3.0/24 prefix, only that prefix will be advertised to the neighbor.
NEW QUESTION # 36
Which BGP attribute Is used to detect touting loops?
Answer: B
Explanation:
The AS path is a BGP attribute that lists the autonomous systems (AS) that routing information has passed through to get to a destination. It is used to detect and prevent routing loops by checking if the router's own AS number is in the path.
NEW QUESTION # 37
You are monitoring OSPF on a router and notice frequent state changes between Full and Down. Which condition would cause this behavior?
Answer: C
Explanation:
When troubleshooting OSPF in a service provider environment, distinguishing between "stuck" adjacencies and "flapping" adjacencies is the first step. A session that transitions frequently betweenFullandDown indicates that the relationship can be established successfully (meaning parameters match), but it cannot be maintained.
According to Juniper Networks documentation, the most common cause for a session to drop from Full to Down is the expiration of theDead Interval. If a router does not receive a Hello packet within the Dead Interval (usually 40 seconds), it tears down the adjacency. Aphysical interface flapping (Option A)is the primary trigger for this. If the physical link or the underlying transport (like a leased line or a microwave link) goes down even momentarily, the OSPF process immediately detects the interface failure, flushes the neighbors, and moves the state to Down. As soon as the interface comes back up, the routers perform the Hello exchange and reach the Full state again, creating the flapping cycle.
Analysis of other options:
* MTU Mismatch (Option D):This typically causes the adjacency to get "stuck" in theExchangeor ExStartstate. The routers can exchange small Hello packets, but when they try to send larger Database Description (DBD) packets that exceed the MTU, the packets are dropped, preventing the session from ever reaching "Full."
* Area ID Mismatch (Option C):This prevents the adjacency from even reaching theInitstate; the routers will never form a neighbor relationship.
* Route Preference (Option B):This affects which route is chosen for the forwarding table but has no impact on the OSPF neighbor state machine itself.
NEW QUESTION # 38
You want to share routes between two routing instances that you have configured? What are two ways to accomplish this task? (Choose two.)
Answer: B,C
Explanation:
Static route with a next-hop of next-table pointing to the appropriate routing table which contains more accurate information rib-groups to mirror routing information from one route-table to another. However, in many cases, in order to make this work, interface-routes also need to be mirrored. RIB Group policy can be used to constrain the routing information instance-import and instance-export statements configured within the individual routing-instances to leak routes from one table to another. Again, policy can be used here to constrain the routing information. This method is more straightforward than the rib-group method A final approach is to use physical interfaces or logical- tunnels to stitch routing-instances and use a routing protocol or static routes across this connection between the two routing-instances.
To share routes between two routing instances on a Junos device, you can configure an instance import policy in one or both instances to import routes from the other instance. Alternatively, a RIB (Routing Information Base) group can be used to share routes between instances.
NEW QUESTION # 39
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