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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Operations | - Performance and monitoring
|
| Topic 2: BGP and Routing Policy | - BGP fundamentals
|
| Topic 3: OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Topic 4: MPLS and Service Provider Technologies | - VPN services
|
| Topic 5: Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
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NEW QUESTION # 172
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?
Answer: A
Explanation:
In a Multiprotocol Label Switching (MPLS) environment, label operations are categorized into three primary actions:Push(adding a label),Swap(replacing a label), andPop(removing a label). The specific behavior described in the question refers to a mechanism calledPenultimate Hop Popping (PHP).
According to Juniper Networks technical documentation, the goal of PHP is to improve forwarding efficiency at the egress point of a Label-Switched Path (LSP). TheEgress Label Edge Router (LER), which is the final destination for the LSP, would normally have to perform two lookups if it received a labeled packet: first, it would look up the label in its MPLS table to see it is the destination, and second, it would look up the underlying IP payload in its IP routing table (inet.0) to forward the packet.
To alleviate this burden, the Egress LER signals a special label value calledImplicit Null (Label 3)to its upstream neighbor (the penultimate router) during the signaling process (RSVP or LDP). When the penultimate routerreceives a packet destined for that egress LER, it sees the instruction to pop the transport label. Consequently, the penultimate router performs aPopoperation, stripping away the outer MPLS label and sending the raw IP packet (or the remaining inner service label) to the Egress LER.
This allows the Egress LER to perform only a single lookup. If the transport label was the only label, the Egress LER simply performs a standard IP lookup. If there is a VPN label remaining, it performs a single MPLS lookup for the VRF. This "default" behavior in Junos OS optimizes the performance of the egress router by offloading the final label removal to the penultimate hop. Note that ifUltimate Hop Popping (UHP) were configured (via the explicit-null command), the penultimate router would perform aSwapto Label 0 instead of a Pop.
NEW QUESTION # 173
Which two statements are correct about default BGP route propagation? (Choose two.)
Answer: A,D
NEW QUESTION # 174
You want to enable a routing platform with redundant REs to switch from a primary RE to a backup RE without alerting peer nodes. Which two technologies would you use to satisfy this requirement? (Choose two.)
Answer: A,C
Explanation:
Graceful Routing Engine Switchover (GRES) and Nonstop Active Routing (NSR) are two features used in Junos OS to provide high availability. GRES allows for the stateful failover of the Routing Engine, and NSR allows for the continuation of packet forwarding and protocol states during a Routing Engine switchover. These technologies ensure that peer nodes are not alerted during a switchover. VRRP and ISSU serve different purposes and do not apply to this specific requirement.
NEW QUESTION # 175
Referring to the exhibit, where should next-hop-self-policy be applied to alter the next-hop value?
Answer: C
Explanation:
The next-hop-self-policy policy is used to alter the next-hop attribute of BGP routes. When you apply it as an export policy to an external BGP (eBGP) group, it changes the next-hop attribute of the routes being advertised to eBGP neighbors so that the next-hop IP address is the IP address of the router itself. This ensures that the eBGP neighbors use the local router as the next hop to reach these routes.
NEW QUESTION # 176
A service provider receives multiple BGP routes to the same destination prefix. Each route has a different AS path length, but all other attributes are equal.
In this scenario, which statement is correct?
Answer: A
Explanation:
When multiple BGP routes to the same destination have identical attributes except for the AS path length, the BGP best-path selection process prefers the route with the shortest AS path. A shorter AS path indicates a potentially more direct path to the destination and is therefore chosen as the active route.
NEW QUESTION # 177
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