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| Section | Objectives |
|---|---|
| BGP and Routing Policy | - Routing policy control
|
| Troubleshooting and Operations | - Network troubleshooting methodology
|
| MPLS and Service Provider Technologies | - MPLS fundamentals
|
| OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
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NEW QUESTION # 105
What are two requirements for a unified in-service software upgrade? (Choose two.)
Answer: B,D
NEW QUESTION # 106
What prevents routing loops in a single-area OSPF network?
Answer: C
Explanation:
OSPF uses the Dijkstra shortest path first (SPF) algorithm to calculate loop-free paths through the network based on the link-state database. Because every router has a synchronized view of the network topology and independently runs the SPF algorithm, the resulting routing table calculations inherently prevent routing loops.
NEW QUESTION # 107 
In the exhibit, Site A is sending traffic to Site B. R1 adds MPLS label 7166 to direct the traffic to R5. Which two criteria did R1 use to determine which label number to add to the traffic? (Choose two.)
Answer: A,D
Explanation:
In a Juniper Networks MPLS environment, the process by which a router determines how to forward traffic involves both the control plane and the data plane. When R1 (acting as an Ingress Label Edge Router, or LER) receives an IP packet from Site A destined for Site B, it must perform a lookup to decide whether to forward the packet via standard IP routing or via an MPLS Label Switched Path (LSP).
The first criterion R1 uses is thedestination address of the traffic(Option C). Upon receiving the native IP packet, R1 looks up the destination IP in its routing table (typically inet.0). If the destination matches a prefix that is associated with an LSP-such as the loopback address of R5 or a prefix reachable via R5-the router identifies the appropriate Forwarding Equivalence Class (FEC). The FEC essentially groups packets that should be forwarded in the same manner over the same path. Without identifying the destination, the router cannot map the traffic to the correct MPLS tunnel.
The second criterion is thelabel number advertisement received from R2(Option D). MPLS relies on downstream label allocation. In this topology, R2 is the immediate downstream "next hop" for R1 on the path to Site B. For the LSP to be established, R2 must signal a label to R1 using a protocol like LDP (Label Distribution Protocol) or RSVP (Resource Reservation Protocol). This label (in this case, 7166) tells R1: "If you want to send traffic to the destination associated with this LSP, wrap it in this specific label so I know how to process it." R1 does not use the source address (Option A) for standard label mapping, nor does it receive the label directly from R5 (Option B) in a hop-by-hop signaling model; it must use the label provided by its direct neighbor, R2. Therefore, by combining the destination IP (to find the path) and the label provided by the next hop (to encapsulate the packet), R1 successfully directs the traffic through the MPLS core.
NEW QUESTION # 108
You are asked to configure an LSP which uses the OSPF link state database for path computations. Which two statements are correct in this scenario? (Choose two.)
Answer: A,C
Explanation:
In Junos OS, traffic engineering extensions for OSPF, which are required for an LSP to use the OSPF link state database for path computations, are not enabled by default. They must be explicitly enabled in the OSPF configuration. Therefore, answer C is correct. Answer B is incorrect and contradicts C. The 'no-cspf' command would disable CSPF (Constrained Shortest Path First), which is used for path computations in MPLS traffic engineering, so it should not be used if you want the LSP to utilize OSPF's link state database for path computations. Therefore, answer A is incorrect. The 'policing' parameter is not relevant to enabling traffic engineering extensions in OSPF, so answer D is incorrect.
NEW QUESTION # 109
Which two protocols would be used for dynamic routing in IPv6 environments? (Choose two.)
Answer: C,D
Explanation:
IS-IS supports IPv6 routing using the Integrated IS-IS extensions, which allow the protocol to carry IPv6 reachability information using TLVs defined for IPv6.
BGP supports IPv6 routing through Multiprotocol BGP (MP-BGP) extensions that allow the exchange of IPv6 network prefixes between peers using the IPv6 address family.
NEW QUESTION # 110
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