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| Section | Objectives |
|---|---|
| Topic 1: Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| Topic 2: Troubleshooting and Operations | - Network troubleshooting methodology
|
| Topic 3: MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Topic 4: OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Topic 5: BGP and Routing Policy | - Routing policy control
|
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NEW QUESTION # 67
You have configured an MPLS LSP that begins on R1 and terminates on R5 using the Junos default settings.
Referring to the exhibit, which router will perform only label swap operations?
Answer: C
Explanation:
In an MPLS network, routers are categorized by their role along a Label Switched Path (LSP). In this scenario, the LSP originates onR1 (Ingress LER)and terminates onR5 (Egress LER). Between these two endpoints are the Provider (P) routers, also known as Transit Label Switching Routers (LSRs), which include R2, R3, and R4.
To identify which router performsonlylabel swap operations, we must look at the standard Junos data plane behavior:
* R1 (Ingress LER):Performs aPushoperation. It receives native IP traffic from Networks 1 or 2, looks up the destination, and imposes (pushes) an MPLS label onto the packet before sending it to R2.
* R2 and R3 (Transit LSRs):These routers perform aSwapoperation. They receive a labeled packet, look up the incoming label in their Label Forwarding Information Base (LFIB), replace it with an outgoing label provided by the downstream neighbor, and forward it.
* R4 (Penultimate Hop):By default, Junos usesPenultimate Hop Popping (PHP). Because R4 is the second-to-last router before the egress (R5), the egress router R5 advertises an "implicit-null" label (Label 3) to R4. This instructs R4 to perform aPopoperation-removing the MPLS label entirely-and sending the native IP packet to R5.
* R5 (Egress LER):Receives the packet (which is already unlabeled due to PHP) and performs a standard IP route lookup to reach the final destination in Network 3 or 4.
Among the options provided,R3is the only router that is a transit LSR butnotthe penultimate hop. While R2 also performs a swap, it is not an option. R4 performs a Pop (due to PHP), R1 performs a Push, and R5 performs an IP lookup. Therefore, R3 is the correct answer as it solely performs the label swap operation.
NEW QUESTION # 68
You are configuring LDP in a service provider network. After enabling LDP on core interfaces, you notice that labels are being advertised for every loopback IPv4 address that is in your IGP.
Which label distribution mode is being used in this scenario?
Answer: B
Explanation:
Downstream unsolicited label distribution means that an LSR advertises labels to its neighbors without receiving a specific request. In this mode, routers automatically advertise labels for all known FECs, such as loopback prefixes learned through the IGP, which results in labels being distributed for every reachable prefix.
NEW QUESTION # 69
Exhibit:
Referring to the exhibit, R1 and R2 are advertising the same prefix 203.0.113.0/24 to R3 and R4 over EBGP. R3 and R4 both advertise this prefix to R5. Which advertisement does R5 choose to install in its routing table?
Answer: A
Explanation:
In a Juniper Networks environment, when a router receives multiple BGP paths for the same destination prefix, it utilizes theBGP Path Selection Algorithmto determine the single "best" path to install in the routing table and advertise to other peers. This selection process follows a strict hierarchy of attributes.
According to Juniper Networks technical documentation, the very first attribute evaluated by the BGP process (after ensuring the next hop is reachable) is theLocal Preference. Local preference is a well-known discretionary attribute used to communicate a preference for a specific exit point from the local Autonomous System (AS). A higher local preference value is always preferred over a lower one.
Analyzing the exhibit:
* R3receives the prefix from R1 and applies an export policy to its IBGP session that sets thelocal preference to 150.
* R4receives the same prefix from R2 and applies an export policy to its IBGP session that sets thelocal preference to 200.
* R5receives both of these IBGP updates from R3 and R4.
When R5 runs the best-path algorithm for the 203.0.113.0/24 prefix, it compares the local preference values.
Since the path from R4 has a local preference of 200 and the path from R3 has a local preference of 150, R5 immediately selects the path fromR4as the best route. Because BGP is designed to prevent loops and maintain a consistent view, only this single best path is installed as the active route in R5's routing table (inet.0).
Options B and D are incorrect because they imply multiple paths are installed for forwarding, which only occurs if specific multipath load-balancing is configured, which is not indicated here.
NEW QUESTION # 70
Referring to the exhibit. Which two statements ate correct about the actions taken as the packet traverses the service provider MPLS network from Site 1 to Site 2 as shown in the exhibit?
(Choose two.)
Answer: A,D
Explanation:
In MPLS (Multiprotocol Label Switching) networks, routers use label switching to forward packets.
The first router at the edge of the MPLS network (R1) will perform a lookup in the mpls.0 table to determine the label to attach to the packet as it enters the MPLS network. This label informs the next routers in the MPLS network (like R2) on how to forward the packet. Internal MPLS routers, like R2, also perform lookups in their mpls.0 table to determine how to switch the packet toward its destination (label swapping). The inet.3 table is used for resolving next-hop information for labeled routes, but it's the mpls.0 table that is used for label switching decisions.
NEW QUESTION # 71
Which two statements are correct about IS-IS interface metrics? (Choose two.)
Answer: B,D
Explanation:
metric--Metric value. Range: 1 through 63, or 1 through 16,777,215 (if you have configured wide metrics) Default: 10 (for all interfaces except lo0), 0 (for the lo0 interface)
NEW QUESTION # 72
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