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| Section | Objectives |
|---|---|
| Troubleshooting and Operations | - Performance and monitoring
|
| MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| BGP and Routing Policy | - BGP fundamentals
|
| OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
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NEW QUESTION # 62
You are asked to configure a new network environment that will be based on IPv6 and use OSPF. In this scenario, which two statements correctly identify configuration task considerations? (Choose two.)
Answer: B,D
Explanation:
When transitioning to an IPv6 environment usingOSPFv3(the version of OSPF designed for IPv6), there are significant architectural differences compared to OSPFv2 (IPv4). According to Juniper Networks technical documentation, OSPFv3 was redesigned to be more protocol-agnostic.
Router ID (Option C):
Despite OSPFv3 routing IPv6 (which uses 128-bit addresses), the OSPFRouter IDremains a32-bit value formatted like an IPv4 address (e.g., 1.1.1.1). This is a common point of confusion. In a pure IPv6 environment where no IPv4 addresses are configured on any interfaces, a Juniper router cannot automatically derive a Router ID. Therefore, the administrator must manually configure a 32-bit Router ID under [edit routing-options] for the OSPFv3 process to initialize.
Interface Configuration (Option D):
OSPFv3 runs directly over the IPv6 link-local scope. Unlike OSPFv2, it does not require an IPv4 address to function. Therefore, interfaces areonly required to be configured with family inet6(Option D). You do not need "dual-stack" (both IPv4 and IPv6) functionality just to run OSPFv3. The protocol uses the link-local address (fe80::/10) of the interface for neighbor adjacencies and as the next hop for routing updates. This separation allows OSPFv3 to carry multiple "address families" (both IPv4 and IPv6 unicast) if needed, but the base requirement for an IPv6-only network is simply the family inet6 configuration.
NEW QUESTION # 63
Exhibit:
Referring to the exhibit, you have configured R1, R2, R3, and R4 to be a part of OSPF area 0 and you have connected them to a broadcast segment. Assuming all four routers come online within one minute of each other, which router becomes the DR and which router becomes the BDR?
Answer: A
Explanation:
In OSPF networks, when multiple routers are connected to a shared multi-access broadcast segment (like an Ethernet switch), they undergo an election process to select aDesignated Router (DR)and aBackup Designated Router (BDR). This mechanism is essential for reducing the number of adjacencies and limiting the volume of Link State Advertisement (LSA) flooding on the segment.
The OSPF election process follows a strict hierarchy based on the following criteria:
* Interface Priority:The router with the highest OSPF interface priority is elected as the DR. The router with the second-highest priority becomes the BDR. In Junos, the default priority is 128, but it can be manually configured between 0 and 255.
* Router ID:If there is a tie in priority, the router with the numerically highest Router ID (RID) wins the election.
Analyzing the configuration provided in the exhibit:
* R1:Priority 200, Router-ID 192.168.1.1
* R2:Priority 100, Router-ID 192.168.1.2
* R3:Priority 50, Router-ID 192.168.1.3
* R4:Priority 90, Router-ID 192.168.1.4
Comparing the priority values,R1 has the highest priority (200)and therefore becomes theDR. The next highest priority value among the remaining routers is100, which belongs to R2, making it theBDR. Although R4 has a higher Router ID than R2, the priority value is evaluated first and takes precedence.
Since all routers came online within a short window (one minute), they participate in the same election cycle, ensuring the configured priorities dictate the outcome rather than "first-come, first-served" preemption behavior common in OSPF once a DR is already established.
NEW QUESTION # 64
Click the Exhibit button. You must configure the router called ROUTER_1 to take all valid prefixes learned from internal BGP peers in AS 64523, and then re-advertise them to other internal BGP peers in the same autonomous system.
Referring to the exhibit, which configuration must you deploy on ROUTER_1 to accomplish this task?
Answer: D
Explanation:
To re-advertise routes learned from iBGP peers to other iBGP peers within the same AS, ROUTER_1 must act as a route reflector. On Junos, enabling route reflection is done by configuring a cluster ID under the internal BGP group. The cluster ID uniquely identifies the route- reflector cluster and allows ROUTER_1 to reflect iBGP-learned routes to its other iBGP neighbors.
NEW QUESTION # 65
Which two events cause a static route to be removed from a routing table? (Choose two.)
Answer: C,D
Explanation:
In Junos OS, astatic routeis a manually configured entry in the routing table. Unlike dynamic routes, which have built-in timers and aging mechanisms, static routes are generally "permanent" as long as their conditions for validity are met.
1. Manual Removal (Option A):
Since static routes are explicitly defined by the administrator, the most direct way to remove one is through a configuration change. Using the delete routing-options static route <prefix> command followed by a commit will immediately remove the route from the Routing Information Base (RIB).
2. Next-Hop Reachability (Option B):
For a static route to be "active" and installed in the forwarding table, itsnext-hop must be reachable. If a static route points to a specific physical interface or an IP address on a local segment, and thatoutbound interface becomes unavailable(e.g., the link goes "Down"), the Junos kernel detects that the next-hop is no longer viable. Consequently, the route is marked as "hidden" or "inactive" and is removed from the active forwarding table to prevent traffic from being black-holed.
Why other options are incorrect:
* Aging (Option C):Static routes do not have an expiration timer based on traffic. Even if no packet is sent for years, the route remains as long as the interface is up.
* Remote Reachability (Option D):Standard static routes only track the status of the local interface or the immediate next-hop. They do not possess "end-to-end" visibility. If a host two hops away fails, the local router has no way of knowing this via the static route itself. To achieve this level of tracking, features likeRPM (Real-time Performance Monitoring)orBFD (Bidirectional Forwarding Detection)must be linked to the static route.
NEW QUESTION # 66
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: C,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 # 67
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