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| Section | Objectives |
|---|---|
| Topic 1: Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| Topic 2: MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Topic 3: BGP and Routing Policy | - BGP fundamentals
|
| Topic 4: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| Topic 5: Troubleshooting and Operations | - Network troubleshooting methodology
|
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NEW QUESTION # 73
Referring to the exhibit, where should next-hop-self-policy be applied to alter the next-hop value?
Answer: B
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 # 74
Exhibit:
Referring to the exhibit, why is the ge-0/0/0.0 interface shown as belonging to Level 3?
Answer: D
Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol as implemented in Junos OS, the output of operational commands uses specific numerical representations to denote the hierarchy levels of a neighbor adjacency. Understanding these values is crucial for troubleshooting peering relationships in a multi-level IS- IS network.
According to Juniper Networks technical documentation, the show isis adjacency command displays the status of the neighbors. The "L" column indicates the level of the adjacency:
* Level 1:Indicates the adjacency is strictly for intra-area routing.
* Level 2:Indicates the adjacency is strictly for backbone/inter-area routing.
* Level 3:This is ashorthand representationused by Junos to indicate that a single adjacency has been established forboth Level 1 and Level 2 simultaneously.
The critical distinction in this question lies in the interface type. On abroadcast interface(such as standard Ethernet), IS-IS typically establishes and maintains separate adjacencies for Level 1 and Level 2. In the CLI output for a broadcast link, you would generally see two separate lines for the same neighbor-one for Level
1 and one for Level 2.
However, on apoint-to-point (P2P)interface, IS-IS can negotiate both levels within a single adjacency. When this occurs, Junos consolidates the output into a single entry and usesLevel 3to signify that the adjacency is functional for both levels. Since the exhibit shows ge-0/0/0.0 as Level 3, it confirms that the link is configured with a point-to-point encapsulation (either natively or via the interface-type p2p command) and is acting as a Level 1/2 adjacency.
Option B is incorrect as the number "3" refers to protocol levels, not the count of neighbors. Option C is a reference to data center architectures that does not influence IS-IS level nomenclature. Option D is incorrect because, as noted, broadcast interfaces display these levels separately rather than using the Level 3 shorthand.
NEW QUESTION # 75
What are two types of BGP messages exchanged while in the Established state? (Choose two.)
Answer: A,B
Explanation:
In theBorder Gateway Protocol (BGP)finite state machine (FSM), theEstablishedstate is the final and functional stage of a BGP peering session. According to Juniper Networks technical documentation, once a session reaches this state, the two peers have successfully exchanged Open messages and agreed upon session parameters (such as AS numbers, hold timers, and BGP identifiers). Only after the session is "Established" can the routers begin the actual exchange of network layer reachability information (NLRI).
The most frequent message type exchanged in the Established state is theUPDATEmessage. These messages are the heart of BGP operations; they are used to advertise new feasible routes to a peer or to withdraw routes that are no longer reachable. An UPDATE message contains path attributes (like AS-Path, Next-Hop, and Local Preference) and the associated prefixes. In a stable network, UPDATE messages are only sent when there is a change in the topology, adhering to BGP's incremental update philosophy.
The second message type that can be exchanged in this state is theNOTIFICATIONmessage. While ideally, a session stays established, any detected error-such as a hold timer expiration, a malformed update, or a manual "clear" command-will trigger the transmission of a NOTIFICATION message. This message informs the peer of the specific error code and immediately causes the BGP session to transition back to the Idle state, tearing down the TCP connection.
It is important to note thatOPENmessages (Option A) are only used during the session initialization phase to transition from the OpenConfirm state to Established.REQUEST(Option B) is not a valid BGP message type defined in the standard (RFC 4271); the closest equivalent in functionality would be a Route-Refresh message, which is a separate extension. Therefore, in the context of standard BGP operations within the Established state, Updates and Notifications are the correct answers.
NEW QUESTION # 76
You are troubleshooting a Level 1 IS-IS router that has an adjacency with a Level 1/2 router. Which two statements are correct in this scenario? (Choose two.)
Answer: A,C
Explanation:
In the context ofJuniper Networks Junos OSand theIS-IS (Intermediate System to Intermediate System) protocol, understanding the hierarchical relationship between router levels is critical for effective troubleshooting and design. IS-IS uses a two-level hierarchy to manage scalability:Level 1 (L1), which represents intra-area routing, andLevel 2 (L2), which represents inter-area backbone routing.
When a router is configured as aLevel 1/2 (L1/L2)device, it acts as a bridge between the two levels.
According to Juniper technical documentation, an L1/L2 router maintains two completelyseparate Link- State Databases (LSDB)-one for Level 1 and one for Level 2. It does not merge these into a single topology. This separation ensures that local area topology changes (L1) do not necessarily flood into the backbone (L2) unless specific redistribution is configured, and vice versa. Therefore, statementCis correct because the L1/L2 router maintains distinct SPF (Shortest Path First) computations for each level.
Regarding the visibility of the Level 1 router, IS-IS is designed to keep L1 areas "stubby" by default. ALevel
1 routeronly possesses the topology information for its own area (the Level 1 LSDB). It does not receive specific L2 routes or the L2 topology. Instead, the L1/L2 router sets theAttached (ATT) bitin its L1 Link- State PDUs (LSPs) to signal to L1-only routers that it has a connection to the backbone. The L1 router then generates a default route pointing to the L1/L2 router to reach inter-area destinations. This confirms that statementDis correct: the L1 router's knowledge is limited to its local L1 topology.
Conversely, statements A and B are incorrect because merging topologies would violate the hierarchical scaling principles of IS-IS, and L1 routers never learn the full L2 topology without explicit, non-standard route leaking.
NEW QUESTION # 77
How are routing loops prevented in internal BGP networks?
Answer: B
Explanation:
The prevention of routing loops within an Autonomous System (AS) is handled differently than loop prevention between ASes. While External BGP (EBGP) uses the AS_PATH attribute to detect loops,Internal BGP (IBGP)does not modify the AS_PATH. Therefore, a different mechanism is required to ensure that a route does not circulate infinitely inside the network.
This mechanism is known as theIBGP Split Horizon rule. According to Juniper Networks documentation and the BGP standard (RFC 4271), a BGP speakermust not advertise a route learned via an IBGP peer to any other IBGP peer. In simpler terms, "what is learned internally, stays local." This rule ensures that a route only travels one "hop" inside the AS-from the router that learned it from an external source to all other internal routers.
Because of this rule, IBGP routers do not naturally propagate routes through each other. This creates a requirement for afull meshof IBGP sessions, where every BGP-speaking router in the AS must have a direct peering session with every other BGP-speaking router. To mitigate the scaling issues of a full mesh in large service provider networks, architects useRoute ReflectorsorConfederations, which are authorized exceptions to the Split Horizon rule.
Option B is incorrect because EBGP peersdoadvertise EBGP routes to other EBGP peers (this is how the internet works). Option C is incorrect because EBGP-learned routesmustbe sent to IBGP peers so the internal network knows how to reach the outside world. Option D is incorrect because internal routesmustbe sent to external peers to advertise your network to the internet.
NEW QUESTION # 78
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