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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q130-Q135):

NEW QUESTION # 130
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 # 131
You are configuring BGP on a Juniper router to peer with an external provider. After committing the configuration, the BGP session remains in the Idle state.
Which configuration issue would prevent the BGP session from progressing beyond the Idle state?

Answer: B

Explanation:
The Idle state means the router has not successfully initiated a TCP connection to the BGP peer.
If the peer IP address is unreachable, the router cannot establish the required TCP session on port 179, so the BGP process remains in the Idle state and does not progress to the Connect or Active states.


NEW QUESTION # 132
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: A

Explanation:
In the context of theLabel Distribution Protocol (LDP), the method by which a router advertises labels to its neighbors is defined by itsLabel Advertisement Mode. According to Juniper Networks documentation and industry standards (RFC 5036), there are two primary modes:Downstream Unsolicited (DU)and Downstream on Demand (DoD).
InDownstream Unsolicited (DU)mode, which is the default behavior for Junos OS and most service provider implementations, an LSR (Label Switching Router) does not wait for a specific request from its neighbors.
Instead, as soon as the LSR learns a prefix through its Interior Gateway Protocol (IGP) and establishes an LDP session, it automatically generates a label for that prefix and advertises it to all of its LDP peers. This explains the scenario where labels appear for every loopback address in the IGP as soon as LDP is enabled.
DU mode is highly efficient for fast convergence because the labels are already present in the neighbors' databases before they are even needed for traffic forwarding.
By contrast,Downstream on Demand (DoD)requires a router to explicitly request a label for a specific prefix from its next-hop neighbor.Ordered Control (Option B)andIndependent Controlrefer to thetimingof label creation (whether a router waits for the next-hop to provide a label before creating its own), while Conservative Retention (Option A)refers to how a router stores labels it receives but doesn't currently use for forwarding. In the Junos default environment, LDP utilizesDownstream Unsolicitedadvertisement combined withOrdered ControlandLiberal Retentionto ensure a robust and rapidly converging MPLS control plane.


NEW QUESTION # 133
Which two interface types are used as tunnel endpoints? (Choose two.)

Answer: B,C

Explanation:
tunnel-end-point name {
ipv4 {
source-address 10.255.1.1;
destination-address 10.255.2.0/25;
}
gre {
key 9;
}
}
The ip and gr interface types are used as endpoints for various tunneling protocols. ip is a generic term that can refer to any IP-based tunnel, while gr specifically refers to Generic Routing Encapsulation (GRE) tunnel interfaces in Junos.


NEW QUESTION # 134
In IS-IS, what would you use to control which external routes are installed in the routing table?

Answer: C

Explanation:
An import policy is used to control which routes learned from a routing protocol are accepted into the routing table. In IS-IS, applying an import policy allows the router to filter or modify external routes before they are installed in the routing table.


NEW QUESTION # 135
......

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