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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 | - Routing policy control
|
| Topic 4: OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Topic 5: Troubleshooting and Operations | - Performance and monitoring
|
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NEW QUESTION # 85
Which two statements are correct about default BGP route propagation? (Choose two.)
Answer: B,D
NEW QUESTION # 86
Click the Exhibit button.
You have configured an MPLS LSP to 192.168.100.3. However, the LSP is in the down state.
Referring to the exhibit, which two actions would solve this problem? (Choose two.)
Answer: B,C
Explanation:
The LSP is using CSPF and the output indicates CSPF cannot build a path because the traffic- engineering database is not available. Enabling OSPF traffic-engineering allows the router to populate the TE database used by CSPF. Alternatively, disabling CSPF forces the LSP to be computed using the normal IGP shortest path, which removes the dependency on the TE database and allows the LSP to come up.
NEW QUESTION # 87
Referring to the exhibit. Routers R1 and R4 have a VRRP priority of 90, while R2 and R3 have default VRRP priorities Referring to the exhibit, which router will be elected as the primary VRRP router?
Answer: D
Explanation:
In a VRRP (Virtual Router Redundancy Protocol) configuration, the router with the highest priority is elected as the primary (master) router. If two or more routers have the same highest priority, the one with the highest IP address is elected.
Default VRRP priority is 100.
From the question:
- R1 and R4 have a priority of 90.
- R2 and R3 have default priority (100).
Since R2 and R3 both have the highest priority (100), VRRP will elect the one with the higher IP address as the master.
- R2: 203.0.113.2
- R3: 203.0.113.3 → higher IP
NEW QUESTION # 88
What happens if an IS-IS router receives a link-state PDU with a higher sequence number than the one in its database?
Answer: B
Explanation:
IS-IS is a link-state protocol that relies on the rapid and consistent flooding ofLink-State PDUs (LSPs)to ensure that every router in an area has an identical view of the topology. To manage the "freshness" of information, IS-IS uses aSequence Number-a 32-bit unsigned integer that increments every time the originating router makes a change to its LSP.
According to Juniper Networks technical documentation, when a router receives an LSP, it performs a comparison between the received LSP and the version it currently holds in itsLink-State Database (LSDB).
If the received LSP has ahigher sequence number, the router concludes that this is "newer" and more accurate information. The router will then perform two immediate actions:
* Update:It replaces the older LSP in its LSDB with the newly received version.
* Flood:It propagates the new LSP to all other neighbors (except the one that sent it) to ensure the entire area converges on the new data.
If the sequence numbers were equal, the router would ignore the incoming PDU as it already has the information. If the received sequence number werelower, the router would conclude its own database is more recent and would actually send its own "newer" version back to the neighbor to bring them up to date (a process called "poisoning" or refreshing the neighbor).Complete Sequence Number PDUs (CSNPs)(Option C) are used during initial database synchronization or periodic checks on broadcast links, but the primary response to a "newer" LSP is immediate database update and flooding.
NEW QUESTION # 89
Which BGP message type is used to re-advertise routes that have already been sent to a peer and acknowledged using TCP?
Answer: C
Explanation:
In BGP (Border Gateway Protocol), the Update message is used to advertise new routes to a peer or to withdraw previously advertised routes. If there's a change in the routing information or if a new route needs to be advertised, BGP uses an Update message. This message is crucial for maintaining the most current and accurate routing information among BGP peers.
The other message types serve different purposes:
Keepalive: This message type is used to maintain the connection between BGP peers and ensure that the link is still active. Keepalive messages are periodically sent between peers when there is no other BGP activity to maintain the session.
Notification: This message is used to indicate errors or other significant events to a BGP peer. If a BGP error condition is detected, a Notification message is sent and the BGP session is typically closed.
Refresh: This is not a standard BGP message type. However, in the context of BGP, Route Refresh is a capability (not a message type) that allows a BGP router to request a full or partial re-advertisement of routes from a peer. This helps in re-synchronizing routing tables without tearing down the BGP session.
The BGP Update message is used to advertise routable destinations and includes route advertisements, route withdrawals, and path attribute modifications. Update messages are used to re-advertise routes that have already been acknowledged.
NEW QUESTION # 90
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