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| Section | Objectives |
|---|---|
| Border Gateway Protocol (BGP) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP
|
| Open Shortest Path First (OSPF) | - Identify the concepts, operation, or functionality of OSPF
|
| Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
| Protocol-Independent Routing | - Identify the concepts, operation, or functionality of various protocol-independent routing components
|
| IPv6 | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IPv6 - Identify the concepts, operation, or functionality of IPv6
|
| Layer 2 Bridging or VLANs | - Identify the concepts, benefits, or functionality of VLANs
|
| Multiprotocol Label Switching (MPLS) | - Identify the concepts, operation, or functionality of MPLS CoS processing on Junos devices
|
| Intermediate System to Intermediate System (IS-IS) | - Identify the concepts, operation, or functionality of IS-IS
|
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NEW QUESTION # 84
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?
Answer: B
Explanation:
By default, MPLS uses Penultimate Hop Popping (PHP). The penultimate router removes the transport label before forwarding the packet to the egress router. This pop operation allows the egress router to receive the packet without the outer MPLS label and process it more efficiently.
NEW QUESTION # 85
Click the Exhibit button.
Referring to the exhibit, which two statements are true? (Choose two.)
Answer: B,D
Explanation:
The routing table shows two equal-cost next hops for the prefix and both are installed in the forwarding table, which means the router is selecting both next hops for forwarding traffic. This indicates equal-cost multipath forwarding.
The forwarding table entry shows a load-balancing group containing both next hops, which reflects the default Junos behavior of performing load balancing across equal-cost paths when multiple next hops exist for the same route.
NEW QUESTION # 86
Which two statements are correct about BGP? (Choose two.)
Answer: B,D
NEW QUESTION # 87
Which BGP message type is used to re-advertise routes that have already been sent to a peer and acknowledged using TCP?
Answer: B
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 # 88
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: B
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 # 89
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