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| Section | Objectives |
|---|---|
| Border Gateway Protocol (BGP) | - Identify the concepts, operation, or functionality of BGP
|
| Multiprotocol Label Switching (MPLS) | - Identify the concepts, operation, or functionality of MPLS CoS processing on Junos devices
|
| Layer 2 Bridging or VLANs | - Identify the concepts, benefits, or functionality of VLANs
|
| Protocol-Independent Routing | - Identify the concepts, operation, or functionality of various protocol-independent routing components
|
| Open Shortest Path First (OSPF) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot OSPF
|
| Spanning Tree Protocols | - Identify the concepts, operation, or functionality of STP
|
| IPv6 | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IPv6 - Identify the concepts, operation, or functionality of IPv6
|
| Intermediate System to Intermediate System (IS-IS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS
|
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NEW QUESTION # 54
Exhibit:
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:
In theBorder Gateway Protocol (BGP), theSplit Horizonrule is a fundamental loop-prevention mechanism for internal sessions. This rule dictates that a BGP speaker must not advertise a route learned from anInternal BGP (IBGP)peer to any other IBGP peer within the same Autonomous System (AS). This ensures that routes do not circulate infinitely inside a network, as IBGP does not modify the AS_PATH attribute. Consequently, to maintain full reachability, a network normally requires a "full mesh" of IBGP sessions, where every BGP- speaking router is directly peered with every other router.
In the provided exhibit,ROUTER_1is part of AS 64523. The requirement is for ROUTER_1 to take prefixes learned from its internal peers and re-advertise them to other internal peers in the same AS. This behavior is a direct violation of the standard Split Horizon rule. According to Juniper Networks technical documentation, the standard solution to scale IBGP without a full mesh is to configureRoute Reflection.
When a router is configured as aRoute Reflector (RR), it is permitted to "reflect" (re-advertise) routes learned from one IBGP peer to another. In Junos OS, the mechanism to enable Route Reflection is to configure acluster IDwithin the BGP group. By adding the cluster keyword followed by a unique 32-bit identifier (usually the router's loopback address) to the internal BGP group configuration, the router assumes the role of an RR. It then follows specific reflection rules:
* Routes learned from anEBGP peerare reflected to all IBGP peers.
* Routes learned from aRoute Reflector Clientare reflected to all other clients and non-clients.
* Routes learned from anon-clientare reflected to all clients.
Option A is incorrect because BGP advertisement rules are hard-coded; a standard export policy cannot override the Split Horizon rule. Option C handles traffic engineering tags but does not enable route reflection.
Option D would change the session to EBGP, which does not address the internal reachability requirement within AS 64523. Therefore, configuring the cluster ID is the only valid way to achieve the desired re- advertisement behavior.
NEW QUESTION # 55
Which two statements are correct when using LDP? (Choose two.)
Answer: A,D
Explanation:
With Label Distribution Protocol (LDP), a full mesh of label-switched paths (LSPs) is automatically created between all LDP-enabled routers, and these paths are reflected in the inet.3 table. LDP LSPs are set up when LDP is enabled on interfaces connecting routers in an MPLS network.
NEW QUESTION # 56
Which BGP message type is used to re-advertise routes that have already been sent to a peer and acknowledged using TCP?
Answer: D
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 # 57
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: D
Explanation:
Downstream unsolicited label distribution means that an LSR advertises labels to its neighbors without receiving a specific request. In this mode, routers automatically advertise labels for all known FECs, such as loopback prefixes learned through the IGP, which results in labels being distributed for every reachable prefix.
NEW QUESTION # 58
Which OSPF packet type is used to initiate and maintain neighbor relationships?
Answer: A
Explanation:
TheHello packetis the most basic, yet most vital, component of the OSPF protocol. It serves as the primary mechanism for neighbor discovery, parameter negotiation, and "keepalive" functionality. Per Juniper Networks' routing documentation, OSPF routers use the Hello protocol to dynamically discover other OSPF- enabled routers on their directly connected segments.
When OSPF is enabled on a Junos interface, the router begins multicasting Hello packets (typically to the
224.0.0.5"All OSPF Routers" address). This initiates the neighbor relationship. For two routers to move beyond theInitstate and become neighbors, they must agree on several critical parameters contained within the Hello packet:
* Area ID:Routers must be in the same OSPF area.
* Authentication:Passwords or keys must match.
* Timers:The Hello and Dead intervals must be identical.
* Options:Such as Stub area flags.
Beyond the initial "initiation," the Hello packet is used tomaintainthe relationship. By continuously sending these packets at a fixed interval (the Hello interval), a router signals to its peers that it is still functional. If a router stops receiving Hello packets from a neighbor for a duration exceeding theDead Interval, it declares the neighbor "down," flushes the associated LSAs from the database, and triggers a new SPF calculation.
Furthermore, on multi-access networks like Ethernet, the Hello packet is the vehicle for the election of the Designated Router (DR)andBackup Designated Router (BDR). By exchanging priority values and Router IDs within the Hello packets, the segment can elect a central point of contact to minimize the number of adjacencies required on the wire.
NEW QUESTION # 59
......
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