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| Section | Objectives |
|---|---|
| Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| Troubleshooting and Operations | - Performance and monitoring
|
| MPLS and Service Provider Technologies | - MPLS fundamentals
|
| OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| BGP and Routing Policy | - Routing policy control
|
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163. Frage
Click the Exhibit button. 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?
Antwort: A
Begründung:
To re-advertise routes learned from iBGP peers to other iBGP peers within the same AS, ROUTER_1 must act as a route reflector. On Junos, enabling route reflection is done by configuring a cluster ID under the internal BGP group. The cluster ID uniquely identifies the route- reflector cluster and allows ROUTER_1 to reflect iBGP-learned routes to its other iBGP neighbors.
164. Frage
You are designing a high availability solution for a Juniper router with dual Routing Engines (RE).
You want to ensure that the routing protocol state is preserved during an RE switchover. You have already enabled graceful Routing Engine switchover (GRES) and you want to avoid relying on helper routers to maintain the routing protocol state.
In this scenario, which feature would accomplish this behavior?
Antwort: C
Begründung:
Nonstop Active Routing (NSR) synchronizes routing protocol state information between the primary and backup Routing Engines so that protocol sessions remain active during a Routing Engine switchover. Because the protocol state is maintained internally on the router, neighbors are not required to support or act as helpers, allowing routing protocols such as BGP and OSPF to continue operating without session resets.
165. Frage
You are a network architect designing a brand new network. You want to deploy RSVP LSPs in this network.
You are currently in the process of choosing whether to run OSPF or IS-IS as your interior gateway protocol.
In this scenario, which two statements are correct about IGP traffic engineering extensions in an RSVP network? (Choose two.)
Antwort: A,D
Begründung:
In a Juniper Networks environment, deployingRSVP-signaled LSPsrequires a functionalTraffic Engineering Database (TED). This database is populated by the Interior Gateway Protocol (IGP) using specific extensions that carry link-state information beyond simple reachability, such as available bandwidth, administrative groups (link coloring), and Maximum Reservable Bandwidth.
The behavior of these extensions differs betweenOSPFandIS-ISin Junos OS:
* OSPF (Option C):By default, OSPF is a "pure" routing protocol. To support RSVP-TE, it must carry Opaque LSAs (Type 10). According to Juniper documentation, you mustexplicitly configuretraffic engineering within the OSPF protocol hierarchy using the set protocols ospf traffic-engineering command. Without this command, OSPF will not flood the TE information required by the Constrained Shortest Path First (CSPF) algorithm, and LSPs will fail to establish.
* IS-IS (Option D):IS-IS was designed to be extensible through the use of TLVs (Type, Length, Value).
In Junos OS,IS-IS traffic engineering extensions are enabled by defaultonce the protocol is active.
As soon as you enable IS-IS on an interface, it begins to advertise the wide metrics and TE TLVs (like TLV 22 and 135) necessary for building the TED.
This distinction is a common design consideration for network architects. While IS-IS simplifies the rollout of MPLS by having TE enabled "out of the box," OSPF requires that extra configuration step to transition from a standard IGP to a TE-aware protocol.
166. Frage
Referring to the exhibit, which statement is true about VRRP?
Antwort: D
Begründung:
The exhibit shows the show vrrp summary output from two routers, with both routers listing the state of their VRRP group as master. VRRP allows for multiple routers to share a virtual IP address and a virtual MAC address, but usually, only one router is the master at any given time while others are in backup state. However, in some configurations, VRRP can operate in an active/active mode where multiple routers handle traffic simultaneously for load sharing. Since both routers show the state as master and there is no evidence of misconfiguration in the virtual IP addresses or priority, it indicates that VRRP is likely functioning in an active/active setup.
167. Frage
Exhibit:
on a Juniper switch. It shows interfacexe-0/0/4withunit 0andfamily ethernet-switching. Under vlan, it lists members 10;`] Referring to the exhibit, which two statements are true? (Choose two.)
Antwort: B,C
Begründung:
In Junos OS for switching platforms, an interface is configured for Layer 2 bridging under thefamily ethernet- switchinghierarchy. The way an interface handles VLAN traffic depends on its port mode:accessortrunk.
According to Juniper Networks technical documentation, when an interface is configured simply with members <vlan-name/id>, it defaults to anaccess port. In an access port configuration:
* The port is a member of only a single VLAN.
* The portreceives and sends untagged traffic (Option C). Any untagged frame arriving at this interface is implicitly associated with the configured VLAN member.
* The interface does not expect or process 802.1Q tags in incoming frames.
In the exhibit, interface xe-0/0/4 has members 10;. In Junos, the members statement can reference either a VLAN nameor aVLAN ID. However, when the configuration is shown as members 10; without further context of the specific ID mapping, the most precise interpretation of the CLI output provided is thatthe interface is a member of the VLAN named 10 (Option D). While "10" could be the numerical ID, Junos primarily maps members by their defined administrative name.
Why other options are incorrect:
* Option A:Access ports do not receive tagged traffic; only trunk ports (which require the port-mode trunk and vlan members [ ... ] statements) are designed to process tagged frames.
* Option B:While the VLAN named 10likelyhas a VLAN ID of 10, the exhibit does not explicitly confirm the ID mapping. In Junos, a VLAN named "10" could technically have a different tag ID (e.g., VLAN "Office" with ID 10). Option D is the more accurate direct reading of the displayed member configuration.
168. Frage
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