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| Section | Objectives |
|---|---|
| Topic 1: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| Topic 2: Troubleshooting and Operations | - Network troubleshooting methodology
|
| Topic 3: MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Topic 4: BGP and Routing Policy | - Routing policy control
|
| Topic 5: Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
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NEW QUESTION # 81
Exhibit:
You have configured IPv4 and IPv6 in your network and all OSPF neighbors are established. You apply the configuration shown in the exhibit. Which statement is true in this scenario?
Answer: B
Explanation:
In a Juniper Networks environment running Junos OS, understanding the interaction between different versions of OSPF is essential for multi-protocol environments.OSPFv2(defined in RFC 2328) is the standard protocol used for routing IPv4 unicast traffic.OSPFv3(defined in RFC 5340) was originally developed to support IPv6 routing. However, OSPFv3 was later extended via RFC 5838 to support multiple address families (AF), allowing it to carry IPv4 unicast, IPv4 multicast, and other address types within a single OSPF instance.
According to Juniper technical documentation, Junos OS implements this multi-AF support in OSPFv3 through the use ofrealms. When the realm ipv4-unicast statement is configured under the [edit protocols ospf3] hierarchy, the OSPFv3 process becomes capable of calculating and advertising IPv4 routes.
In the provided exhibit, routerR2has a dual-protocol configuration. First, it is running standard OSPFv2, with the ge-0/0/1.0 interface (which is directly connected to the 172.16.2.0/24 network) participating in Area 0.
This ensures that the prefix is advertised as a standard IPv4 LSA to its neighbor,R1. Second, R2 is running OSPFv3 with the realm ipv4-unicast specifically enabled on that same ge-0/0/1.0 interface. Because of this realm, OSPFv3 also treats the 172.16.2.0/24 prefix as a reachable IPv4 destination and advertises it to R1 as an OSPFv3 IPv4-unicast LSA.
As a result, whenR1(which is also running both protocols) receives these routing updates, it will see the same destination prefix advertised by two different protocols. Its routing table (inet.0) will contain one entry learned from the OSPFv2 process and a second, separate entry learned from the OSPFv3 process. While the Junos Routing Engine will ultimately select one as the "active" route based on route preference (both protocols have a default preference of 10), both entries will technically exist within the Routing Information Base (RIB). This confirms that statementBis the correct description of the operational state of the network.
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NEW QUESTION # 82
Which BGP attribute is used to detect routing loops?
Answer: D
NEW QUESTION # 83
You are the administrator for two Junos routers called R1 and R2. These two routers are directly connected to each other. These two routers run IS-IS and BFD. R1 is configured to send BFD packets every 300 milliseconds. R2 is configured to send BFD packets every 400 milliseconds.
In this situation, what is the expected outcome?
Answer: B
Explanation:
With BFD, each side advertises its desired transmit interval, but the session uses an effective transmit/receive behavior that must be acceptable to both ends. The receiving side controls how fast it is willing to be polled by advertising its required minimum receive interval, which results in the effective rate converging to the slower (larger interval) value so that neither router is forced to receive BFD control packets faster than it supports.
NEW QUESTION # 84
What are two types of SIDs used in segment routing? (Choose two.)
Answer: A,B
NEW QUESTION # 85
What is the default route preference for an aggregate route?
Answer: C
Explanation:
In the Junos OS architecture,route preference(often referred to as administrative distance in other vendor platforms) is the primary metric used by the Routing Engine to select the "best" path when multiple protocols provide a route to the same destination. Each routing protocol and route type is assigned a default numeric value; the lower the value, the more preferred the route.
According to Juniper Networks technical documentation, anaggregate routeis assigned a default preference of
130. Aggregate routes are a form of static-like route used to group specific routes into a single, broader prefix to reduce the size of routing tables and limit the scope of routing updates. They are "protocol-independent" because they are not learned from a dynamic neighbor but are manually defined by the administrator.
To understand where130fits in the hierarchy, it is helpful to compare it with other common Junos preferences:
* Directly connected interfaces:0
* Static routes:5
* OSPF Internal:10
* IS-IS Level 1/2:15/18
* Aggregate routes: 130
* OSPF AS External:150
* BGP (Internal and External):170
* Generated routes:150
By setting the aggregate route preference to 130, Junos ensures that specific routes learned via IGPs (like OSPF or IS-IS) are preferred over the aggregate. This is essential because an aggregate route is often used as a
"catch-all" or a discard route when more specific path information is missing. If the aggregate had a lower preference (like 5), it might override dynamic routing information, leading to suboptimal routing or black- holed traffic.
NEW QUESTION # 86
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