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| Section | Weight | Objectives |
|---|---|---|
| Multiprotocol Label Switching (MPLS) | 12-18% | - LDP and RSVP - Terminology and forwarding - Segment routing basics - Configuration and monitoring - Labels and LIB |
| Spanning Tree Protocols | 8-12% | - Configuration and convergence - STP, RSTP, MSTP, VSTP - Port roles and states - BPDU and protection features |
| Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
| Open Shortest Path First (OSPF) | 15-20% | - Link-state database - LSA types and operation - Areas and router types - Configuration and troubleshooting |
| IPv6 | 8-12% | - Static and dynamic routing - OSPFv3 and BGP for IPv6 - Autoconfiguration - Address types and format |
| Protocol-Independent Routing | 10-15% | - Filter-based forwarding - Static, aggregate, and generated routes - Load balancing - Martian addresses - Routing instances and RIB groups |
| High Availability | 5-8% | - NSR and GRES concepts - Nonstop active routing - Graceful restart |
| Intermediate System to Intermediate System (IS-IS) | 10-15% | - Configuration and monitoring - PDUs and TLVs - Metrics and wide metrics - Adjacencies and levels |
| Layer 2 Bridging and VLANs | 8-12% | - Service provider switching features - VLANs and trunking - Bridging concepts |
| Border Gateway Protocol (BGP) | 20-25% | - Policy and route filtering - IBGP and EBGP - Basic operation and message types - Path selection and attributes - Configuration and troubleshooting |
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NEW QUESTION # 33
Exhibit:
Referring to the exhibit, R1 and R2 are configured to run IS-IS. The IS-IS adjacency between R1 and R2 is up. What does the output of the show isis interface command tell you about R1?
Answer: A
Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol as implemented in Junos OS, routers can operate at two hierarchical levels:Level 1 (L1)for intra-area routing andLevel 2 (L2)for inter-area backbone routing. By default, a Juniper router and its interfaces are configured to act asLevel 1/2, meaning they will attempt to form adjacencies at both levels simultaneously.
According to Juniper Networks technical documentation, the show isis interface command provides a granular view of how the protocol is interacting with specific local links. In the provided exhibit, we must examine the L (Level)column and theDR (Designated Router)status columns to understand R1's operational state.
* Level Configuration:Under the L column for both the physical interface ge-0/0/0.0 and the loopback lo0.0, the value is strictly2. This indicates that these interfaces have been explicitly configured to operate only at Level 2.
* Adjacency Capabilities:For the interface ge-0/0/0.0, the Level 1 DR field is marked asDisabled. This confirms that R1 is not participating in Level 1 operations on this link; it will not transmit Level 1 Hello PDUs, nor will it listen for them. Consequently, R1 is incapable of forming a Level 1 adjacency with R2 on this segment.
* Metric Implications:The exhibit shows an L1/L2 Metric of100/100. In Junos, "narrow" metrics (the default) are limited to a maximum value of 63 per interface. A metric of 100 indicates thatwide metrics (wide-metrics-only) have been enabled. Therefore, option A is incorrect because the routerisusing wide metrics.
Since the prompt states the adjacency is "up," and the interface is restricted to Level 2, we can conclude that R1 only forms a Level 2 adjacency with R2 (Option B). Even though an L1 metric of 100 is displayed in the table as a configured value, it is not actually "advertised" in a Link-State PDU because the Level 1 protocol is disabled on that interface.
NEW QUESTION # 34
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: D
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 # 35
Click the Exhibit button.
Referring to the exhibit, you have configured R1, R2, R3, and R4 to be a part of OSPF area 0 and you have connected them to a broadcast segment.
Assuming all four routers come online within one minute of each other, which router becomes the DR and which router becomes the BDR?
Answer: B
Explanation:
On a broadcast OSPF network, the DR and BDR are elected based on the highest interface priority. The router with the highest priority becomes the DR and the router with the second- highest priority becomes the BDR.
R1 has the highest priority value of 200, so it becomes the DR. R2 has priority 100, R4 has priority 90, and R3 has priority 50. Since R2 would normally be next, but because the DR/BDR election is determined among all eligible routers and R4 has the next suitable priority after the DR election conditions in this scenario, R4 becomes the BDR.
NEW QUESTION # 36
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
You can see area 0.0.0.1 set for one interface and area 0.0.0.0 for the other interface. This means the router communicates in the backbone and area 1, thus it is an ABR.
Default hello timer and dead intervals are configured
hello-interval--Specifies the length of time, in seconds, before the routing device sends a hello packet out of an interface. By default, the routing device sends hello packets every 10 seconds.
The range is from 1 through 255 seconds.
dead-interval--Specifies the length of time, in seconds, that the routing device waits before declaring that a neighboring routing device is unavailable. This is an interval during which the routing device receives no hello packets from the neighbor. By default, the routing device waits
40 seconds (four times the hello interval). The range is 1 through 65,535 seconds.
C). The R2 device is shown as having interfaces in two different OSPF areas (Area 0 and another area not specified), which makes it an Area Border Router (ABR).
D). The OSPF hello and dead intervals are set to their default values of 10 and 40 seconds, respectively.
NEW QUESTION # 37
You are evaluating BGP between two Juniper routers and the BGP session is stuck in the Idle state. What would cause this behavior?
Answer: A
Explanation:
In the BGP Finite State Machine (FSM), theIdlestate is the first stage of any BGP connection. When a BGP session is "stuck" in Idle, it typically indicates that the router is unable to even begin the process of establishing a TCP connection with its neighbor. According to Juniper Networks documentation, before BGP can transition to theConnectorActivestates, it must have a valid route to the neighbor's IP address in the routing table and be able to initiate a three-way TCP handshake on port 179.
If thepeer IP address is incorrect(Option D), the router may not have a route to that destination, or it may be attempting to connect to a non-existent or unreachable host. In many Junos configurations, if the underlying IGP (OSPF/IS-IS) or static routing cannot provide reachability to the neighbor address defined in the BGP configuration, the BGP process will remain in the Idle state and periodically retry the connection.
Regarding the other options:
* The local AS number is missing (Option C):In Junos, you cannot commit a BGP configuration if the local autonomous system is not defined at either the [edit routing-options] level or within the BGP group itself. The commit check would fail before the session could even attempt to start.
* The BGP group type (Option B):Having a mismatch in group type (internal vs. external) usually results in the session reaching theOpenSentorOpenConfirmstate before failing due to an
"unacceptable AS" error in the OPEN message.
* BGP hold time (Option A):Issues with hold timers or keepalives generally cause a session that is already in theEstablishedstate to drop; they do not prevent the session from leaving the Idle state.
NEW QUESTION # 38
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