You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

1. A. MTU is not at least 1492 bytes.
2. B. IP subnets are not a /30 address.
3. C. The Level 2 routers have mismatched areas.
4. D. The lo0 interface is not included as an IS-IS interface.

Correct Answer: AD
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies1. If the MTU is less than this, IS-IS adjacencies will not be established1.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS1. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established1.
Therefore, options A and D are correct.

Exhibit.

The ispi _ inet. 0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?

1. A. The ine
2. B. 0 route table will be completely overwritten by the ispi . ine
3. C. 0 route table.
4. D. The ine
5. E. 0 route table will be imported into the ispi . ine
6. F. 0 route table.
7. G. The ISPI . ine
8. H. 0 route table will be completely overwritten by the ine
9. I. o route table.
10. J. The ISPI . ine
11. K. 0 route table will be imported into the ine
12. L. 0 route table.

Correct Answer: B
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device1. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table2.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table.
In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table. This means that the routes from inet.0 will be imported into ispi.inet.0. Therefore, the correct answer is B. The inet.0 route table will be imported into the ispi.inet.0 route table.
References:
1: Routing Instances Overview 2: Virtual Routing Instances : [rib-group (Routing Options)]

Which two statements correctly describe RSTP port roles? (Choose two.)

1. A. The designated port forwards data to the downstream network segment or device.
2. B. The backup port is used as a backup for the root port.
3. C. The alternate port is a standby port for an edge port.
4. D. The root port is responsible for forwarding data to the root bridge.

Correct Answer: AD
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree1.
Option A suggests that the designated port forwards data to the downstream network segment or device. This is correct because the designated port is the port on a network segment that has the best path to the root bridge1. It??s responsible for forwarding frames towards the root bridge and sending configuration messages into its segment1.
Option D suggests that the root port is responsible for forwarding data to the root
bridge. This is also correct because the root port is always the link directly connected to the root bridge, or the shortest path to the root bridge1. It??s used to forward traffic towards the root bridge1.
Therefore, options A and D are correct.

Exhibit.

You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer
than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?

1. A. The hello-time must be increased.
2. B. The force-version must be removed.
3. C. The bridge priority for EX-4 must be set at 4000.
4. D. The max-age must be increased to 20

Correct Answer: B
✑ The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp. This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP1. This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence2.
✑ The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches3. Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says ??Warning: STP version mismatch with neighbor?? when it receives a BPDU from a RSTP neighbor1.
✑ To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force- version command in configuration mode1.

Exhibit

You are a network operator troubleshooting BGP connectivity.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

1. A. Peer 10.32.1.2 is configured for AS 63645.
2. B. The BGP session is not established.
3. C. The R1 is configured for AS 65400.
4. D. The routers are exchanging IPv4 routes.

Correct Answer: BC
Option B suggests that the BGP session is not established. This is correct because in the output, the state of the BGP session is shown as ??Idle??. In BGP, an ??Idle?? state means that the BGP session is not currently established1.
Option C suggests that R1 is configured for AS 65400. This is also correct because in the output, it??s shown that the local AS number is 654001. The local AS number represents the Autonomous System (AS) number of the router on which you??re checking the BGP session1.