Get Juniper JN0-351 Exam Practice Questions - Real and Updated

Answer : B

The default keepalive time for BGP is60 seconds1.The keepalive time is the interval at which BGP sends keepalive messages to maintain the connection with its peer1.If the keepalive message is not received within the hold time, the connection is considered lost1.By default, the hold time is three times the keepalive time, which is180 seconds1.

Answer : C

The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails1.GRES preserves interface and kernel information, ensuring that traffic is not interrupted1.However, GRES does not preserve the control plane1.

To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR)1.When GRES is combined with NSR, nearly 75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES1.Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur1.

Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd1.

Answer : B

The exhibit shows the configuration of RSTP on EX-4, which has the commandforce-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 thedelete protocols rstp force-versioncommand in configuration mode1.

Answer : C

In BGP, the path selection process is based on a set of attributes1.The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on1.If all these attributes are the same, then it prefers the path with the shortest AS path1.

Referring to the exhibit, all four ISPs have the same weight, local preference, and origin1.However, ISP 4 has the shortest AS path1. Therefore, ISP 4 will be selected as the active path. So, option C is correct.

Answer : B

The management IP address of a device is the IP address that is used to access the device for configuration and monitoring purposes. It is usually assigned to a dedicated management interface that is separate from the data interfaces. The management interface can be accessed via SSH, Telnet, HTTP, or other protocols.

In the exhibit, the list of interfaces and their statuses shows that the management interface is me0. This interface has an admin status of up, a protocol status of inet, a local address of 172.23.12.100/24, and a remote address of unspecified. This means that the me0 interface is active, has an IPv4 address assigned, and is not connected to another device.

Therefore, the management IP address of the device shown in the exhibit is 172.23.12.100.

: [Management Interfaces Overview] : [Displaying Interface Status Information]