You are combining two existing interfaces into a single LAG interface, but you do not see the LAG interface being created. Which two actions are required to solve this problem? (Choose two.)
Correct Answer: A,B
JN0-351 Exam Question 62
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?
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 RSTP. 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 sequence. The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches. 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 neighbor. 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 mode.
JN0-351 Exam Question 63
Referring to the exhibit, all users connected to the same VLAN can communicate with each other, but not with users on other VLANs in this network. What must be configured to enable communication between the VLANs?
Correct Answer: A
JN0-351 Exam Question 64
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)
Correct Answer: B,C
Redundant trunk groups are designed to provide link redundancy. If the primary link fails, the secondary link will automatically take over to ensure continued connectivity. In redundant trunk groups, while regular data traffic is sent over the primary link, Layer 2 control traffic (such as STP, LACP, etc.) is allowed on the secondary link to maintain network stability and protocol operations. https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic- map/redundant-trunk-groups.html
JN0-351 Exam Question 65
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)
Correct Answer: A,C
A is correct because you can deploy only stateless firewall filters on an EX Series switch. A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers. A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or session information. EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters. C is correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch. Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks. EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters. You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.
