Enterprise Routing and Switching, Specialist

Here you have the best Juniper JNCIS-ENT practice exam questions

You have 58 total questions to study from
Each page has 5 questions, making a total of 12 pages
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This questions were last updated on May 5, 2025
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Question 1 of 58

Your BGP router receives routes from two upstream ISPs: ISP A and ISP B.

In this scenario, which change would you make to prefer routes from ISP A?

Set the local-preference attribute for all routes received from ISP A to 200 while all routes received from ISP B use the default local-preference value of 100.

Prepend the AS path to all routes received from ISP A while all routes received from ISP B use the default AS path value.

Change the MED value for all routes received from ISP A to 1 while all routes from ISP B remain configured with no MED value.

Set the local-preference attribute for all routes received from ISP A to 50 while all routes received from ISP B use the default local-preference value of 100.

Correct Answer: A

The local-preference attribute in BGP is used to prioritize routes within an autonomous system. A higher local-preference value indicates a more preferred route. By setting the local-preference attribute for routes received from ISP A to 200, which is higher than the default value of 100 used by routes received from ISP B, the BGP router will prefer routes from ISP A over those from ISP B.

Question 2 of 58

Each PC and IP phone in your network is connected to a switch using the same port. All incoming data traffic is untagged and belongs to the v10 VLAN, while traffic coming from the IP phones is tagged with a VLAN value of 20 and should belong to the v20 VLAN on your switch.

In this scenario, which statement is correct?

You must enable the voice VLAN feature on the incoming interfaces and assign the v20 VLAN.

You must enable an IRB interface and assign it to the v10 and v20 VLANs.

You must enable LLDP-MED on the incoming interfaces and assign the v20 VLAN.

You must enable the guest VLAN feature on the incoming interfaces and assign the v20 VLAN.

Correct Answer: A

For handling traffic from IP phones (which is tagged with a VLAN value) and separating it from untagged traffic (usually from PCs), enabling the voice VLAN feature on the incoming interfaces is the correct approach. This configuration allows the switch to recognize and prioritize voice traffic by assigning the v20 VLAN specifically for it, ensuring appropriate handling and quality of service for voice communications.

Question 3 of 58

What are three reasons a BGP route would be hidden? (Choose three.)

The AS Path contains a 0.

It is suppressed by a damping policy.

The Local Preference is 0.

The next hop is unreachable.

It is rejected by a firewall term.

Correct Answer: A, B, D

A BGP route can be hidden for several reasons. First, if the AS Path contains a 0, the route is considered invalid since AS 0 is reserved and should not appear in a valid AS Path. Second, a damping policy can suppress a route if it is determined to be unstable, temporarily hiding it to maintain network stability. Lastly, if the next hop for the BGP route is unreachable, the route cannot be utilized or advertised, leading it to be hidden. These reasons are critical for ensuring reliable and stable BGP route management.

Question 4 of 58

Click the Exhibit button.

You have an ESXi host that is connected to ge-0/0/23 on a Juniper EX Series switch. You added a new VM that will also use the same ge-0/0/23 interface. Unfortunately, the new VM is not able to reach external devices.

Referring to the exhibit, which command would solve this problem?

set vlans default switch-options interface-mac-limit 4

set vlans default switch-options interface-mac-limit 5

set switch-options interface ge-0/0/23.0 interface-mac-limit 3

clear ethernet-switching recovery-timeout interface ge-0/0/23.0

Correct Answer: A

The exhibit shows that the current MAC address limit for interface ge-0/0/23.0 is set to 2, and the limit for the VLAN switch-options is set to 3. Since multiple VMs on the same port may exceed this limit, increasing the VLAN-level MAC address limit will accommodate more MAC addresses across interfaces within the VLAN. Therefore, setting 'vlans default switch-options interface-mac-limit' to a higher value, like 4, ensures that the new VM can communicate without hitting the limit.

Question 5 of 58

Click the Exhibit button.

A routing table contains multiple BGP routes to the same destination prefix. The route preference is the same for each route.

Referring to the exhibit, which route would be selected?

route A

route B

route C

route D

Correct Answer: B

In BGP route selection, the primary criteria is the highest Local Preference. Among the routes listed, Route B has the highest Local Preference value of 150. Therefore, Route B would be selected.