Juniper JN0-351 Online Practice Questions and Exam Preparation

Juniper JN0-351 Online Questions & Answers

• Question 81:

  You are a service provider and have multiple customers in a building.

  You are installing a new switch that can host all of your customers. However, you would like to ensure that one customer cannot see or broadcast to another customer.

  You would also like to have them use a common gateway IP address from the building.

  What should be used to provide this access?

  A. VLAN
  B. private VLAN
  C. filter-based VLAN
  D. Layer 2 tunneling
  B. private VLAN

• Question 82:

  Which two statements about aggregate routes in the Junos OS are correct? (Choose two.)

  A. An aggregate route has a default next hop of an IP address.
  B. An aggregate route always shows as active in the routing table.
  C. An active route can contribute only to a single aggregate route.
  D. Only one aggregate route can be configured for each destination prefix.
  C. An active route can contribute only to a single aggregate route.
  D. Only one aggregate route can be configured for each destination prefix.

• Question 83:

  The next hop for the route is not reachable.

  In this scenario, what are two ways that BGP handles this route? (Choose two.)

  A. The route is placed into the forwarding table as an inactive route.
  B. The route is not placed into the forwarding table.
  C. The route is placed into the routing table as a hidden route.
  D. The route is placed into the forwarding table as a hidden route.
  B. The route is not placed into the forwarding table.
  C. The route is placed into the routing table as a hidden route.

• Question 84:

  Exhibit

  

  You are receiving the BGP route shown in the exhibit from four different upstream ISPs.

  Referring to the exhibit, which ISP will be selected as the active path?

  A. ISP1
  B. ISP 3
  C. ISP 4
  D. ISP 2
  C. ISP 4

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  Explanation/Reference:

  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.

• Question 85:

  Exhibit:

  

  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?

  A. set vlans default switch-options interface-mac-limit 4
  B. set vlans default switch-options interface-mac-limit 5
  C. set switch-options interface ge-0/0/23.0 interface-mac-limit 3
  D. clear ethernet-switching recovery-timeout interface ge-0/0/23.0
  C. set switch-options interface ge-0/0/23.0 interface-mac-limit 3

• Question 86:

  Click the Exhibit button.

  

  Referring to the output shown in the exhibit, which two statements are correct? (Choose two.)

  A. The device is not an ABR.
  B. The device originated the 192.168.1.2 database entry.
  C. The device originated the 192.168.1.1 database entry.
  D. The device is an ABR.
  B. The device originated the 192.168.1.2 database entry.
  D. The device is an ABR.

• Question 87:

  What are two functions of bridging? (Choose two.)

  A. blocking
  B. aging
  C. listening
  D. forwarding
  C. listening
  D. forwarding

• Question 88:

  What is a purpose for the OSPF database description packet?

  A. to transfer the LSA headers between two systems
  B. to determine who is in charge of database flushing
  C. to transfer the LSUs between two systems
  D. to determine who is in charge of adjacency formation
  A. to transfer the LSA headers between two systems

• Question 89:

  You are asked to connect an IP phone and a user computer using the same interface on an EX Series switch. The traffic from the computer does not use a VLAN tag, whereas the traffic from the IP phone uses a VLAN tag. Which feature enables the interface to receive both types of traffic?

  A. native VLAN
  B. DHCP snooping
  C. MAC limiting
  D. voice VLAN
  D. voice VLAN

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  Explanation/Reference:

  The feature that enables an interface on an EX Series switch to receive both untagged traffic (from the computer) and tagged traffic (from the IP phone) is the voice VLAN12.

  The voice VLAN feature in EX-series switches enables access ports to accept both data (untagged) and voice (tagged) traffic and separate that traffic into different VLANs12. This allows the switch to differentiate between voice and data

  traffic, ensuring that voice traffic can be treated with a higher priority12. Therefore, option D is correct.

• Question 90:

  Which statement about aggregate routes is correct?

  A. Aggregate routes can only be used for static routing but not for dynamic routing protocols.
  B. Aggregate routes are automatically generated for all of the subnets in a routing table.
  C. Aggregate routes are always preferred over more specific routes, even when the specific routes have a better path.
  D. Aggregate routes are used for advertising summarized network prefixes.
  D. Aggregate routes are used for advertising summarized network prefixes.

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  Explanation/Reference:

  Aggregate routes are used for advertising summarized network prefixes12. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1. This

  approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.

  Therefore, option D is correct. Options A, B, and C are not correct because:

  Aggregate routes can be used with both static routing and dynamic routing protocols1.

  Aggregate routes are not automatically generated for all of the subnets in a routing table. They need to be manually configured1.

  Aggregate routes are not always preferred over more specific routes. The route selection process in Junos OS considers several factors, including route preference and metric, before determining the active route1.