Valid Juniper JN0-352 Study Materials - JN0-352 Exam Test

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Juniper JN0-352 Exam Syllabus Topics:

Section	Objectives
Layer 2 Switching and VLANs	- Native VLANs and voice VLANs - Ports and VLAN tagging - Bridging components - Inter-VLAN routing - Frame processing
Tunnels	- IP tunneling concepts - GRE and IP-IP configuration and troubleshooting
High Availability	- VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG - Virtual chassis and graceful restart
Spanning Tree	- Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence
IS-IS	- Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting
BGP	- Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types
Protocol-Independent Routing	- Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes
OSPF	- Link-state database and packet types - Router ID, adjacencies and neighbors - Areas and LSA types
Layer 2 Security	- Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection - Layer 2 firewall filters - MACsec and storm control

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q67-Q72):

NEW QUESTION # 67
Which two statements correctly describe RSTP port roles? (Choose two.)

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

Answer: A,C

Explanation:
An RSTP topology contains ports that have specific roles:
The root port is responsible for forwarding data to the root bridge.
The alternate port is a standby port for the root port. When a root port goes down, the alternate port becomes the active root port.
The designated port forwards data to the downstream network segment or device.
The backup port is a backup port for the designated port. When a designated port goes down, the backup port becomes the active designated port and starts forwarding data.

NEW QUESTION # 68
Which statement is correct about IP-IP tunnels?

A. IP-IP tunnels only support encapsulating IP traffic.
B. There are 24 bytes of overhead with IP-IP encapsulation.
C. IP-IP tunnels only support encapsulating non-IP traffic.
D. The TTL in the inner packet is decremented during transit to the tunnel endpoint.

Answer: A

Explanation:
"The ENCAPSULATOR does not change the inner IP header, except to decrement the TTL and it remains unchanged during its deliver to the endpoint" - only router that encapsulates the inner packet decrements its TTL - during transit, the inner packet is unchanged.

NEW QUESTION # 69
A recent security audit indicates that peer-to-peer applications are allowed on the guest VLAN and employees may have been using the guest VLAN for this purpose. You deploy the configuration shown in the exhibit, but it does not stop the peer-to-peer traffic.

In this scenario, what must you do to implement the security policy?

A. Deploy storm control to block unknown unicast traffic
B. Use persistent MAC learning
C. Attach the filter to the VLAN
D. Implement 802.1X on the guest VLAN

Answer: C

NEW QUESTION # 70
Refer to Exhibit. Which two statements about the output shown in the exhibit are correct?
(Choose two.)

A. R3 advertises its loopback interface IP address.
B. A designated router is elected for each IS-IS interface.
C. R3 uses its loopback interface to establish an L2 IS-IS adjacency.
D. R3 cannot establish an L2 adjacency on the ge-0/0/2.0 interface.

Answer: A,D

Explanation:
The L column in this output identifies which IS-IS levels are active on each interface, using the standard bitmask where 1 represents Level 1 only and 3 represents both Level 1 and Level 2 combined. Interface ge-0/0/2.0 shows an L value of 1 and its Level 2 DR field explicitly reads Disabled, meaning Level 2 has not been enabled on that circuit at all; consequently no Level 2 adjacency can ever form there, regardless of what the neighboring router advertises, which confirms that statement as correct. The lo0.0 loopback interface shows Passive under both the Level 1 DR and Level 2 DR columns. A passive IS-IS interface is deliberately excluded from adjacency formation -- no IIH PDUs are sent or expected on it -- but its associated prefix is still injected into the router's own LSP and flooded throughout the area, which is precisely why loopbacks are configured as passive: to guarantee the router ID/loopback prefix is reachable network-wide without wasting adjacency overhead on an interface with no real neighbor. This confirms that R3 advertises its loopback address, while ruling out the claim that the loopback is used to form an adjacency. Regarding designated routers, all circuits shown here report 'Point to Point' rather than an actual DR system ID, because DR election in IS-IS is a construct exclusive to broadcast (LAN) circuits; point-to-point circuits never elect a DR, so the first statement is false.

NEW QUESTION # 71
You are asked to create a default route that will be advertised to your internal OSPF neighbors.
You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available. Which solution should you implement in this scenario?

A. Create a default static route with ISP1's address as the next hop while specifying the addresses for ISP2 and ISP3 as qualified next hops with a preference value of six or higher.
B. Create a default aggregated route.
C. Create a default static route with each neighbor address as the next hop.
D. Create a default generate route that includes an import policy to match BGP routes from ISP1 and assign a preference value of four or less.

Answer: A

NEW QUESTION # 72
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