JN0-351 DUMPS & NEW JN0-351 PRACTICE MATERIALS

JN0-351 Dumps & New JN0-351 Practice Materials

JN0-351 Dumps & New JN0-351 Practice Materials

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q15-Q20):

NEW QUESTION # 15
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. voice VLAN
  • B. MAC limiting
  • C. DHCP snooping
  • D. native VLAN

Answer: A

Explanation:
Explanation
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.


NEW QUESTION # 16
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

  • A. Layer 2 control traffic is permitted on the secondary link.
  • B. Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.
  • C. If the active link fails, then the secondary link automatically takes over.
  • D. Redundant trunk groups load balance traffic across two designated uplink interfaces.

Answer: A,C

Explanation:
C is correct because Layer 2 control traffic is permitted on the secondary link of a redundant trunk group (RTG) on EX Series switches. Layer 2 control traffic includes protocols such as LLDP, LACP, and STP, which are used to exchange information and coordinate actions between switches1. According to the Juniper Networks documentation2, Layer 2 control traffic is allowed to pass through both the active and the secondary links of an RTG, but data traffic is only forwarded through the active link. This allows the switches to maintain their Layer 2 adjacencies and monitor the link status on both links.
D is correct because if the active link fails, then the secondary link automatically takes over in an RTG on EX Series switches. An RTG consists of two trunk links: an active or primary link, and a secondary or backup link2. The active link is used to forward data traffic, while the secondary link is in standby mode. If the active link fails or becomes unavailable, the secondary link immediately transitions to a forwarding state and takes over the data traffic without waiting for normal STP convergence2. This provides fast recovery and redundancy for the network.


NEW QUESTION # 17
What is a purpose of using a spanning tree protocol?

  • A. to look up MAC addresses
  • B. to route IP packets
  • C. to eliminate broadcast storms
  • D. to tunnel Ethernet frames

Answer: C

Explanation:
A broadcast storm is a network condition where a large number of broadcast packets are sent and received by multiple devices, causing congestion and performance degradation1. A broadcast storm can occur when there are loops in the network topology, meaning that there are multiple paths between two devices2.
A spanning tree protocol is a network protocol that prevents loops from being formed when switches or bridges are interconnected via multiple paths. It does this by creating a logical tree structure that spans all the devices in the network, and disabling or blocking the links that are not part of the tree, leaving a single active path between any two devices3.
By eliminating loops, a spanning tree protocol also eliminates broadcast storms, as broadcast packets will not be forwarded endlessly along the looped paths. Instead, broadcast packets will be sent only along the tree structure, reaching each device once and avoiding congestion3.


NEW QUESTION # 18
Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)

  • A. When an OSPF adjacency is established.
  • B. When a static route to the 224.0.0.5 address is created.
  • C. When a static route to the 224.0.0.6 address is created.
  • D. When an interface has the OSPF passive option enabled.

Answer: A,B

Explanation:
A is correct because when an OSPF adjacency is established, a router will advertise a connected network to OSPF neighbors. An OSPF adjacency is a logical relationship between two routers that agree to exchange routing information using the OSPF protocol1. To establish an OSPF adjacency, the routers must be in the same area, have compatible parameters, and exchange hello packets1. Once an OSPF adjacency is formed, the routers will exchange database description (DBD) packets, which contain summaries of their link-state databases (LSDBs)1. The LSDBs include information about the connected networks and their costs2. Therefore, when an OSPF adjacency is established, a router will advertise a connected network to OSPF neighbors through DBD packets.
D is correct because when a static route to the 224.0.0.5 address is created, a router will advertise a connected network to OSPF neighbors. The 224.0.0.5 address is the multicast address for all OSPF routers3. A static route to this address can be used to send OSPF hello packets to all OSPF neighbors on a network segment3. This can be useful when the network segment does not support multicast or when the router does not have an IP address on the segment3. When a static route to the 224.0.0.5 address is created, the router will send hello packets to this address and establish OSPF adjacencies with other routers on the segment3. As explained above, once an OSPF adjacency is formed, the router will advertise a connected network to OSPF neighbors through DBD packets.


NEW QUESTION # 19
Refer to the exhibit.

Referring to the output shown in the exhibit, which statement is correct?

  • A. An area ID mismatch exists between the OSPF neighbors
  • B. The state is normal for a DRother neighbor
  • C. The state is normal for a DR neighbor.
  • D. An MTU mismatch exists between the OSPF neighbors.

Answer: B

Explanation:
Explanation
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers1. The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers1. This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network1. These neighbors are often referred to as "DRothers"1. Therefore, option B is correct.


NEW QUESTION # 20
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