Real JN0-351 Dumps – Juniper Correct Answers updated on 2023 [Q33-Q54]

QUESTION 33
Exhibit.

Why is this OSPF adjacency remaining in this state?

A subnet mask mismatch exists between the OSPF neighbors.

An MTU mismatch exists between the OSPF neighbors.

A hello interval mismatch exists between the OSPF neighbors.

An area ID mismatch exists between the OSPF neighbors

QUESTION 34
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

root

backup

alternate

disabled

designated

QUESTION 35
What are two characteristics of RSTP alternate ports? (Choose two.)

RSTP alternate ports provide an alternate higher cost path to the root bridge.

RSTP alternate ports provide an alternate lower cost path to the root bridge.

RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.

RSTP alternate ports are active ports used to forward frames toward the root bridge.

QUESTION 36
What are two characteristics of RSTP alternate ports? (Choose two.)

RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.

RSTP alternate ports provide an alternate lower cost path to the root bridge.

RSTP alternate ports provide an alternate higher cost path to the root bridge.

RSTP alternate ports are active ports used to forward frames toward the root bridge.

QUESTION 37
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

aggregate route

static route using the resolve feature

generate route

static route using qualified next hops

QUESTION 38
Exhibit

Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)

On R1, enable Level 1 on the ge-0/0/1 interface.

On R3 disable Level 2 on the ge-0/0/4 interface.

On R1, disable Level 2 on the ge-0/0/1 interface.

On R3 enable Level 1 on the ge-0/0/4 interface

QUESTION 39
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

1496 bytes

1480 bytes

1500 bytes

1476 bytes

QUESTION 40
Refer to the exhibit.

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

The state is normal for a DR neighbor.

The state is normal for a DRother neighbor

An MTU mismatch exists between the OSPF neighbors.

An area ID mismatch exists between the OSPF neighbors

QUESTION 41
You want to ensure traffic is routed through a GRE tunnel.
In this scenario, which two statements will satisfy this requirement? (Choose two.)

Tunnel endpoints must have a route that directs traffic into the tunnel.

All intermediary devices must have a route to the tunnel endpoints.

Keepalives must be used on stateless tunneling protocols.

BFD must be used on the stateless tunneling protocols.

QUESTION 42
Which statement is correct about the IS-IS ISO NET address?

An ISO NET address defined with a system ID of 0000.0000.0000 must be selected as the DIS.

An ISO NET address must be unique for each device in the network.

You can only define a single ISO NET address per device.

The Area ID must match on all devices within a L2 area.

QUESTION 43
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)

AS path

MED

next hop

community

QUESTION 44
Exhibit

Referring to the exhibit, which statement is correct?

The local device is using a bridge priority of 4k.

The root bridge is using a bridge priority of 4k.

The root bridge has not been elected for this RSTP topology.

The local device is the root bridge for this RSTP topology.

QUESTION 45
You need to configure a LAG between your switches. In this scenario, which two statements are correct?
(Choose two.)

Duplex and speed settings are not required to match on both participating devices.

Duplex and speed settings are required to match on both participating devices.

Member links are not required to be contiguous ports.

Member links are required to be contiguous ports.

QUESTION 46
Exhibit

You are a network operator troubleshooting BGP connectivity.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

Peer 10.32.1.2 is configured for AS 63645.

The BGP session is not established.

The R1 is configured for AS 65400.

The routers are exchanging IPv4 routes.

QUESTION 47
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?

voice VLAN

native VLAN

MAC limiting

DHCP snooping

QUESTION 48
You are attempting to configure the initial two aggregated Ethernet interfaces on a router but there are no aggregated Ethernet interfaces available.
In this scenario, which configuration will enable these interfaces on this router?

QUESTION 49
Which two statements are correct about tunnels? (Choose two.)

BFD cannot be used to monitor tunnels.

Tunnel endpoints must have a valid route to the remote tunnel endpoint.

IP-IP tunnels are stateful.

Tunnels add additional overhead to packet size.

Explanation
A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly used to secure data communications between two networks or to connect two networks that use different protocols.
Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network. This means that they must have a valid route to the IP address of the remote endpoint1.
Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets. This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and trailer of the surrounding packet add extra bytes to the packet size, which is called overhead. Overhead can reduce the efficiency and performance of a network, as it consumes more bandwidth and processing power2.
Option A is incorrect, because BFD can be used to monitor tunnels. BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery.
BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.
Option C is incorrect, because IP-IP tunnels are stateless. IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels are stateless, which means that they do not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do not provide any error detection or recovery mechanisms.
References:
1: What is Tunneling? | Tunneling in Networking 2: What Is Tunnel In Networking, Its Types, And Its Benefits? : [Configuring Bidirectional Forwarding Detection] : [IP-IP Tunneling]

QUESTION 50
Exhibit

Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?

The BFD liveness is set too low.

The BFD liveness must be configured on the BGP neighbor.

The BFD liveness must be configured on the BGP group.

The BFD liveness is set too high.

QUESTION 51
Exhibit

You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?

For GRE tunnels, the OAM protocol requires that the BFD protocols also be used.

The “event link-adjacency-loss” option must be set.

LLDP needs to be removed from the gr-1/1/10.1 interface.

The hold-time value must be two times the keepalive-time value

Explanation
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down1.
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive-time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down2.
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel2. This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives3. Option B is incorrect, because the “event link-adjacency-loss” option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down4. Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels5.
References:
1: Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2: keepalive | Junos OS | Juniper Networks 3: Configuring Bidirectional Forwarding Detection 4: event link-adjacency-loss | Junos OS | Juniper Networks 5: Understanding Link Layer Discovery Protocol

QUESTION 52
Exhibit

Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device Which BGP attribute would you use?

MED

next-hop

local preference

origin

QUESTION 53
What are two reasons for creating multiple areas in OSPF? (Choose two.)

to reduce the convergence time

to increase the number of adjacencies in the backbone

to increase the size of the LSDB

to reduce LSA flooding across the network

QUESTION 54
Exhibit

What does the * indicate in the output shown in the exhibit?

The switch ports have a router attached.

The interface is down.

The interface is active.

All interfaces have elected a root bridge.

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Real JN0-351 Dumps – Juniper Correct Answers updated on 2023 [Q33-Q54]

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