[Q24-Q45] JN0-351 100% Guarantee Download JN0-351 Exam PDF Q&A [Dec 24, 2023]

Q24. 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.

Q25. 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

Q26. Exhibit.

You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

The routes displayed have traversed one or more autonomous systems.

The output shows routes that were received prior to the application of any BGP import policies.

The output shows routes that are active and rejected by an import policy.

The routes displayed are being learned from an I BGP peer.

Q27. Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.

Redundant trunk groups load balance traffic across two designated uplink interfaces.

Layer 2 control traffic is permitted on the secondary link.

If the active link fails, then the secondary link automatically takes over.

Q28. 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.

Q29. Exhibit.

You want to enable redundancy for the EBGP peering between the two routers shown in the exhibit. Which three actions will you perform in this scenario? (Choose three.)

Configure BGP multihop.

Configure loopback interface peering.

Configure routes for the peer loopback interface IP addresses.

Configure an MD5 peer authentication.

Configure a cluster ID.

Q30. 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?

ISP1

ISP 3

ISP 4

ISP 2

Q31. What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

1496 bytes

1480 bytes

1500 bytes

1476 bytes

Q32. 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.

Q33. A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

IPsec

anycast

IPv6

multicast

IPv4

Q34. Exhibit

Which command displays the output shown in the exhibit?

show route forwarding-table

show ethernet-switching table

show ethernet-switching table extensive

show route forwarding-table family ethernet-switching

Q35. Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Redundant trunk groups load-balance traffic across two designated uplink interfaces.

If the active link fails, then the secondary link automatically takes over.

Layer 2 control traffic is permitted on the secondary link

Redundant trunk groups must be connected to the same aggregation switch.

Q36. Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)

You can deploy only stateless firewall filters on an EX Series switch.

You can only apply firewall filters to Layer 2 traffic on an EX Series switch.

You can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.

You can deploy both stateless and stateful firewall filters on an EX Series switch.

Q37. You implemented the MAC address limit feature with the shutdown action on all interfaces on your switch.
In this scenario, which statement is correct when a violation occurs?

By default, you must manually clear the violation for the interface to send and receive traffic again.

By default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.

By default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.

By default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.

Q38. Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems?
(Choose two.)

EBGP routers will append their AS number when advertising routes to their neighbors.

EBGP routers will only accept routes that contain their own AS number in the AS_PATH.

EBGP routers will drop routes that contain their own AS number in the AS_PATH

EBGP routers will prepend their AS number when advertising routes to their neighbors

Q39. You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network.
What two statements are correct in this scenario? (Choose two.)

IBGP updates the next-hop attribute to ensure reachability within an AS.

IBGP peers advertise routes received from EBGP peers to other IBGP peers.

IBGP peers advertise routes received from IBGP peers to other IBGP peers.

EBGP peers advertise routes received from IBGP peers to other EBGP peers.

Q40. Which statement is correct about graceful Routing Engine switchover (GRES)?

The PFE restarts and the kernel and interface information is lost.

GRES has a helper mode and a restarting mode.

When combined with NSR, routing is preserved and the new master RE does not restart rpd.

With no other high availability features enabled, routing is preserved and the new master RE does not restart rpd.

Q41. You are an operator for a network running 1S-IS. Two routers are failing to form an adjacency. What are two reasons for this problem? (Choose two.)

There are mismatched router IDs on the L2 routers.

There is no configured ISO address on any IS-IS interface.

There is a mismatched area ID between the L2 routers.

The family iso configuration is missing from the adjacency interface.

Q42. Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

blocking

flooding

learning

listening

Q43. 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

Q44. Exhibit

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