JN0-351 Online Practice Questions and Answers

Questions 4

Click the Exhibit button.

Referring to the exhibit, Router 1 learns about Route X.

Which statement is correct about Route X when using the default BGP advertisement rules?

A. R1 will not advertise this route to any peers.

B. R3 will not advertise this route to R4 or R5 without an explicit policy.

C. R4 and R5 will not advertise this route to each other.

D. R2 will not advertise this route to R3 without an explicit policy.

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Questions 5

Which two statements about a unified ISSU are correct? (Choose two.)

A. It requires that Bidirectional Forwarding Detection be disabled.

B. It requires that graceful Routing Engine switchover be enabled.

C. It is only supported on platforms with redundant control planes.

D. It is only supported on platforms with redundant power supplies.

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Questions 6

Click the Exhibit button.

Referring to the exhibit, which statement is correct?

A. The device is the root bridge?

B. The spanning tree session has timed out.

C. The local bridge priority is set to 8k.

D. The bridge priority on the root device is set to 8k.

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Questions 7

Click the Exhibit button.

You are trying to form an IS-IS adjacency between Router A and Router B, but the IS-IS adjacency will not form between the two routers.

Referring to the exhibit, which action would solve this problem?

A. Enable level 1 IS-IS routing on Router A.

B. Enable IS-IS wide metrics on Router A.

C. Enable level 2 IS-IS routing on Router B.

D. Enable IS-IS wide metrics on Router B.

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Questions 8

Which two statements about Martian addresses are correct? (Choose two.)

A. Martian addresses require a route prefix match type.

B. Martian addresses are not installed in the routing table by default.

C. Martian addresses can only be applied to the inet.0 routing table.

D. Martian addresses are installed in the routing table by default.

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Questions 9

What types of authentication are supported in Junos for OSPF?

A. Simple password

B. MD5 checksum

C. Hitless key chain of MD5 keys/checksums

D. All of the above

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Questions 10

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

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Questions 11

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.)

A. IPsec

B. anycast

C. IPv6

D. multicast

E. IPv4

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Questions 12

Which three protocols support BFD? (Choose three.)

A. RSTP

B. BGP

C. OSPF

D. LACP

E. FTP

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Correct Answer: BCD

Explanation: 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. According to the Juniper Networks documentation, the following protocols support BFD on Junos OS devices1:

BGP: BFD can be used to monitor the connectivity between BGP peers and trigger a session reset if a failure is detected. BFD can be configured for both internal and external BGP sessions, as well as for IPv4 and IPv6 address families2.

OSPF: BFD can be used to monitor the connectivity between OSPF neighbors and trigger a state change if a failure is detected. BFD can be configured for both OSPFv2 and OSPFv3 protocols, as well as for point-to-point and broadcast

network types3.

LACP: BFD can be used to monitor the connectivity between LACP members and trigger a link state change if a failure is detected. BFD can be configured for both active and passive LACP modes, as well as for static and dynamic LAGs4.

Other protocols that support BFD on Junos OS devices are:

IS-IS: BFD can be used to monitor the connectivity between IS-IS neighbors and trigger a state change if a failure is detected. BFD can be configured for both level 1 and level 2 IS-IS adjacencies, as well as for point-to-point and broadcast

network types.

RIP: BFD can be used to monitor the connectivity between RIP neighbors and trigger a route update if a failure is detected. BFD can be configured for both RIP version 1 and version 2 protocols, as well as for IPv4 and IPv6 address families.

VRRP: BFD can be used to monitor the connectivity between VRRP routers and trigger a priority change if a failure is detected. BFD can be configured for both VRRP version 2 and version 3 protocols, as well as for IPv4 and IPv6 address

families.

The protocols that do not support BFD on Junos OS devices are:

RSTP: RSTP is a spanning tree protocol that provides loop prevention and rapid convergence in layer 2 networks. RSTP does not use BFD to detect link failures, but relies on its own hello mechanism that sends BPDU packets every 2

seconds by default.

FTP: FTP is an application layer protocol that is used to transfer files between hosts over a TCP connection. FTP does not use BFD to detect connection failures, but relies on TCP's own retransmission and timeout mechanisms.

References:

1: [Configuring Bidirectional Forwarding Detection] 2: [Configuring Bidirectional Forwarding Detection for BGP] 3: [Configuring Bidirectional Forwarding Detection for OSPF] 4:

[Configuring Bidirectional Forwarding Detection for Link Aggregation Control Protocol] :

[Configuring Bidirectional Forwarding Detection for IS-IS] : [Configuring Bidirectional Forwarding Detection for RIP] : [Configuring Bidirectional Forwarding Detection for VRRP] :

[Understanding Rapid Spanning Tree Protocol] : [Understanding FTP]

Questions 13

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

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

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

C. Member links are not required to be contiguous ports.

D. Member links are required to be contiguous ports.

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Exam Code: JN0-351

Exam Name: Enterprise Routing and Switching Specialist (JNCIS-ENT)

Last Update: Nov 11, 2024

Questions: 175