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JN0-351: Enterprise Routing and Switching, Specialist

Enterprise Routing and Switching, Specialist
Vendor:

Juniper

Enterprise Routing and Switching, Specialist Exam Questions: 65
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Exam Number: JN0-351

Exam Name: Enterprise Routing and Switching, Specialist

Length of test: 90 mins

Exam Format: Multiple-choice, Drag and Drop, and HOTSPOT questions.

Exam Language: English

Number of questions in the actual exam: 65 questions

Passing Score: 70%

Topics Covered:

1. Junos OS Fundamentals

2. Layer 2 Technologies

3. Layer 3 Routing

4. Network Addressing and Subnetting

5. High Availability (HA) and Redundancy

6. IP Services

7. Security Features

8. Monitoring and Troubleshooting

9. Junos Automation and Network Management

This study guide should help you understand what to expect on the JN0-351 exam and includes a summary of the topics the exam might cover and links to additional resources. The information and materials in this document should help you focus your studies as you prepare for the exam.

Related questions

What is the default keepalive time for BGP?

A.
10 seconds
A.
10 seconds
Answers
B.
60 seconds
B.
60 seconds
Answers
C.
30 seconds
C.
30 seconds
Answers
D.
90 seconds
D.
90 seconds
Answers
Suggested answer: B

Explanation:

The default keepalive time for BGP is60 seconds1.The keepalive time is the interval at which BGP sends keepalive messages to maintain the connection with its peer1.If the keepalive message is not received within the hold time, the connection is considered lost1.By default, the hold time is three times the keepalive time, which is180 seconds1.

asked 18/09/2024
Alexey Bokov
37 questions

Exhibit.

What is the management IP address of the device shown in the exhibit?

A.
10.210.20.233
A.
10.210.20.233
Answers
B.
172.23.12.100
B.
172.23.12.100
Answers
C.
128.0.0.1
C.
128.0.0.1
Answers
D.
172.23.11.10
D.
172.23.11.10
Answers
Suggested answer: B

Explanation:

The management IP address of a device is the IP address that is used to access the device for configuration and monitoring purposes. It is usually assigned to a dedicated management interface that is separate from the data interfaces. The management interface can be accessed via SSH, Telnet, HTTP, or other protocols.

In the exhibit, the list of interfaces and their statuses shows that the management interface is me0. This interface has an admin status of up, a protocol status of inet, a local address of 172.23.12.100/24, and a remote address of unspecified. This means that the me0 interface is active, has an IPv4 address assigned, and is not connected to another device.

Therefore, the management IP address of the device shown in the exhibit is 172.23.12.100.

: [Management Interfaces Overview] : [Displaying Interface Status Information]

asked 18/09/2024
Abbas Maleki
24 questions

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.)

A.
The routes displayed have traversed one or more autonomous systems.
A.
The routes displayed have traversed one or more autonomous systems.
Answers
B.
The output shows routes that were received prior to the application of any BGP import policies.
B.
The output shows routes that were received prior to the application of any BGP import policies.
Answers
C.
The output shows routes that are active and rejected by an import policy.
C.
The output shows routes that are active and rejected by an import policy.
Answers
D.
The routes displayed are being learned from an I BGP peer.
D.
The routes displayed are being learned from an I BGP peer.
Answers
Suggested answer: A, B

Explanation:

The output shown in the exhibit is the result of the command ''show ip bgp neighbor 10.36.1.4 received-routes'', which displays all received routes (both accepted and rejected) from the specified neighbor.

Option A is correct, because the routes displayed have traversed one or more autonomous systems. This can be seen from the AS_PATH attribute, which shows the sequence of AS numbers that the route has passed through. For example, the route 10.0.0.0/8 has an AS_PATH of 65001 65002, which means that it has traversed AS 65001 and AS 65002 before reaching the local router.

Option B is correct, because the output shows routes that were received prior to the application of any BGP import policies. This can be seen from the fact that some routes have a status code of ''r'', which means that they are rejected by an import policy. The ''received-routes'' keyword shows the routes coming from a given neighbor before the inbound policy has been applied. To see the routes after the inbound policy has been applied, the ''routes'' keyword should be used instead.

Option C is incorrect, because the output does not show routes that are active and rejected by an import policy. The status code of ''r'' means that the route is rejected by an import policy, but it does not mean that it is active. The status code of ''>'' means that the route is active and selected as the best path. None of the routes in the output have both ''>'' and ''r'' status codes.

Option D is incorrect, because the routes displayed are not being learned from an IBGP peer. An IBGP peer is a BGP neighbor that belongs to the same AS as the local router. The output shows that the neighbor 10.36.1.4 has a remote AS of 65001, which is different from the local AS of 65002. Therefore, the neighbor is an EBGP peer, not an IBGP peer.

asked 18/09/2024
Vigen Pillay
42 questions

Exhibit.

The ispi _ inet. 0 route table has currently no routes in it.

What will happen when you commit the configuration shown on the exhibit?

A.
The inet. 0 route table will be completely overwritten by the ispi . inet. 0 route table.
A.
The inet. 0 route table will be completely overwritten by the ispi . inet. 0 route table.
Answers
B.
The inet. 0 route table will be imported into the ispi . inet. 0 route table.
B.
The inet. 0 route table will be imported into the ispi . inet. 0 route table.
Answers
C.
The ISPI . inet. 0 route table will be completely overwritten by the inet. o route table.
C.
The ISPI . inet. 0 route table will be completely overwritten by the inet. o route table.
Answers
D.
The ISPI . inet. 0 route table will be imported into the inet. 0 route table.
D.
The ISPI . inet. 0 route table will be imported into the inet. 0 route table.
Answers
Suggested answer: B

Explanation:

The configuration shown in the exhibit is an example of a routing instance of type virtual-router.A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device1.A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table2.

The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table.

In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table. This means that the routes from inet.0 will be imported into ispi.inet.0.

Therefore, the correct answer is B. The inet.0 route table will be imported into the ispi.inet.0 route table.

1:Routing Instances Overview2:Virtual Routing Instances: [rib-group (Routing Options)]

asked 18/09/2024
Nicolas Pintrel
35 questions

Which statement about aggregate routes is correct?

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You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)

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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.)

A.
IBGP updates the next-hop attribute to ensure reachability within an AS.
A.
IBGP updates the next-hop attribute to ensure reachability within an AS.
Answers
B.
IBGP peers advertise routes received from EBGP peers to other IBGP peers.
B.
IBGP peers advertise routes received from EBGP peers to other IBGP peers.
Answers
C.
IBGP peers advertise routes received from IBGP peers to other IBGP peers.
C.
IBGP peers advertise routes received from IBGP peers to other IBGP peers.
Answers
D.
EBGP peers advertise routes received from IBGP peers to other EBGP peers.
D.
EBGP peers advertise routes received from IBGP peers to other EBGP peers.
Answers
Suggested answer: A, B

Explanation:

Ais correct because IBGP updates the next-hop attribute to ensure reachability within an AS. This is because the next-hop attribute is the IP address of the router that advertises the route to a BGP peer. If the next-hop attribute is not changed by IBGP, it would be the IP address of an external router, which may not be reachable by all routers within the AS.Therefore, IBGP updates the next-hop attribute to the IP address of the router that received the route from an EBGP peer1.

Bis correct because IBGP peers advertise routes received from EBGP peers to other IBGP peers. This is because BGP follows the rule of advertising only the best route to a destination, and EBGP routes have a higher preference than IBGP routes.Therefore, IBGP peers advertise routes learned from an EBGP peer to all BGP peers, including both EBGP and IBGP peers1.

asked 18/09/2024
Ramesh Kumar Patel
32 questions

Exhibit.

You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.

Referring to the exhibit, which two statements are correct? (Choose two.)

A.
Create static routes on the switches using the local vMX router's loopback interface for the next hop.
A.
Create static routes on the switches using the local vMX router's loopback interface for the next hop.
Answers
B.
Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type 5 LSAs.
B.
Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type 5 LSAs.
Answers
C.
Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.
C.
Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.
Answers
D.
Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.
D.
Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.
Answers
Suggested answer: C, D

Explanation:

The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.This can be resolved by redistributing the connected subnets into OSPF1.

Option C suggests to configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.This is correct because redistribution allows routes from one routing protocol to be communicated to another, and in this case, it allows the connected subnets to be advertised through OSPF1.

Option D suggests enabling the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.This is also correct because in OSPF, a passive interface is an interface that belongs to the OSPF router, but does not send OSPF Hello packets1.It's typically used on an interface that you don't want to use for OSPF adjacencies, but you still want to advertise its IP address1. Therefore, enabling passive interface can help in advertising the Dallas and Denver subnets.

asked 18/09/2024
Waleed Bahadaq
40 questions

Exhibit

Which command displays the output shown in the exhibit?

A.
show route forwarding-table
A.
show route forwarding-table
Answers
B.
show ethernet-switching table
B.
show ethernet-switching table
Answers
C.
show ethernet---switching table extensive
C.
show ethernet---switching table extensive
Answers
D.
show route forwarding---table family ethernet-switching
D.
show route forwarding---table family ethernet-switching
Answers
Suggested answer: B

Explanation:

The output shown in the exhibit is a brief display of the Ethernet switching table, which shows the learned Layer 2 MAC addresses for each VLAN and interface1.

The commandshow ethernet-switching tabledisplays the Ethernet switching table with brief information, such as the destination MAC address, the VLAN name, the forwarding state, and the interface name1.

The commandshow route forwarding-tabledisplays the routing table information for each protocol family, such as inet, inet6, mpls, iso, and so on2. It does not show the Ethernet switching table or the MAC addresses.

The commandshow ethernet-switching table extensivedisplays the Ethernet switching table with extensive information, such as the destination MAC address, the VLAN name, the forwarding state, the interface name, the VLAN index, and the tag type1. It shows more details than the brief output shown in the exhibit.

The commandshow route forwarding-table family ethernet-switchingdisplays the routing table information for the ethernet-switching protocol family, which shows the destination MAC address, the next-hop MAC address, and the interface name3. It does not show the VLAN name or the forwarding state.

asked 18/09/2024
Sacha CONTI
43 questions

Which three protocols support BFD? (Choose three.)

A.
RSTP
A.
RSTP
Answers
B.
BGP
B.
BGP
Answers
C.
OSPF
C.
OSPF
Answers
D.
LACP
D.
LACP
Answers
E.
FTP
E.
FTP
Answers
Suggested answer: B, C, D

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.

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]

asked 18/09/2024
Eric Zarghami
51 questions