View Full Juniper JN0-106 Exam Dumps and Practice Test Dumps.

 

Question 101

Which Junos command displays information about OSPF interfaces?

1. show ospf interface
2. show interfaces ospf
3. show ospf status
4. show protocol ospf interface

Correct Answer: 1

Explanation

The show ospf interface command provides operational information about interfaces participating in OSPF. Administrators can use this command to examine OSPF-related interface details, including areas, states, timers, and other protocol information depending on the platform and configuration. This is useful when troubleshooting OSPF adjacencies or verifying whether an interface is participating in the expected OSPF area. Interface-level OSPF information can be reviewed together with neighbor and routing information to determine whether the protocol is operating correctly and exchanging routing information as expected.

Question 102

Which routing protocol uses a link-state database to calculate shortest paths?

1. BGP
2. RIP
3. OSPF
4. ARP

Correct Answer: 3

Explanation

OSPF is a link-state routing protocol that maintains a link-state database representing the topology of the network. Routers exchange link-state information and use the Shortest Path First algorithm to calculate routes. This approach allows OSPF routers to build a consistent view of the network topology within an area. The protocol can also use areas to improve scalability. BGP uses path attributes and policies, while RIP uses a distance-vector approach. Understanding how OSPF operates helps administrators troubleshoot route calculation and neighbor relationships on Junos devices.

Question 103

Which BGP attribute is commonly used to influence the preferred outbound path within an autonomous system?

1. MED
2. Local Preference
3. Origin
4. AS Path

Correct Answer: 2

Explanation

Local Preference is a BGP attribute commonly used to influence outbound path selection within an autonomous system. A higher local-preference value is generally preferred when comparing eligible BGP routes. Because the attribute is distributed within the autonomous system, administrators can use it to influence which exit point is selected for outbound traffic. Local Preference is different from MED, which is commonly used to provide information about preferred entry points into an autonomous system. BGP policies can modify these attributes to achieve desired routing behavior.

Question 104

Which protocol is commonly used to exchange information about network reachability between autonomous systems?

1. OSPF
2. IS-IS
3. BGP
4. RIP

Correct Answer: 3

Explanation

Border Gateway Protocol, or BGP, is designed to exchange network reachability information between autonomous systems. It is the primary exterior gateway protocol used for Internet routing and is also widely used in service-provider and large enterprise environments. BGP uses path attributes and policies to determine how routes should be selected and advertised. Unlike an interior gateway protocol such as OSPF, BGP is designed to provide policy-based routing between separate administrative domains. Junos devices support BGP configuration and operational monitoring through dedicated routing commands.

Question 105

Which Junos command displays information about the system’s routing instances?

1. show routing-instances
2. show route instance
3. show configuration routing-instances
4. show system instances

Correct Answer: 1

Explanation

The show routing-instances command can be used to display operational information about routing instances configured on a Junos device. Routing instances allow a device to maintain separate routing tables and provide logical separation of routing information. They can be useful in environments such as VPNs, service-provider networks, and networks requiring multiple independent routing domains. Administrators can use routing-instance information when troubleshooting route isolation and verifying that traffic is associated with the correct logical routing environment.

Question 106

What is the primary purpose of a routing instance?

1. To provide separate logical routing tables
2. To increase interface speed
3. To replace Ethernet switching
4. To encrypt all network traffic

Correct Answer: 1

Explanation

A routing instance provides a logical routing environment within a Junos device. It can maintain a separate routing table from the default routing instance, allowing different sets of routes and forwarding decisions to coexist on the same physical device. Routing instances are useful in environments where traffic or customers need logical separation. They are widely used in service-provider networks and VPN architectures. Proper configuration allows administrators to isolate routing information while still using shared physical hardware and interfaces.

Question 107

Which Junos feature allows multiple independent routing tables on one device?

1. VLAN tagging
2. Routing instances
3. Interface groups
4. Firewall filters

Correct Answer: 2

Explanation

Routing instances allow a Junos device to maintain multiple independent routing tables. Each instance can have its own interfaces, routes, and routing protocols depending on the configuration and instance type. This provides logical separation without requiring separate physical routers for every routing domain. Routing instances are particularly useful for VPN services, customer separation, and specialized routing designs. Administrators can inspect the routes within a specific instance to verify that traffic is being handled according to the intended routing configuration.

Question 108

Which Junos command displays the route table for a particular routing instance?

1. show route instance
2. show route table
3. show route <routing-instance>
4. show routing-instance routes

Correct Answer: 3

Explanation

The show route command can be used with the appropriate routing-instance context or routing-table specification to examine routes associated with a particular routing instance. This is useful when a device contains multiple logical routing environments and the administrator needs to determine which routes are available within one of them. Examining the correct routing table is important because routes in one routing instance may not automatically appear in another. This separation is a fundamental characteristic of routing-instance-based network designs.

Question 109

Which Junos command displays firewall filter configuration?

1. show firewall filters
2. show configuration firewall
3. show firewall configuration
4. show filters firewall

Correct Answer: 2

Explanation

The show configuration firewall command displays firewall-related configuration statements from the Junos configuration hierarchy. Administrators can use it to review configured firewall filters and related settings before troubleshooting or modifying traffic-control policies. Firewall filters can contain match conditions and actions that determine how packets are handled. Reviewing the configuration helps confirm whether the intended terms, addresses, protocols, and actions are present. Operational verification can then be performed using appropriate counters or monitoring commands to determine whether traffic is matching the configured filter terms.

Question 110

What does a firewall filter term typically contain?

1. Match conditions and actions
2. Only interface descriptions
3. Only IP addresses
4. Routing protocol timers

Correct Answer: 1

Explanation

A Junos firewall filter term generally contains match conditions and actions. Match conditions identify packets based on characteristics such as source or destination addresses, protocols, ports, or other supported fields. Once a packet matches the specified conditions, the configured action determines how Junos should handle it. Actions can include accepting or discarding traffic and may also include functions such as counting or logging depending on the configuration. Multiple terms can be arranged to create a structured packet-filtering policy.

Question 111

Which action allows a packet that matches a firewall filter term to continue through the normal forwarding process?

1. discard
2. reject
3. accept
4. deny

Correct Answer: 3

Explanation

The accept action allows a packet matching a firewall filter term to continue through the applicable forwarding process. Firewall filters can be designed with multiple terms, each containing specific match conditions and actions. If traffic matches an accept term, the packet is permitted according to the filter’s processing rules. This is different from discard or reject actions, which prevent normal forwarding of matching traffic. Administrators should carefully order filter terms because Junos evaluates terms according to the filter’s processing behavior and the configured conditions.

Question 112

Which firewall filter action silently drops a matching packet?

1. accept
2. discard
3. count
4. log

Correct Answer: 2

Explanation

The discard action causes a matching packet to be dropped without forwarding it toward its destination. Unlike reject, which can generate a response to the source depending on the protocol and configuration, discard simply removes the packet from processing. This action can be used when traffic should be blocked without providing an explicit response. Administrators can combine discard with match conditions to control unwanted traffic based on addresses, protocols, ports, or other packet characteristics. Firewall-filter behavior should always be tested carefully before deployment in production networks.

Question 113

Which Junos feature can count packets matching a firewall filter term?

1. Counter
2. Meter
3. Tracker
4. Statistic

Correct Answer: 1

Explanation

A firewall filter counter can be used to count packets that match a particular filter term. Counters provide useful operational visibility because administrators can determine whether traffic is actually matching the conditions configured in a filter. This can be especially helpful when troubleshooting security or traffic-control policies. After applying a filter, administrators can inspect the associated counter information to determine whether expected traffic is being processed. Counters do not themselves determine whether traffic is allowed or blocked; the filter action controls the packet’s treatment.

Question 114

Which Junos feature can provide statistics about traffic matching a firewall filter?

1. Counter
2. Routing table
3. ARP cache
4. DNS cache

Correct Answer: 1

Explanation

A firewall filter counter provides statistics about traffic that matches a specific filter term. This can help administrators verify whether a filtering policy is receiving the traffic they expected. For example, a counter can indicate whether packets from a particular source or using a specific protocol are reaching a filter. Such information is useful when validating firewall-filter behavior and troubleshooting unexpected traffic. Counters can be examined through appropriate Junos operational commands after the filter has been applied and traffic has passed through the relevant processing point.

Question 115

Which Junos command can display firewall filter statistics?

1. show firewall
2. show firewall log
3. show firewall filter statistics
4. show firewall counters

Correct Answer: 4

Explanation

The show firewall counters command can be used to view firewall filter counter information on supported Junos platforms. Counters help administrators determine how much traffic has matched specific filter terms. This information is valuable when verifying that a filter is behaving as expected or troubleshooting why traffic is being accepted or blocked. If a counter remains at zero when matching traffic is expected, the administrator may need to review the filter attachment, match conditions, interface direction, or traffic characteristics. Operational statistics complement the configured filter definition.

Question 116

Which Junos feature can logically group interfaces for applying common configuration?

1. Interface ranges
2. Route groups
3. Port collections
4. Interface tables

Correct Answer: 1

Explanation

Interface ranges allow administrators to apply configuration statements to multiple interfaces efficiently. Instead of configuring each interface individually, an administrator can define a range and apply common settings to all interfaces included in that range. This can reduce repetitive configuration work and help maintain consistency across groups of ports. Interface ranges are particularly useful on devices with many similar interfaces. Administrators should still review the resulting configuration carefully to ensure that the intended interfaces were included and that no unique interface requirements were accidentally overwritten.

Question 117

Which Junos command is used to display the committed configuration differences between two configuration versions?

1. show | compare
2. compare configuration
3. show configuration difference
4. display compare

Correct Answer: 1

Explanation

The show | compare command is used in Junos configuration mode to display differences between the candidate configuration and the active configuration. This allows administrators to review changes before committing them. The output can show configuration statements that have been added, modified, or removed. Reviewing these differences is an important step before committing significant changes because it provides an opportunity to identify unintended modifications. The command is particularly useful in Junos because configuration changes are prepared in the candidate configuration before they become active.

Question 118

Which Junos command can be used to compare the candidate configuration with the active configuration?

1. compare active
2. show | compare
3. show active differences
4. display candidate changes

Correct Answer: 2

Explanation

The show | compare command provides a convenient way to review differences between the candidate configuration and the currently active configuration. It can show additions, deletions, and modifications that have been made but not yet committed. This helps administrators verify the intended changes before activating them. Reviewing configuration differences is an important operational practice because even a small unintended statement can affect routing, interfaces, security, or other services. The comparison output gives administrators a clear opportunity to correct mistakes before using commit.

Question 119

Which Junos command displays the configuration hierarchy in a more compact set-command format?

1. show | display set
2. show | display compact
3. show | set-format
4. display configuration set

Correct Answer: 1

Explanation

The show | display set command converts hierarchical Junos configuration output into set-style statements. This format presents configuration elements as individual commands that can be entered at the appropriate configuration level. It is useful when documenting configuration, recreating settings, or transferring selected configuration statements to another device. The traditional hierarchical format can be easier to read for understanding structure, while set-style output can be convenient for command-oriented configuration tasks. Administrators can choose the format that best suits the task they are performing.

Question 120

Which Junos command can display the configuration in XML format?

1. show | display xml
2. show | display json
3. show | display structured
4. show | display machine

Correct Answer: 1

Explanation

The show | display xml command displays Junos configuration information using XML formatting. XML provides a structured representation that can be useful for automation, scripting, and applications that need to process configuration data programmatically. Junos supports several display formats for configuration and operational information, allowing administrators and automation systems to work with data in different ways. While traditional hierarchical output is convenient for human review, structured formats such as XML can be valuable when configuration information needs to be consumed by software tools.