JN0-106 Junos Configuration Basics Practice Test 2 — 15 Questions

Question 1

Which TWO statements correctly describe Junos configuration hierarchy and management?

Accepted Answer

The 'load merge' command imports configuration from a file and merges it with the current candidate configuration.. The 'load merge' command in Junos imports configuration data from a file and merges it with the current candidate configuration, preserving existing statements unless explicitly overridden. This allows incremental changes without replacing the entire configuration, which is essential for efficient network operations.

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The 'deactivate' command permanently removes a configuration statement from the candidate.

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The 'set' command in configuration mode directly modifies the active configuration.

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In operational mode, the 'show' command displays the candidate configuration.

Question 2

Refer to the exhibit. What is the purpose of the 'family inet6' configuration on interface ge-0/0/0?

Accepted Answer

To assign a global unicast IPv6 address to the interface.. The 'family inet6' configuration on interface ge-0/0/0 enables IPv6 processing on that interface. Within the 'family inet6' hierarchy, you can assign a global unicast IPv6 address using the 'address' statement. Without 'family inet6', the interface cannot process IPv6 traffic or hold an IPv6 address, making option B correct.

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To enable both IPv4 and IPv6 on the interface.

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To enable IPv6 ARP on the interface.

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To assign a link-local IPv6 address to the interface.

Question 3

Order the steps to configure a VLAN on an EX Series switch running Junos.

Accepted Answer

Create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then commit, then verify. VLANs are created under 'vlans' hierarchy, then interfaces are assigned as access ports. Commit and verify.

Answer

Configure interface as access port and assign VLAN, then create VLAN under 'vlans' hierarchy, then commit, then verify

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Create VLAN under 'vlans' hierarchy, then commit, then configure interface as access port and assign VLAN, then verify

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Commit, then create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then verify

Question 4

Order the steps to configure a BGP peering session in Junos.

Accepted Answer

Step 1: Configure the autonomous system (AS) number on the router. Step 2: Create a BGP group and specify the peer AS. Step 3: Define the neighbor IP address in the BGP group. Step 4: Commit the configuration and verify using 'show bgp summary'.. BGP requires an AS number, group configuration, and neighbor definition. Verify with 'show bgp summary'.

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Step 1: Create a BGP group and specify the peer AS. Step 2: Configure the autonomous system (AS) number on the router. Step 3: Define the neighbor IP address in the BGP group. Step 4: Commit the configuration and verify using 'show bgp summary'.

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Step 1: Configure the autonomous system (AS) number on the router. Step 2: Define the neighbor IP address in the BGP group. Step 3: Create a BGP group and specify the peer AS. Step 4: Commit the configuration and verify using 'show bgp summary'.

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Step 1: Configure the autonomous system (AS) number on the router. Step 2: Create a BGP group and specify the peer AS. Step 3: Commit the configuration and verify using 'show bgp summary'. Step 4: Define the neighbor IP address in the BGP group.

Question 5

Match each Junos configuration mode command to its purpose.

Accepted Answer

set: Modifies a configuration parameter. In Junos configuration mode, 'set' modifies parameters, 'edit' changes the hierarchy level, 'delete' removes elements, and 'rename' renames identifiers. Common confusions involve swapping purposes of 'set' and 'delete', or 'rename' and 'edit'.

Answer

set: Removes a configuration element

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rename: Navigates to a specific configuration hierarchy level

Question 6

Match each Junos software process to its role.

Accepted Answer

rpd: Handles routing protocols such as OSPF and BGP.. In Junos, each daemon has a specific role: rpd manages routing protocols, mgd provides CLI/API management, dcd controls physical interfaces, and chassisd monitors chassis hardware. Confusing these roles is common.

Answer

rpd: Monitors chassis hardware.

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mgd: Handles routing protocols.

Question 7

An administrator makes changes to the candidate configuration and wants to automatically revert to the previous configuration if the changes cause a loss of connectivity. Which method should be used?

Accepted Answer

Use the 'commit confirmed' command.. The 'commit confirmed' command is the correct method because it allows an administrator to commit a candidate configuration with a confirmation timeout (default 10 minutes). If connectivity is lost and the commit is not confirmed within the timeout, Junos automatically reverts to the previous configuration, ensuring the device remains reachable.

Answer

Use the 'commit check' command.

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Use the 'commit synchronize' command.

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Use the 'rollback' command.

Question 8

An administrator wants to apply the same BGP configuration to all interfaces whose names start with 'ge-'. Which approach would dynamically match these interfaces?

Accepted Answer

Define a configuration group and use apply-groups with [edit interfaces ge-*]. In Junos, you can use a configuration group that defines interface stanzas with wildcard names, and then apply that group globally. The wildcard in the group definition dynamically matches all interfaces whose names start with 'ge-'. Option C is incorrect because 'apply-path' is used for referencing paths in the configuration, not for dynamically matching interface names with regular expressions.

Answer

Create a firewall filter that matches ge- interfaces

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Use apply-path referencing a regular expression in the configuration group

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Use an interface-range named 'ge-interfaces' listing all ge- interfaces

Question 9

Under what circumstance would the 'deactivate' command be useful in Junos configuration?

Accepted Answer

To temporarily disable a configuration statement without removing it from the configuration. The 'deactivate' command in Junos temporarily disables a configuration statement without removing it from the configuration. This is useful for testing changes or troubleshooting because the deactivated statement remains in the configuration but is ignored by the commit operation, allowing easy reactivation with the 'activate' command.

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To delete a configuration statement after commit

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To permanently remove a configuration statement

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To mark a statement as inactive while keeping it in the active configuration

Question 10

An administrator needs to change a portion of the configuration by matching a pattern and replacing it with new text. Which Junos configuration mode command should be used?

Accepted Answer

replace pattern. The 'replace pattern' command in Junos configuration mode allows an administrator to search for a specific text pattern using regular expressions and replace it with new text. This is the correct command for pattern-based substitution within the configuration hierarchy, as it directly matches and replaces text without requiring manual deletion or re-entry.

Answer

rename

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copy

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set replace pattern

Question 11

An engineer needs to load a full configuration from a text file onto a Junos device, replacing the entire candidate configuration. Which command should be used?

Accepted Answer

load override /path/to/config.txt. The 'load override' command replaces the entire candidate configuration with the contents of the specified text file, discarding any existing candidate changes. This is the correct choice because the engineer explicitly needs to replace the full configuration, not merge or patch it.

Answer

load set /path/to/config.txt

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load patch /path/to/config.txt

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load merge /path/to/config.txt

Question 12

Which TWO statements about configuration groups are correct? (Choose two.)

Accepted Answer

Multiple groups can be applied, and the order of application determines priority.. When multiple configuration groups are applied, the order of the 'apply-groups' statements determines the priority: the last group listed has the highest priority and overrides conflicting settings from earlier groups. This allows administrators to layer configuration changes predictably, with more specific groups overriding more general ones.

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The 'apply-groups' statement is only valid at the top level of the configuration.

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Configuration groups can only contain interface-related configuration.

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The 'apply-groups' statement can be used to apply only specific statements from a group.

Question 13

Which THREE statements about the commit operation are correct? (Choose three.)

Accepted Answer

The 'commit check' command validates the syntax of the candidate configuration without activating it.. The 'commit check' command validates the syntax and semantics of the candidate configuration without activating it. This allows an administrator to verify that the configuration is error-free before making it active, preventing potential misconfigurations from disrupting network operations.

Answer

The candidate configuration is stored in a file named 'juniper.conf' on the flash drive.

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A commit operation automatically saves the rescue configuration.

Question 14

Which TWO statements about the rescue configuration are correct? (Choose two.)

Accepted Answer

The rescue configuration is designed to provide a method of last-resort recovery.. The rescue configuration is explicitly designed to provide a method of last-resort recovery. It allows an administrator to save a known-good configuration that can be loaded even if the active configuration becomes corrupted or inaccessible, ensuring the device can be brought back to a functional state.

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The rescue configuration is automatically saved after every commit.

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The 'rollback rescue' command loads the factory-default configuration.

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The rescue configuration can be used to restore only a subset of the configuration.

Question 15

Refer to the exhibit. If the administrator now enters the command 'delete interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24' and then commits, what will be the result?

Accepted Answer

Only the address 192.168.1.1/24 will be removed, and 192.168.1.2/24 will remain.. The 'delete' command in Junos is hierarchical and targets the exact configuration hierarchy specified. In this case, the command specifies 'address 192.168.1.1/24' under 'family inet', so only that specific address is removed. The other address (192.168.1.2/24) remains because it is a separate leaf under the same 'address' statement and is not affected by the deletion.

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The commit will fail due to an attempt to delete a non-existent address.

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The entire unit 0 will be deleted.

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Both addresses will be removed from the configuration.