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Question 41

Which Junos OS command displays detailed information about the routing table and its entries?

1. show interfaces detail
2. show route detail
3. show chassis detail
4. show system detail

Correct Answer: 2

Explanation

The show route detail command provides detailed information about routes in the Junos routing table. The output can include information such as route preferences, next hops, protocol sources, and other attributes associated with individual routes. This level of detail is useful when troubleshooting routing behavior or determining why a particular route was selected. Administrators can use more specific versions of the command to investigate individual destinations. Understanding detailed routing output helps network engineers verify how Junos learned a route and how that route will influence packet forwarding decisions.

Question 42

Which Junos command displays information about the software version and device model?

1. show version
2. show route
3. show interfaces terse
4. show system users

Correct Answer: 1

Explanation

The show version command provides important information about the Junos software and the device platform. The output typically includes the Junos OS release version along with platform-related details. Administrators can use this information when troubleshooting software compatibility, checking whether a device meets a particular software requirement, or preparing for an upgrade. Knowing the exact operating-system version is important because available features and command behavior can differ between Junos releases. This command is commonly one of the first commands used when gathering basic information about an unfamiliar Juniper device.

Question 43

Which command is used to display the current system date and time on a Junos device?

1. show clock
2. show system time
3. show system uptime
4. show date

Correct Answer: 1

Explanation

The show clock command displays the current date and time configured on a Junos device. Accurate system time is important for network operations because timestamps are used in logs, troubleshooting, monitoring, and security-related activities. If a device has an incorrect clock, comparing events across multiple systems can become difficult. Administrators can use the displayed time to verify whether the device clock is operating as expected. Time synchronization can also be configured through services such as NTP when consistent time is required across multiple network devices.

Question 44

Which command can display the current active configuration from operational mode?

1. show active
2. show configuration
3. show running
4. show config-active

Correct Answer: 2

Explanation

The show configuration command displays the active configuration when executed from operational mode. Junos uses a hierarchical configuration structure, allowing administrators to review settings related to interfaces, routing, security, system services, and other functions. Reviewing the active configuration is useful before troubleshooting or making additional changes. Administrators can also use more specific forms of the command to display selected configuration sections. This command is different from simply viewing operational information because it focuses on the configuration statements that define how the Junos device is configured.

Question 45

Which Junos command can be used to terminate a command-line session?

1. quit
2. close
3. exit
4. stop

Correct Answer: 3

Explanation

The exit command is commonly used to leave the current Junos CLI mode or terminate a command-line session when appropriate. In configuration mode, exit can move the administrator back toward operational mode depending on the current hierarchy level. When used from the appropriate context, it can also end the CLI session. Understanding basic CLI navigation commands is important because Junos separates operational and configuration environments. Commands such as exit, up, and top help administrators move through these environments without changing the device configuration.

Question 46

Which command moves the administrator one level higher in the Junos configuration hierarchy?

1. back
2. up
3. higher
4. parent

Correct Answer: 2

Explanation

The up command moves an administrator one level higher in the Junos configuration hierarchy. Junos uses a structured hierarchy in which configuration statements are organized into related levels. When working inside a specific section, such as an interface or routing protocol configuration, an administrator can use up to return to the parent level. This is useful when navigating configurations without leaving configuration mode entirely. The top command can be used when the administrator needs to return directly to the top level of the configuration hierarchy.

Question 47

Which command returns the administrator directly to the top level of the Junos configuration hierarchy?

1. root
2. home
3. top
4. main

Correct Answer: 3

Explanation

The top command moves the administrator directly to the top level of the Junos configuration hierarchy. This is useful when the administrator has navigated several levels deep into the configuration and needs to return to the starting point quickly. Instead of repeatedly using the up command, top provides a direct way to return to the root of the configuration hierarchy. Once at the top level, the administrator can use edit, set, delete, or other configuration commands as required. Efficient hierarchy navigation helps reduce configuration mistakes.

Question 48

Which command displays interface information in a compact format?

1. show interfaces brief
2. show interfaces terse
3. show interfaces compact
4. show interfaces summary

Correct Answer: 2

Explanation

The show interfaces terse command displays interface information in a concise format. It is particularly useful for quickly reviewing the status of multiple interfaces on a Junos device. The output provides essential information without the extensive statistics and details produced by the standard show interfaces command. Administrators often use the terse command during troubleshooting to identify interfaces that are administratively disabled, physically down, or otherwise not operating as expected. After identifying a problem interface, they can use more detailed interface commands to investigate the specific condition.

Question 49

Which interface status indicates that an interface is administratively disabled?

1. Down
2. Disabled
3. Dormant
4. Inactive

Correct Answer: 2

Explanation

An interface that is administratively disabled has been intentionally configured so that it does not operate normally. In Junos, administrators can disable an interface through its configuration when the interface should not be used. This is different from a physical link failure, where the interface may be administratively enabled but the physical connection is unavailable. Understanding the difference between administrative and operational states is important when troubleshooting interfaces. The show interfaces terse command can help administrators identify these conditions quickly across multiple interfaces.

Question 50

Which Junos configuration statement is used to administratively disable an interface?

1. shutdown
2. disable
3. deactivate-interface
4. stop

Correct Answer: 2

Explanation

The disable statement is used under the appropriate interface configuration hierarchy to administratively disable an interface. This prevents the interface from operating normally while preserving its configuration. Administrators may disable an interface temporarily during maintenance, troubleshooting, or network redesign. Because the configuration remains present, the interface can later be re-enabled by removing the disable statement and committing the change. This differs from physically disconnecting a cable because administrative status is controlled through the Junos configuration rather than through the physical connection.

Question 51

Which routing protocol is classified as an interior gateway protocol?

1. BGP
2. OSPF
3. FTP
4. SSH

Correct Answer: 2

Explanation

OSPF is an interior gateway protocol used to exchange routing information within an autonomous system. It is a link-state routing protocol that allows participating routers to build a view of the network topology and calculate paths using the Shortest Path First algorithm. Interior gateway protocols are generally used for routing within an organization or service-provider network. BGP, by contrast, is primarily used between autonomous systems. Understanding the distinction between IGPs and EGPs is important when studying routing architecture and selecting appropriate protocols for different network environments.

Question 52

Which protocol is commonly used to exchange routing information between autonomous systems?

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

Correct Answer: 3

Explanation

Border Gateway Protocol, or BGP, is used to exchange routing information between autonomous systems. It plays a central role in Internet routing and can also be used within large organizations and service-provider environments. BGP makes routing decisions using attributes and policies, allowing administrators to influence route selection and advertisement. Unlike ARP and ICMP, which serve other networking functions, BGP is specifically designed for exchanging reachability information between routing domains. Junos devices support BGP as part of their routing capabilities.

Question 53

Which protocol is responsible for delivering IP packets across a network based on routing information?

1. IP
2. DNS
3. DHCP
4. NTP

Correct Answer: 1

Explanation

Internet Protocol, or IP, provides the addressing and packet-delivery framework used to move packets across interconnected networks. Each IP packet contains source and destination addresses that allow routers to determine where the packet should be forwarded. Routing protocols such as OSPF and BGP provide information that routers use to construct routing tables, while IP provides the packet format and addressing mechanism. DNS, DHCP, and NTP perform different functions related to naming, configuration, and time synchronization. Understanding the role of IP is fundamental to network communication.

Question 54

Which protocol is commonly used to securely manage a Junos device remotely?

1. Telnet
2. SSH
3. FTP
4. TFTP

Correct Answer: 2

Explanation

SSH provides encrypted remote access to the Junos command-line interface. It protects management traffic by encrypting information exchanged between the administrator and the device. This includes authentication information and the commands or responses transmitted during the session. SSH is therefore widely used for secure network-device administration. Telnet provides remote CLI access but does not offer the same level of encryption. Administrators should configure secure authentication and access controls alongside SSH to reduce the risk of unauthorized access to network infrastructure.

Question 55

Which protocol provides encrypted web-based communication?

1. HTTP
2. HTTPS
3. FTP
4. TFTP

Correct Answer: 2

Explanation

HTTPS provides encrypted communication for web-based applications by using HTTP over a secure cryptographic connection. Encryption helps protect information exchanged between a client and server from unauthorized observation or modification during transmission. Although HTTPS is not a Junos-specific management protocol, understanding common network protocols is important for network administrators. HTTP itself does not provide the same encryption protections. Network professionals should recognize the difference between application protocols and secure versions used to protect data during network communication.

Question 56

What is the primary purpose of a default route?

1. To provide a path when no more specific route exists
2. To disable dynamic routing
3. To assign IP addresses
4. To identify MAC addresses

Correct Answer: 1

Explanation

A default route provides a forwarding path for destinations that do not match a more specific route in the routing table. It is often represented as 0.0.0.0/0 for IPv4. When a router receives a packet for which no more specific route exists, it can use the default route if one is available. Default routes are commonly used to direct traffic toward an upstream router or Internet service provider. They can simplify routing configurations by avoiding the need to maintain individual routes for every possible external destination.

Question 57

Which routing entry represents the IPv4 default route?

1. 127.0.0.0/8
2. 10.0.0.0/8
3. 172.16.0.0/12
4. 0.0.0.0/0

Correct Answer: 4

Explanation

The IPv4 default route is represented as 0.0.0.0/0. The prefix length of zero means that the route can match any IPv4 destination when a more specific route is not available. Routers can use this route to forward unknown destinations toward a designated next hop. It is commonly configured on edge routers that send external traffic toward an upstream provider. Understanding the default route is important because it is frequently used in enterprise, branch, and Internet-connected network designs.

Question 58

Which Junos routing protocol is commonly used for internal link-state routing?

1. OSPF
2. BGP
3. FTP
4. DNS

Correct Answer: 1

Explanation

OSPF is a commonly used internal link-state routing protocol supported by Junos. It enables routers within an autonomous system to exchange topology information and calculate paths through the network. Because OSPF maintains a link-state database, routers can calculate routes based on the network topology rather than relying only on information from a single neighboring device. OSPF also supports areas, which can help organize larger networks. Administrators can use Junos operational commands to verify OSPF neighbors, routes, and protocol status during troubleshooting.

Question 59

Which Junos command can be used to display information about OSPF neighbors?

1. show ospf neighbor
2. show ospf route
3. show neighbors ospf
4. monitor ospf neighbor

Correct Answer: 1

Explanation

The show ospf neighbor command displays information about OSPF neighbor relationships on a Junos device. OSPF neighbors must establish an appropriate adjacency before exchanging routing information according to the protocol’s operation. Administrators can use this command to verify whether expected neighbors are present and examine their current states. If an expected adjacency is missing, additional troubleshooting can involve interface configuration, addressing, area configuration, authentication, and network connectivity. Checking OSPF neighbors is therefore an important step when diagnosing internal routing problems.

Question 60

Which command displays information about BGP peer sessions on a Junos device?

1. show bgp neighbor
2. show bgp peer
3. show bgp summary
4. show routing bgp

Correct Answer: 3

Explanation

The show bgp summary command provides a concise overview of BGP peer sessions and related information. It can help administrators determine whether configured BGP neighbors are established and exchanging routing information. The summary output can include peer addresses, autonomous-system information, session state, and route counts. This makes it useful for an initial assessment of BGP operation. When a more detailed investigation is required, additional BGP commands can provide information about individual peers, received routes, advertised routes, and protocol attributes.