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Question 321

Which Junos command is used to display the current routing table?

1. show route
2. show routing table
3. show ip routing
4. show routes

Correct Answer: 1

Explanation

The show route command is the standard Junos operational-mode command used to display routing information. It provides details about routes learned from directly connected networks, static configuration, and dynamic routing protocols. Administrators can use additional options to examine routes for a particular destination, protocol, or routing instance. The routing table is essential for understanding how a Junos device determines where packets should be forwarded. When troubleshooting connectivity, checking the routing table is often one of the first steps because it confirms whether an appropriate route exists for the destination.

Question 322

Which Junos command displays the configuration changes that have not yet been committed?

1. show pending
2. show | compare
3. show uncommitted
4. show changes

Correct Answer: 2

Explanation

The show | compare command is used in Junos configuration mode to display differences between the candidate configuration and the active configuration. These differences represent changes that have not yet been committed. The output can show added, modified, or deleted configuration statements. This command is particularly useful before committing changes because it gives administrators an opportunity to review their work and identify unintended modifications. A typical workflow involves making changes, reviewing them with show | compare, validating them with commit check, and then performing a normal commit after confirming that the configuration is correct.

Question 323

Which IPv4 address is commonly used as the loopback address for local host testing?

1. 192.168.1.1
2. 10.0.0.1
3. 127.0.0.1
4. 172.16.0.1

Correct Answer: 3

Explanation

The IPv4 address 127.0.0.1 is the commonly used loopback address for testing communication within the local host. Traffic sent to this address is handled internally and does not normally leave the device through a physical network interface. The loopback range is 127.0.0.0/8, with 127.0.0.1 being the most commonly recognized address. Loopback testing can help determine whether local TCP/IP functionality is operating correctly. The other addresses listed belong to private IPv4 ranges and are normally used for communication across network interfaces rather than internal host loopback testing.

Question 324

Which Junos command displays information about the system’s storage usage?

1. show system storage
2. show storage status
3. show disk usage
4. show system disks

Correct Answer: 1

Explanation

The show system storage command displays storage utilization information on a Junos device. This can help administrators determine how much space is available on different file systems and identify situations where storage is becoming full. Adequate storage is important because logs, configuration files, software packages, and other system data may require available disk space. A nearly full file system can cause operational problems or interfere with maintenance activities. Administrators can use storage information together with log and system commands when troubleshooting issues related to file systems or device resource utilization.

Question 325

Which routing protocol is classified as a path-vector protocol?

1. OSPF
2. BGP
3. STP
4. NTP

Correct Answer: 2

Explanation

BGP is classified as a path-vector routing protocol. It exchanges reachability information between autonomous systems and uses path attributes to make routing decisions. One important attribute is the AS Path, which records the autonomous systems associated with a route advertisement and helps prevent routing loops. OSPF, by comparison, is a link-state routing protocol that builds a topology database and uses SPF calculations. STP is a Layer 2 loop-prevention protocol, while NTP provides time synchronization. Understanding routing-protocol categories helps administrators distinguish how different protocols exchange information and determine paths.

Question 326

Which Junos command displays the status of OSPF interfaces?

1. show ospf interface
2. show ospf ports
3. show ospf links
4. show protocol ospf

Correct Answer: 1

Explanation

The show ospf interface command provides information about OSPF-enabled interfaces. The output can include interface state, area membership, timers, network type, and other OSPF-related details. This information is useful when troubleshooting OSPF adjacency problems or verifying that an interface is participating in the expected OSPF area. If an OSPF neighbor relationship is not forming correctly, administrators can compare interface settings with the neighboring router. OSPF interface information can also be reviewed alongside the neighbor table and link-state database to identify whether the problem is local to an interface or part of a broader routing issue.

Question 327

Which Junos command can display the device hostname and other basic system information?

1. show system information
2. show version
3. show hostname
4. show device

Correct Answer: 2

Explanation

The show version command provides basic information about the Junos device and installed software. Depending on the platform and release, the output can include the hostname, Junos version, kernel information, package details, and system architecture. This command is useful when identifying the software environment before troubleshooting or planning a configuration change. Knowing the exact Junos version can also be important because available features and command behavior may differ between releases. Administrators frequently use show version as one of the first commands when collecting basic information about a Junos device.

Question 328

What is the main purpose of an IPv4 subnet mask?

1. Identify the network and host portions of an address
2. Encrypt IP traffic
3. Identify the MAC address
4. Select a BGP peer

Correct Answer: 1

Explanation

An IPv4 subnet mask identifies which bits of an IPv4 address represent the network portion and which bits represent the host portion. For example, the mask 255.255.255.0 corresponds to a /24 prefix, meaning the first 24 bits identify the network and the remaining 8 bits identify hosts within that network. Subnet masks allow networks to be divided into smaller logical segments and help routers determine whether a destination is directly connected or requires forwarding through another router. Understanding subnetting is fundamental for IPv4 addressing, routing, and interface configuration.

Question 329

Which protocol is commonly used to provide secure terminal access to a Junos device?

1. SSH
2. TFTP
3. SNMP
4. NTP

Correct Answer: 1

Explanation

SSH, or Secure Shell, provides secure remote terminal access to Junos devices. It encrypts the management session, helping protect authentication credentials and administrative commands from interception. SSH is commonly used instead of Telnet because Telnet does not provide equivalent encryption for the session. Junos can be configured to allow SSH under the system services configuration hierarchy. Authentication can use local user accounts or external authentication mechanisms depending on the environment. Secure management access is an important part of network administration because configuration commands can significantly affect device operation and network connectivity.

Question 330

Which Junos command is used to save a candidate configuration as the active configuration?

1. save
2. commit
3. activate
4. apply

Correct Answer: 2

Explanation

The commit command activates the candidate configuration and makes it the active configuration on the Junos device. Junos separates configuration editing from activation, allowing administrators to make several changes and review them before applying them. The save command is associated with saving configuration data to a file rather than activating the candidate configuration. Before committing, administrators can use show | compare to review differences and commit check to validate the configuration. This workflow provides a controlled method for implementing configuration changes and reduces the likelihood of unintentionally activating incorrect settings.

Question 331

Which IPv6 prefix is used for link-local addresses?

1. 2000::/3
2. FC00::/7
3. FE80::/10
4. FF00::/8

Correct Answer: 3

Explanation

The FE80::/10 prefix is reserved for IPv6 link-local addresses. These addresses are used for communication on the local network segment and are not normally routed between different links. Link-local addressing plays an important role in IPv6 neighbor discovery and can also be used by routing protocols for communication between directly connected routers. Global unicast addresses are associated with broader routed communication, unique local addresses use the FC00::/7 range, and multicast addresses use FF00::/8. Correctly identifying IPv6 address scopes is important when troubleshooting routing and neighbor-discovery behavior.

Question 332

Which Junos command displays active users connected to the device?

1. show system users
2. show active users
3. show users connected
4. show login status

Correct Answer: 1

Explanation

The show system users command displays information about users who currently have active sessions on the Junos device. This information can help administrators monitor management access and identify active login sessions. Depending on the platform and session type, the output may include usernames, terminal information, login times, and connection details. This command can be useful during troubleshooting or when investigating configuration changes made on a device. Administrators can also review authentication and system logs for additional information about login activity. Monitoring active sessions contributes to better operational and security awareness.

Question 333

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

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

Correct Answer: 2

Explanation

BGP is the routing protocol commonly used to exchange routing information between autonomous systems. It is designed for interdomain routing and provides extensive policy controls through attributes such as AS Path, local preference, and MED. BGP is widely used for Internet routing and for connections between organizations and service providers. OSPF and RIP are generally used for internal routing, while STP operates at Layer 2 to prevent switching loops. Understanding the distinction between internal and external routing protocols is important when designing or troubleshooting networks that connect multiple autonomous systems.

Question 334

Which Junos command can be used to display the ARP table?

1. show arp
2. show ip arp-table
3. show ethernet arp
4. show neighbors arp

Correct Answer: 1

Explanation

The show arp command displays the ARP table on a Junos device. ARP is used by IPv4 devices to determine the Layer 2 MAC address associated with an IPv4 address on a local network. The resulting information allows the device to deliver Ethernet frames to the appropriate local destination. Administrators can use the ARP table when troubleshooting local IPv4 connectivity, particularly when a device can reach a network but cannot communicate with a specific neighbor. Missing or unexpected ARP entries may indicate issues involving addressing, VLAN configuration, interface status, or local Layer 2 connectivity.

Question 335

Which command is used to enter Junos configuration mode?

1. edit
2. configure
3. set
4. commit

Correct Answer: 2

Explanation

The configure command is used from operational mode to enter Junos configuration mode. Configuration mode provides access to the candidate configuration, allowing administrators to add, modify, or delete configuration statements. Changes made in configuration mode do not become active until they are committed. Once inside configuration mode, administrators can use commands such as edit to navigate through the hierarchy, set to add statements, and delete to remove them. This separation between operational and configuration modes is a fundamental feature of Junos and provides administrators with greater control over configuration changes.

Question 336

Which protocol is responsible for assigning IPv4 addresses dynamically to hosts?

1. DHCP
2. NTP
3. SNMP
4. OSPF

Correct Answer: 1

Explanation

DHCP, or Dynamic Host Configuration Protocol, is used to automatically provide IPv4 configuration information to client devices. A DHCP server can assign an IPv4 address and provide additional information such as the subnet mask, default gateway, DNS servers, and lease duration. This reduces the need to manually configure every client. DHCP is different from OSPF, which exchanges routing information, NTP, which synchronizes clocks, and SNMP, which supports monitoring and management. When clients cannot obtain addresses, administrators can investigate DHCP server availability, VLAN connectivity, relay configuration, and client-side settings.

Question 337

Which Junos command can display the system alarms currently reported by the device?

1. show chassis alarms
2. show system alarms
3. show alarms status
4. show device alarms

Correct Answer: 2

Explanation

The show system alarms command displays system alarms reported by a Junos device. Alarms can provide information about conditions that may require administrator attention, including certain hardware, environmental, or system-related issues. Checking alarms is an important part of device health monitoring. Administrators may also examine chassis information and system logs to gather additional details about an alarm condition. An alarm does not always identify the complete cause of a problem by itself, so it should be considered together with other diagnostic information. Regularly reviewing alarms can help identify issues before they affect network operation.

Question 338

What is the primary function of OSPF’s link-state database?

1. Store information about the network topology
2. Store user passwords
3. Record MAC addresses
4. Store DHCP leases

Correct Answer: 1

Explanation

The OSPF link-state database stores information describing the network topology known to an OSPF router. OSPF routers exchange link-state advertisements, allowing each router in an area to build a consistent database of relevant topology information. The router then uses this information with the Shortest Path First algorithm to calculate routes. The database is therefore an important part of OSPF’s link-state operation. It is different from an Ethernet switching table, which stores MAC addresses, and from DHCP lease information. Administrators can inspect the OSPF database when troubleshooting topology or route-calculation problems.

Question 339

Which Junos command displays hardware components installed in the chassis?

1. show system inventory
2. show chassis hardware
3. show hardware status
4. show device chassis

Correct Answer: 2

Explanation

The show chassis hardware command provides an inventory of hardware components recognized by the Junos device. Depending on the platform, it can show the chassis, Routing Engines, line cards, power supplies, fan modules, and other hardware components. This information is useful when verifying the physical configuration of a device or investigating hardware-related issues. Administrators can combine this command with chassis alarms and system logs to investigate abnormal hardware conditions. Because Junos runs on different hardware platforms, the exact components shown in the output depend on the specific device model and installed modules.

Question 340

Which Junos command is commonly used to display the status of all interfaces in a concise format?

1. show interfaces terse
2. show interfaces summary
3. show ports status
4. show interface brief

Correct Answer: 1

Explanation

The show interfaces terse command provides a concise summary of interface status and addressing information. It is commonly used as an initial troubleshooting command because it allows administrators to quickly identify interfaces that are administratively disabled or operationally down. The output is much shorter than the detailed or extensive interface commands, making it easier to review on devices with many interfaces. Once a problematic interface is identified, administrators can use more detailed commands to examine statistics, errors, physical properties, and protocol information. This makes the terse command useful for quickly assessing overall interface health.