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Question 281

Which Junos command displays a summary of BGP peer relationships?

1. show bgp neighbors
2. show bgp summary
3. show routing bgp
4. show protocols bgp

Correct Answer: 2

Explanation

The show bgp summary command provides a concise overview of BGP peer relationships on a Junos device. The output can include information such as peer addresses, autonomous system numbers, session states, and the number of routes received or advertised. This command is particularly useful as a first step when troubleshooting BGP because it quickly shows whether configured peer sessions are established. More detailed information about a specific neighbor can be obtained with additional BGP neighbor commands. Reviewing BGP session status helps administrators identify issues involving connectivity, configuration, authentication, or routing policy.

Question 282

Which Junos command displays the current software version running on a device?

1. show version
2. show software
3. show system release
4. show chassis version

Correct Answer: 1

Explanation

The show version command provides information about the Junos software version installed and running on the device. The output can also include information about the hostname, kernel, package details, and system architecture depending on the platform. Knowing the installed Junos version is useful when troubleshooting because command behavior and available features can vary between releases and platforms. Administrators may also use version information when planning upgrades, checking compatibility, or communicating with support teams. The command is available from operational mode and is one of the common initial commands used when inspecting a Junos device.

Question 283

Which routing table entry is normally created automatically when an interface is configured with an IP address and becomes active?

1. Static route
2. BGP route
3. Direct route
4. Default route

Correct Answer: 3

Explanation

A direct route is normally installed when an interface is configured with an IP address and is operationally active. The route represents the network directly connected to that interface and does not require a separate routing protocol or static route configuration. Direct routes are fundamental to the routing table because they tell the device which networks are reachable through its own interfaces. Static routes must be manually configured, while BGP routes are learned from BGP peers. A default route is also configured separately unless it is learned dynamically. Administrators can inspect direct routes using the Junos routing-table commands.

Question 284

Which Junos command can display the system’s current date and time?

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

Correct Answer: 2

Explanation

The show clock command is used to display the current system date and time on a Junos device. Accurate system time is important for network operations because logs, alarms, authentication mechanisms, and troubleshooting activities depend on reliable timestamps. If the system clock is incorrect, comparing events across multiple network devices can become difficult. NTP can be configured to keep the system clock synchronized with a reliable time source. Administrators often check the system clock when investigating log events or verifying whether NTP synchronization is functioning as expected.

Question 285

Which Junos command displays detailed information about an interface, including operational statistics?

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

Correct Answer: 1

Explanation

The show interfaces extensive command provides detailed information about an interface and can include operational statistics, error counters, traffic information, physical characteristics, and other interface details. This makes it useful when troubleshooting problems that cannot be identified from the concise show interfaces terse output. Administrators may inspect packet counters, errors, link information, and interface properties when diagnosing connectivity or performance issues. The amount of information can be significant, so the command is usually used after identifying a specific interface that requires deeper investigation. Detailed interface output is an important troubleshooting resource on Junos devices.

Question 286

Which protocol is commonly used to securely transfer files between network devices?

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

Correct Answer: 3

Explanation

Secure Copy Protocol, or SCP, provides a secure method for transferring files between systems using encrypted SSH-based communication. On Junos devices, SCP can be used for tasks such as transferring configuration files, logs, software packages, or other supported files. Unlike traditional FTP and TFTP, SCP provides encryption for the transfer session. Telnet is primarily a remote-access protocol and does not provide the same level of security as SSH-based methods. Secure file transfer is important when configuration or operational files contain information that should not be transmitted as plain text across an untrusted network.

Question 287

Which IPv4 address range is part of the private address space defined by RFC 1918?

1. 8.0.0.0/8
2. 172.16.0.0/12
3. 100.64.0.0/10
4. 192.0.2.0/24

Correct Answer: 2

Explanation

The 172.16.0.0/12 range is one of the three IPv4 private address ranges defined by RFC 1918. The other two are 10.0.0.0/8 and 192.168.0.0/16. Private addresses are commonly used inside organizations and are not normally routed directly across the public Internet. Devices using private addresses often require network address translation when accessing public networks. The other ranges listed serve different purposes. Recognizing private address ranges is important when configuring interfaces, designing internal networks, and troubleshooting routing or NAT-related connectivity problems.

Question 288

What is the purpose of the commit confirmed feature when making remote configuration changes?

1. It permanently disables rollback
2. It automatically saves the configuration to a file
3. It prevents all routing changes
4. It provides automatic rollback if the change is not confirmed

Correct Answer: 4

Explanation

The commit confirmed feature provides protection when administrators make potentially disruptive configuration changes, especially on remotely accessed devices. The configuration is committed temporarily and must be confirmed within the specified period. If the administrator does not confirm the change, Junos automatically rolls back to the previous committed configuration. This helps protect against situations where a configuration change causes loss of management connectivity. It is particularly useful when changing interface addresses, routing, firewall filters, or other settings that could affect remote access. After verifying that the device remains accessible and operates correctly, the administrator performs a normal confirmation commit.

Question 289

Which Junos command displays active system alarms?

1. show system alarms
2. show alarms active
3. show chassis alerts
4. show system warnings

Correct Answer: 1

Explanation

The show system alarms command is used to display system alarms on a Junos device. Alarms can indicate hardware, configuration, environmental, or other conditions that require administrator attention. Reviewing alarms is useful during troubleshooting because they may reveal issues that are not immediately obvious from interface or routing commands. Administrators can also inspect chassis-related information when investigating hardware conditions. System alarms should be considered alongside logs and hardware status when determining the cause of a problem. Regularly monitoring alarms helps identify conditions that could affect device reliability or network operation.

Question 290

Which protocol provides automatic IP address configuration to network hosts?

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

Correct Answer: 3

Explanation

Dynamic Host Configuration Protocol, or DHCP, provides automatic network configuration information to clients. Depending on the environment, DHCP can provide an IP address, subnet mask, default gateway, DNS server information, lease duration, and other options. This reduces the need to manually configure every host on a network. DHCP is different from NTP, which synchronizes time, and SNMP, which is used for monitoring and management. SCP provides secure file transfer. Understanding DHCP is important when troubleshooting client addressing problems, especially when hosts are unable to obtain valid network configuration automatically.

Question 291

Which Junos command is commonly used to view ARP entries for IPv4 neighbors?

1. show arp
2. show ipv4 neighbors
3. show neighbor arp
4. show ethernet arp-table

Correct Answer: 1

Explanation

The show arp command displays Address Resolution Protocol information for IPv4 neighbors. ARP maps an IPv4 address to a Layer 2 MAC address on a local network segment. When a Junos device needs to send traffic to a directly connected IPv4 destination, it may use ARP to discover the corresponding MAC address. The ARP table is useful when troubleshooting local connectivity issues because it can show whether the expected neighbor has been resolved. If an expected entry is missing or incorrect, administrators can investigate interface status, VLAN configuration, addressing, and local Layer 2 connectivity.

Question 292

Which BGP attribute is generally preferred when selecting an outbound route within an autonomous system?

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

Correct Answer: 1

Explanation

BGP local preference is used to influence outbound routing decisions within an autonomous system. When comparing eligible routes, a higher local preference value is generally preferred. Because local preference is distributed within the autonomous system, administrators can use it to influence which external exit point routers prefer. The AS Path is another important BGP attribute and is used in path selection and loop prevention, while MED can provide information about preferred entry points. Understanding local preference is particularly useful in environments with multiple Internet or external network connections where administrators need to control outbound traffic paths.

Question 293

Which IPv6 address type is designed for communication within a local link and is not normally routed between links?

1. Global unicast
2. Multicast
3. Link-local
4. Unique local

Correct Answer: 3

Explanation

IPv6 link-local addresses are designed for communication on the local network link. They use the FE80::/10 prefix and are automatically associated with IPv6-enabled interfaces in many situations. Routers do not normally forward packets using link-local source or destination addresses between different links. Link-local addressing is important for functions such as Neighbor Discovery and for some IPv6 routing protocol operations. Global unicast addresses are intended for broader routed communication, while multicast addresses support one-to-many communication. Unique local addresses are intended for private IPv6 networks and are represented by the FC00::/7 range.

Question 294

Which command can be used to display the differences between the candidate and active Junos configurations?

1. show configuration | display set
2. show | compare
3. compare active
4. show configuration differences

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. It is especially useful before committing changes because it lets administrators review exactly what has been added, changed, or deleted. This provides an opportunity to identify mistakes before they become active. Administrators can make corrections in the candidate configuration and run the comparison again before committing. The command is part of the normal Junos configuration workflow and supports safer change management by providing clear visibility into pending configuration modifications.

Question 295

Which routing protocol uses the Shortest Path First algorithm to calculate paths?

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

Correct Answer: 3

Explanation

OSPF uses the Shortest Path First algorithm to calculate routes based on the link-state information maintained in its database. Each OSPF router builds a view of the network topology from link-state advertisements and then calculates the shortest available paths. This allows OSPF to make routing decisions based on the topology rather than simply relying on hop count. BGP uses a path-selection process based on multiple attributes, while RIP uses hop count as its primary metric. DHCP does not perform routing. Understanding SPF processing is useful when troubleshooting OSPF route calculation and convergence.

Question 296

What does the disable statement generally do when applied to a Junos interface configuration?

1. Deletes the interface permanently
2. Prevents the interface from being administratively enabled
3. Changes the interface IP address
4. Converts the interface to a trunk

Correct Answer: 2

Explanation

The disable statement places an interface into an administratively disabled state. When the configuration is committed, the interface is prevented from operating normally until the disable statement is removed and the configuration is committed again. This is similar to administratively shutting down an interface. Administrators may use this feature when taking an interface out of service for maintenance or troubleshooting. It does not delete the interface configuration or automatically change its IP addressing or switching mode. The interface can be re-enabled by removing the disable configuration and committing the resulting changes.

Question 297

Which Junos command can display the current routing table?

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

Correct Answer: 1

Explanation

The show route command displays the routing table on a Junos device. It provides information about routes learned through directly connected interfaces, static configuration, routing protocols, and other available sources. Administrators can use additional forms of the command to examine specific destinations, protocol routes, route details, or routing tables associated with particular routing instances. The routing table is essential for understanding how a device determines the next hop for packets. When troubleshooting connectivity, administrators commonly compare the routing table with interface status and forwarding information to determine whether the expected path exists.

Question 298

Which protocol is commonly used to monitor and manage network devices?

1. SNMP
2. OSPF
3. SCP
4. STP

Correct Answer: 1

Explanation

Simple Network Management Protocol, or SNMP, is commonly used to monitor and manage network devices. Network management systems can use SNMP to collect information such as interface statistics, system status, and performance-related data. SNMP can also support notifications for certain events, depending on the configuration. SNMPv3 adds security features such as authentication and privacy mechanisms that are not available in the same way with earlier versions. OSPF handles routing, SCP provides secure file transfer, and STP provides Layer 2 loop prevention. SNMP is therefore primarily associated with network monitoring and management operations.

Question 299

Which Junos command can display the current users logged into the device?

1. show system users
2. show users active
3. show login users
4. show system sessions

Correct Answer: 1

Explanation

The show system users command displays information about users currently logged into a Junos device. The output can help administrators determine which accounts have active sessions and may include information such as usernames, terminal sessions, login times, and connection details. This is useful for operational monitoring and security administration. When investigating unexpected configuration changes or active management sessions, administrators can check the current users along with system logs. User authentication itself can be configured locally or through external services such as RADIUS or TACACS+, depending on the network’s requirements.

Question 300

Which Junos component is primarily responsible for maintaining routing protocol information and making control-plane decisions?

1. Packet Forwarding Engine
2. Routing Engine
3. Switching fabric
4. Physical interface module

Correct Answer: 2

Explanation

The Routing Engine is primarily responsible for control-plane operations on a Junos device. It runs the Junos operating system and manages routing protocols, maintains routing information, processes configuration, and performs other system-management functions. The Packet Forwarding Engine handles high-speed forwarding using the forwarding information prepared by the control plane. This separation between control and forwarding functions is a key part of Junos architecture. Understanding these roles helps administrators identify whether a problem is related to routing and control-plane processing or to actual packet forwarding through the device.