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Question 361

Which Junos command displays a summary of BGP peer sessions and their current states?

1. show ospf neighbor
2. show route
3. show bgp summary
4. show interfaces terse

Correct Answer: 3

Explanation

The show bgp summary command provides a concise overview of BGP sessions configured on a Junos device. It typically displays information such as the local autonomous system, BGP peer addresses, peer AS numbers, received prefixes, and session states. Network administrators commonly use this command as an initial troubleshooting step when verifying BGP connectivity. If a peer is established, the session state indicates that the BGP relationship is operational. Other commands provide useful routing or interface information, but they do not specifically summarize BGP neighbor sessions. Therefore, show bgp summary is the appropriate command for quickly checking BGP peer status.

Question 362

Which Junos command can be used to display routes for a specific destination?

1. show route 192.0.2.1
2. show system users
3. show chassis hardware
4. show log messages

Correct Answer: 1

Explanation

The show route command can be followed by a destination address to examine routing information for that particular destination. For example, show route 192.0.2.1 can help determine whether a route exists and which routing information is associated with it. This is useful when troubleshooting connectivity because it allows an administrator to inspect the selected route rather than reviewing the entire routing table. Other commands shown in the options are intended for different purposes, such as checking users, hardware, or system logs. Therefore, using show route with the destination address is the appropriate method.

Question 363

Which Junos command provides information about the hardware installed in a device?

1. show system uptime
2. show chassis hardware
3. show route
4. show interfaces terse

Correct Answer: 2

Explanation

The show chassis hardware command displays hardware-related information about the Junos device. It can provide details about installed components such as chassis modules, Routing Engines, interface components, and other hardware depending on the platform. This command is useful during inventory checks, troubleshooting, and hardware verification. By contrast, show system uptime focuses on system runtime information, while show route displays routing information and show interfaces terse summarizes interface status. When an administrator needs to determine which physical hardware components are installed in a Juniper device, show chassis hardware is the appropriate operational command.

Question 364

Which IPv6 address range is reserved for multicast addresses?

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

Correct Answer: 4

Explanation

IPv6 multicast addresses use the FF00::/8 address range. The first eight bits of an IPv6 multicast address are set to FF, identifying the address as multicast. Multicast allows traffic to be delivered to a group of interested receivers rather than to one specific host. The FE80::/10 range is used for IPv6 link-local addresses, while FC00::/7 is associated with unique local addresses. The 2000::/3 range is commonly used for global unicast addressing. Understanding these IPv6 address ranges is important when configuring and troubleshooting IPv6 networks on Junos devices.

Question 365

Which command is commonly used to test IPv6 connectivity to a remote host on Junos?

1. ping inet6
2. show route
3. show arp
4. traceroute

Correct Answer: 1

Explanation

The ping inet6 command is used on Junos devices to test connectivity using IPv6. It sends ICMPv6 echo requests toward the specified destination and checks whether replies are received. This makes it useful for verifying IPv6 reachability between devices and identifying basic connectivity problems. The standard ping command is commonly associated with IPv4 testing, while show route displays routing information and show arp examines IPv4 address-resolution information. When an administrator specifically needs to test IPv6 reachability, ping inet6 provides the appropriate testing method.

Question 366

Which Junos command displays IPv6 Neighbor Discovery information?

1. show arp
2. show ndp
3. show route
4. show ethernet-switching table

Correct Answer: 2

Explanation

The show ndp command displays IPv6 Neighbor Discovery Protocol information on a Junos device. NDP performs functions for IPv6 that are related to address resolution, neighbor discovery, and local network communication. Administrators can use this command to examine discovered IPv6 neighbors and their associated information. show arp is primarily used for IPv4 ARP information, while show route displays routing information and show ethernet-switching table provides Layer 2 switching information. Therefore, when troubleshooting IPv6 neighbor relationships, show ndp is the appropriate operational command.

Question 367

Which Junos command provides information about running system processes?

1. show system processes
2. show system users
3. show configuration
4. show route

Correct Answer: 1

Explanation

The show system processes command provides information about processes running on a Junos device. This can help administrators investigate system activity and identify processes that may be consuming resources or behaving unexpectedly. Monitoring system processes can be useful during troubleshooting, particularly when investigating performance-related issues. show system users instead displays logged-in users, while show configuration displays configuration information and show route provides routing information. Therefore, when the objective is to inspect active system processes, show system processes is the relevant Junos command.

Question 368

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

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

Correct Answer: 3

Explanation

Border Gateway Protocol, or BGP, is designed to exchange routing information between autonomous systems. It is widely used for inter-domain routing and supports policy-based route selection. BGP uses attributes such as AS path and local preference to influence route selection. OSPF is primarily an interior gateway protocol used within an autonomous system, while RIP is another interior routing protocol with a simpler hop-count-based approach. STP is not a routing protocol; it is used to prevent Layer 2 switching loops. Therefore, BGP is the appropriate protocol for exchanging routes between autonomous systems.

Question 369

Which Junos command is used to add a configuration statement in configuration mode?

1. delete
2. rollback
3. set
4. exit

Correct Answer: 3

Explanation

The set command is used in Junos configuration mode to add or modify configuration statements. For example, an administrator can use a set command to configure an interface, routing option, or system parameter. After making changes, the candidate configuration normally needs to be committed before it becomes active. The delete command removes configuration statements, rollback restores a previous configuration, and exit leaves the current configuration context. Therefore, set is the appropriate command when an administrator needs to create or modify a configuration statement.

Question 370

Which protocol is commonly used for network management and monitoring?

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

Correct Answer: 2

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 other operational data from supported devices. SNMP versions include different security capabilities, with SNMPv3 providing authentication and encryption features. FTP is primarily used for file transfers, while BGP and OSPF are routing protocols. Therefore, SNMP is the protocol most directly associated with network monitoring and management. Administrators can use SNMP information to observe network health and detect operational issues.

Question 371

Which Junos command displays active system alarms?

1. show system alarms
2. show route
3. show interfaces terse
4. show bgp summary

Correct Answer: 1

Explanation

The show system alarms command displays active alarms reported by the Junos device. System alarms can indicate hardware, environmental, or other conditions that require administrator attention, depending on the platform and situation. Checking alarms is an important troubleshooting step when a device reports an abnormal condition. The show route command focuses on routing information, show interfaces terse summarizes interface states, and show bgp summary displays BGP session information. Therefore, when an administrator needs to check whether the system has active alarms, show system alarms is the appropriate command.

Question 372

Which Junos command moves the configuration hierarchy to the top level?

1. up
2. top
3. exit
4. edit

Correct Answer: 2

Explanation

The top command moves the user directly to the top of the Junos configuration hierarchy while remaining in configuration mode. This is useful when an administrator is working several levels deep and needs to quickly return to the root of the configuration hierarchy. The up command moves one level upward, while edit is used to move into a specified configuration hierarchy. exit can leave the current configuration context or configuration mode depending on the context. Therefore, top provides the direct method for returning to the top-level configuration hierarchy.

Question 373

Which type of route is automatically created when an interface has an active directly connected IP address?

1. Static route
2. BGP route
3. Direct route
4. OSPF external route

Correct Answer: 3

Explanation

A direct route is associated with a network that is directly connected to a device interface. When an interface is configured with an IP address and is operational, Junos can install a corresponding direct route in the routing table. This allows the device to recognize that destinations within the connected network are reachable through that interface without requiring a routing protocol or manually configured static route. Static routes are configured by an administrator, while BGP and OSPF routes are learned through routing protocols. Therefore, an active connected interface results in a direct route for the associated network.

Question 374

Which Junos command provides a concise summary of interface status and addresses?

1. show interfaces terse
2. show interfaces extensive
3. show chassis hardware
4. show system uptime

Correct Answer: 1

Explanation

The show interfaces terse command provides a concise summary of interfaces, including their administrative and operational status and logical interface information. It is frequently used as a quick troubleshooting command because administrators can review many interfaces without receiving the large amount of detail produced by more extensive interface commands. show interfaces extensive provides much more detailed information, while show chassis hardware focuses on physical hardware and show system uptime reports system runtime information. Therefore, show interfaces terse is the suitable command for obtaining a quick overview of interface status.

Question 375

Which BGP attribute is commonly used to prefer one exit point over another within an autonomous system?

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

Correct Answer: 2

Explanation

BGP local preference is commonly used within an autonomous system to influence which exit path should be preferred for outbound traffic. A higher local preference value is generally preferred when comparing applicable BGP routes. Because local preference is propagated within the autonomous system, administrators can use it to establish preferred exit points according to network policy. AS path length is another BGP selection factor, while MED can influence inbound path selection between neighboring autonomous systems. The origin attribute also participates in BGP route selection but does not serve the same primary purpose as local preference for selecting an outbound exit.

Question 376

Which Junos command displays how long the system has been running?

1. show system uptime
2. show system storage
3. show system users
4. show system alarms

Correct Answer: 1

Explanation

The show system uptime command displays information about how long the Junos device has been running since its most recent boot. It can also provide related system time and load information depending on the platform and Junos version. Uptime information is useful when troubleshooting unexpected reboots or determining whether a recent restart occurred. show system storage is used to examine storage utilization, show system users displays logged-in users, and show system alarms reports active alarms. Therefore, show system uptime is the correct command for checking the system’s running time.

Question 377

Which Junos command displays the MAC address table used by an Ethernet switch?

1. show arp
2. show route
3. show ethernet-switching table
4. show ndp

Correct Answer: 3

Explanation

The show ethernet-switching table command displays the Ethernet switching table on supported Junos switching platforms. The table contains learned MAC addresses and associated information such as VLAN and interface details. This information is useful when troubleshooting Layer 2 connectivity and verifying where a switch has learned a particular MAC address. show arp provides IPv4 address-resolution information, while show route displays Layer 3 routing information and show ndp provides IPv6 Neighbor Discovery information. Therefore, the Ethernet switching table command is the appropriate choice for examining learned Layer 2 MAC addresses.

Question 378

Which Junos configuration command removes an existing configuration statement?

1. set
2. delete
3. commit
4. up

Correct Answer: 2

Explanation

The delete command is used in Junos configuration mode to remove an existing configuration statement from the candidate configuration. For example, an administrator can delete an unwanted interface setting or routing option before committing the changes. The removal remains in the candidate configuration until a commit operation activates the changes. The set command adds or modifies configuration statements, commit activates candidate changes, and up moves one level higher in the configuration hierarchy. Therefore, delete is the correct command for removing configuration statements.

Question 379

Which protocol is commonly used to synchronize the time of network devices?

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

Correct Answer: 3

Explanation

Network Time Protocol, or NTP, is commonly used to synchronize the clocks of network devices with a reliable time source. Accurate time synchronization is important for logging, troubleshooting, authentication systems, certificates, and event correlation across multiple devices. Junos devices can be configured to obtain time from NTP servers. DNS is primarily used for name resolution, DHCP provides network configuration information to clients, and SNMP is used for network monitoring and management. Therefore, NTP is the protocol specifically designed to maintain synchronized system time across networked devices.

Question 380

Which Junos command displays the Junos OS version and basic software information?

1. show version
2. show route
3. show chassis hardware
4. show interfaces terse

Correct Answer: 1

Explanation

The show version command displays information about the Junos OS software version running on the device. It can also provide related software and system information that helps administrators identify the installed Junos release. Knowing the exact software version is useful when troubleshooting compatibility issues, reviewing features, or following platform-specific documentation. show route is used for routing information, show chassis hardware focuses on installed hardware, and show interfaces terse summarizes interface status. Therefore, show version is the appropriate command for checking the installed Junos OS version.