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Question 181

Which Junos command displays the system hostname?

1. show system host
2. show hostname
3. show system hostname
4. show host-name

Correct Answer: 3

Explanation

The show system hostname command displays the configured hostname of a Junos device. A hostname helps identify a device in the network and is commonly displayed in the command-line prompt. Using meaningful hostnames makes device administration easier, especially when engineers manage many routers or switches. The hostname can be configured under the system hierarchy. Administrators can verify the current value with the appropriate operational command before documenting or troubleshooting the device. Clear identification is particularly useful when working with remote systems and reviewing logs from multiple network devices.

Question 182

Which configuration hierarchy is used to configure the hostname on a Junos device?

1. system
2. hostname
3. services
4. management

Correct Answer: 1

Explanation

The system hierarchy contains configuration settings for the overall Junos device, including the hostname. The hostname identifies the device and is commonly used in management sessions and operational output. Junos organizes configuration into hierarchical sections, allowing administrators to configure related settings in a structured manner. To configure a hostname, the administrator enters the system hierarchy and specifies the desired name. The change becomes active after the candidate configuration is committed. A consistent hostname convention can simplify network administration and device identification.

Question 183

Which command displays information about users currently logged into a Junos device?

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

Correct Answer: 2

Explanation

The show system users command displays information about users who are currently logged into the Junos device. This can help administrators identify active management sessions and determine who is accessing the system. Monitoring active sessions is useful during maintenance and troubleshooting because multiple administrators may be connected simultaneously. The output can provide information such as usernames, terminal sessions, login times, and connection details depending on the platform. Administrators should review active sessions before making major configuration changes on shared devices.

Question 184

Which Junos configuration hierarchy is used to configure user accounts?

1. access
2. login
3. system login
4. authentication users

Correct Answer: 3

Explanation

The system login hierarchy is used to configure local user accounts, authentication classes, and related login settings in Junos. User accounts can be assigned appropriate login classes that determine their permissions. This provides administrators with a structured method of controlling access to the device. Local authentication can be used independently or together with external authentication services depending on the network design. Proper user configuration helps ensure that administrators receive only the privileges required for their responsibilities while maintaining secure management access.

Question 185

Which Junos login class provides full administrative privileges?

1. operator
2. read-only
3. super-user
4. unauthorized

Correct Answer: 3

Explanation

The super-user login class provides extensive administrative privileges on a Junos device. Users assigned to this class can perform configuration and operational tasks that require elevated permissions. Other predefined login classes provide more limited access depending on their intended purpose. Using appropriate privilege levels is important for maintaining administrative control and reducing unnecessary access. Organizations should assign users permissions according to their responsibilities. When multiple administrators manage a device, properly configured login classes help separate routine monitoring activities from privileged configuration operations.

Question 186

Which authentication protocol can be configured on Junos for centralized user authentication?

1. RADIUS
2. ARP
3. OSPF
4. SNMP

Correct Answer: 1

Explanation

RADIUS is a centralized authentication protocol that can be used with Junos devices. Instead of maintaining every administrator account locally, a network can use a centralized authentication server to validate user credentials. This can simplify account management across many network devices. RADIUS can also support authorization and accounting functions depending on the implementation. Junos provides configuration options for integrating with RADIUS servers. Centralized authentication is particularly useful in larger environments where administrators require consistent access policies across multiple devices.

Question 187

Which protocol is commonly used for centralized authentication and authorization in network environments?

1. NTP
2. TACACS+
3. ICMP
4. DHCP

Correct Answer: 2

Explanation

TACACS+ is commonly used for centralized authentication, authorization, and accounting of administrative access to network devices. It allows organizations to manage administrator credentials through centralized servers rather than maintaining separate local accounts on every device. TACACS+ can also separate authentication from authorization, providing detailed control over administrative privileges. Junos supports external authentication mechanisms such as TACACS+ and RADIUS. The choice between these services depends on the organization’s architecture, security requirements, and existing authentication infrastructure.

Question 188

Which protocol is primarily used to securely access the Junos CLI remotely?

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

Correct Answer: 3

Explanation

SSH, or Secure Shell, provides secure remote access to the Junos command-line interface. SSH encrypts the management session, helping protect credentials and administrative commands from being exposed over the network. It is preferred over insecure protocols such as Telnet for remote device administration. Junos can be configured to allow SSH access through the system services hierarchy. Administrators should also use appropriate authentication, access controls, and security policies to restrict management access to authorized users and trusted networks.

Question 189

Which Junos hierarchy is used to enable SSH service?

1. services ssh
2. system services ssh
3. protocols ssh
4. security ssh

Correct Answer: 2

Explanation

SSH service configuration is performed under the system services hierarchy in Junos. This hierarchy contains configuration for various system-level network services used by the device. Enabling SSH allows authorized users to establish secure CLI sessions remotely. Administrators can configure additional options and access restrictions according to the platform and network requirements. After modifying the configuration, the changes must be committed before becoming active. Secure management services should be carefully controlled to reduce unnecessary exposure of the device’s administrative interface.

Question 190

Which protocol is commonly used to securely transfer files between a Junos device and a remote system?

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

Correct Answer: 1

Explanation

SCP, or Secure Copy Protocol, can be used to securely transfer files between a Junos device and a remote system. It operates over SSH and provides encrypted file transfers. Administrators may use SCP for transferring configuration files, logs, software packages, or other supported files. Secure file transfer is preferable to unencrypted methods when sensitive information is involved. The exact file-transfer capabilities depend on the Junos platform and software version. Administrators should ensure that appropriate authentication and permissions are used during file transfers.

Question 191

Which protocol is primarily responsible for resolving an IPv4 address to a MAC address on a local network?

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

Correct Answer: 3

Explanation

ARP, or Address Resolution Protocol, maps an IPv4 address to a corresponding MAC address on a local network segment. When a device needs to send an Ethernet frame to a local IPv4 destination, it can use ARP to discover the destination’s hardware address. Junos devices maintain ARP information that can be inspected using operational commands. ARP is different from DNS, which resolves names to IP addresses, and DHCP, which provides network configuration information to clients.

Question 192

Which Junos command displays ARP table information?

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

Correct Answer: 1

Explanation

The show arp command displays ARP information maintained by the Junos device. The output can include IPv4 addresses, corresponding MAC addresses, interface information, and other details depending on the platform. Administrators use ARP information when troubleshooting local connectivity issues. If a device cannot communicate with a directly connected IPv4 host, checking the ARP table can help determine whether address resolution has occurred. ARP information should be considered alongside interface status, VLAN configuration, and IP addressing when investigating connectivity problems.

Question 193

Which protocol performs neighbor discovery for IPv6 networks?

1. ARP
2. NDP
3. DHCP
4. RIP

Correct Answer: 2

Explanation

IPv6 uses Neighbor Discovery Protocol, commonly called NDP, instead of ARP. NDP uses ICMPv6 messages to perform functions such as neighbor discovery, address resolution, router discovery, and duplicate address detection. This makes NDP an important component of IPv6 operation. Administrators troubleshooting IPv6 connectivity may inspect neighbor information to determine whether the device has successfully discovered other IPv6 nodes. Understanding the difference between ARP for IPv4 and NDP for IPv6 is important when managing dual-stack network environments.

Question 194

Which IPv6 address range is commonly used for link-local addresses?

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

Correct Answer: 3

Explanation

The FE80::/10 prefix is used for IPv6 link-local addresses. Link-local addresses are automatically associated with IPv6-enabled interfaces and are intended for communication on the local network segment. They are not routed across IPv6 routers. Link-local addresses are important for IPv6 neighbor discovery and are also commonly used by routing protocols for communication between directly connected neighbors. Administrators should recognize the FE80::/10 range when examining IPv6 interface and neighbor information.

Question 195

Which IPv6 address type is used to identify a group of receivers?

1. Unicast
2. Anycast
3. Multicast
4. Loopback

Correct Answer: 3

Explanation

An IPv6 multicast address identifies a group of receivers rather than a single destination. Packets sent to a multicast address can be delivered to multiple interested nodes. IPv6 multicast uses the FF00::/8 address range. Multicast is used by several network functions, including aspects of IPv6 neighbor discovery and routing protocols. It differs from unicast, which identifies a single destination, and anycast, where an address can identify multiple nodes but traffic is delivered to an appropriate member of the group.

Question 196

Which protocol automatically provides IP configuration information to many IPv4 clients?

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

Correct Answer: 1

Explanation

DHCP, or Dynamic Host Configuration Protocol, allows clients to automatically obtain network configuration information. Depending on the configuration, a DHCP server can provide an IP address, subnet mask, default gateway, DNS server information, and lease-related parameters. DHCP reduces the need to manually configure every client device. Junos devices can participate in DHCP-related functions depending on their role and platform. When troubleshooting DHCP connectivity, administrators should consider client requests, server availability, network forwarding, and address-pool configuration.

Question 197

Which protocol is commonly used to synchronize clocks across network devices?

1. DNS
2. FTP
3. NTP
4. SSH

Correct Answer: 3

Explanation

NTP, or Network Time Protocol, is used to synchronize clocks across networked devices. Accurate time is important for logging, troubleshooting, security investigations, authentication systems, and scheduled operations. A Junos device can be configured to use one or more NTP servers as time sources. Administrators can inspect NTP information to determine whether synchronization is occurring correctly. If the system clock is inaccurate, timestamps in logs may become difficult to correlate with events from other devices.

Question 198

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

1. SNMP
2. SMTP
3. SCP
4. SSH

Correct Answer: 1

Explanation

SNMP, or Simple Network Management Protocol, is commonly used by network management systems to monitor network devices. It can provide information about interfaces, system resources, counters, and other operational data. SNMP can also support management operations depending on the configuration and version. SNMPv3 provides security features such as authentication and encryption capabilities. Administrators should configure appropriate access controls and use secure SNMP versions where supported. Monitoring systems can use SNMP data to identify interface problems and track device performance.

Question 199

Which SNMP version provides authentication and privacy security features?

1. SNMPv1
2. SNMPv2c
3. SNMPv3
4. SNMPv2

Correct Answer: 3

Explanation

SNMPv3 provides security features that are not available in the same manner in earlier SNMP versions. It supports authentication to verify the source of management messages and privacy mechanisms to protect information in transit. Earlier versions such as SNMPv1 and SNMPv2c commonly rely on community strings and do not provide the same security model. When network management traffic may contain sensitive operational information, SNMPv3 can provide stronger protection. Administrators should still configure secure credentials and appropriate access controls.

Question 200

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

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

Correct Answer: 2

Explanation

The show version command displays information about the Junos software running on the device. It can provide the Junos release version along with platform and other system information depending on the device. Knowing the exact software version is important when troubleshooting, checking feature availability, reviewing compatibility, or planning upgrades. Administrators should verify the running version before applying platform-specific procedures or software recommendations. Version information can also help correlate device behavior with known software characteristics and release documentation.