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Extreme Certified Professional - Extreme Switching study materials
Extreme Certified Professional - Extreme Switching study resources

Extreme Certified Professional - Extreme Switching practice questions

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Question 1Extreme Switching Architecture and Hardware Fundamentals

In ExtremeXOS, which command displays the current software version, patch level, and system uptime of a switch?

  1. show version Correct answer.
  2. show running-configuration
  3. show switch detail
  4. show software

Explanation

The show version command reports the ExtremeXOS image version, active patch, and system uptime, making it the standard first check when verifying code level on a switch. The other commands either focus on slot and stack details or on configuration contents rather than image identification.

Question 2Extreme Switching Architecture and Hardware Fundamentals

Which ExtremeXOS command saves the running configuration so it persists after a reboot?

  1. commit configuration
  2. write memory
  3. save configuration Correct answer.
  4. copy running-config startup-config

Explanation

ExtremeXOS uses save configuration to write the running configuration to the primary configuration file used at boot. The other commands are either from other vendor CLIs or not valid ExtremeXOS persistence commands.

Question 3Extreme Switching Architecture and Hardware Fundamentals

On an Extreme Switching stack, what is the role of the node that runs the control plane for all stack members?

  1. The candidate node
  2. The master node Correct answer.
  3. The standby node
  4. The backup node

Explanation

In an ExtremeXOS stack one node is elected master and runs the single control plane for the entire stack, while other nodes forward traffic under its direction. Backup and standby roles provide redundancy for the master but do not own the active control plane.

Question 4Extreme Switching Architecture and Hardware Fundamentals

Which statement describes the purpose of ExtremeXOS stacking with SummitStack technology?

  1. It combines multiple switches into one logical switch managed as a single entity. Correct answer.
  2. It partitions a single switch into multiple independent virtual routing instances.
  3. It bonds multiple physical links between two switches into one logical link.
  4. It synchronizes configuration between two switches that keep separate management planes.

Explanation

SummitStack lets several physical switches operate as one logical switch with a single management and control plane, simplifying operations and adding resiliency. Link aggregation, virtualization partitioning, and configuration synchronization are different features with different goals.

Question 5Extreme Switching Architecture and Hardware Fundamentals

Which port type on an ExtremeXOS switch is used for out-of-band management and is typically placed in a separate management VLAN?

  1. The stacking port
  2. The dedicated management port Correct answer.
  3. The console port
  4. The shared data port

Explanation

The dedicated management port provides out-of-band access for management traffic and is commonly isolated in a management VLAN or VR. Stacking ports carry inter-switch stack traffic and the console port provides local serial access, so neither serves as an IP management interface.

Question 6Extreme Switching Architecture and Hardware Fundamentals

A network designer needs a switch that supports Power over Ethernet for IP phones and access points. Which specification should be confirmed on the Extreme Switching platform?

  1. The number of stacking ports available
  2. The size of the MAC address table
  3. The number of IPv6 routes supported
  4. The PoE budget in watts and supported 802.3 standards Correct answer.

Explanation

PoE capability depends on the switch's power budget in watts and which IEEE 802.3af/at/bt standards it supports, because those determine how many powered devices can be served. Stacking ports, MAC table size, and route capacity do not describe power delivery capability.

Question 7Extreme Switching Architecture and Hardware Fundamentals

Which statement best describes the difference between a fixed-configuration Extreme switch and a modular chassis model?

  1. Fixed models allow adding line cards, while modular models have a fixed port count.
  2. Fixed models have a set port count, while modular models accept line cards for expansion. Correct answer.
  3. Fixed models support stacking, while modular models cannot be stacked.
  4. Fixed models always run a different operating system than modular models.

Explanation

A fixed-configuration switch ships with a defined set of ports, whereas a modular chassis provides slots that accept line cards to scale ports and media types. Both families run ExtremeXOS and both can participate in stacking, so the expansion model is the real distinction.

Question 8Extreme Switching Architecture and Hardware Fundamentals

What is the primary function of the ExtremeXOS primary and secondary configuration files?

  1. They store the boot image and patch files for the switch.
  2. They log syslog messages generated by the switch.
  3. They provide redundant copies of the switch configuration for boot and recovery. Correct answer.
  4. They hold the MAC address table and ARP cache at runtime.

Explanation

ExtremeXOS keeps a primary and a secondary configuration so the switch can boot from a known-good configuration if one copy is unusable. Boot images are stored separately from configuration, and runtime tables and logs are not configuration files.

Question 9Extreme Switching Architecture and Hardware Fundamentals

An engineer wants to verify which slots in a modular Extreme chassis are populated and their operational state. Which command is most appropriate?

  1. show iproute
  2. show version
  3. show vlan
  4. show slot Correct answer.

Explanation

The show slot command reports which slots are populated and the state of each card in a modular chassis. The other commands report software version, VLAN membership, or routing table contents and do not describe slot population.

Question 10Extreme Switching Architecture and Hardware Fundamentals

Which characteristic distinguishes a stack port from a regular front-panel user port on an Extreme switch?

  1. Stack ports can only be used for out-of-band management access.
  2. Stack ports operate only when the switch is in a standalone configuration.
  3. Stack ports carry dedicated inter-switch stack traffic and are not used for user access. Correct answer.
  4. Stack ports are always copper RJ45 ports for user devices.

Explanation

Stack ports are dedicated high-speed links that connect stack members and carry inter-switch stack traffic, so they are not intended for attaching user devices. They can be copper or fiber depending on the model, and they function precisely when the switch is stacked rather than standalone.

Question 11Extreme Switching Architecture and Hardware Fundamentals

What does the ExtremeXOS show edp ports command help an administrator determine?

  1. Which ports are receiving EDP advertisements from neighboring Extreme devices Correct answer.
  2. Which ports are configured as stack ports
  3. Which ports have spanning tree disabled
  4. Which ports have exceeded their error threshold

Explanation

Extreme Discovery Protocol advertises device and port information to neighbors, so show edp ports reveals which local ports are seeing EDP advertisements. It does not report spanning tree state, stack port configuration, or error thresholds.

Question 12Extreme Switching Architecture and Hardware Fundamentals

A switch must forward traffic between VLANs without leaving the device. Which capability is required?

  1. Port mirroring to an analyzer
  2. Layer 2 switching with a single VLAN
  3. Stacking with at least two nodes
  4. IP routing with a VLAN interface per subnet Correct answer.

Explanation

Inter-VLAN forwarding on the switch requires Layer 3 routing with an IP interface configured in each VLAN so the switch can route between subnets. A single Layer 2 VLAN cannot forward between subnets, and stacking or mirroring do not provide routing.

Question 13Extreme Switching Architecture and Hardware Fundamentals

Which statement correctly describes the ExtremeXOS command-line interface hierarchy?

  1. Commands are organized into modes such as user, privileged, and configuration modes. Correct answer.
  2. The CLI only accepts commands entered through a web browser.
  3. All commands are available from a single flat prompt.
  4. Configuration changes require a reboot before they take effect.

Explanation

ExtremeXOS organizes the CLI into modes, moving from user EXEC to privileged EXEC and then into configuration mode where changes are made. Most configuration changes take effect immediately without a reboot, and the CLI is accessible through console, SSH, or Telnet rather than only a browser.

Question 14Extreme Switching Architecture and Hardware Fundamentals

What is the purpose of the ExtremeXOS boot sequence loading a primary image and a secondary image?

  1. To run two operating systems simultaneously for load sharing
  2. To enable stacking of two chassis
  3. To provide a fallback image if the primary image fails to boot Correct answer.
  4. To store configuration backups on the switch

Explanation

The switch boots the selected primary image and can fall back to a secondary image if the primary is missing or fails, improving availability during upgrades. Only one image runs at a time, and images are separate from configuration backups and stacking.

Question 15Extreme Switching Architecture and Hardware Fundamentals

Which factor most directly determines the maximum number of switches that can be combined in an Extreme SummitStack ring?

  1. The size of the routing table
  2. The number of VLANs configured on the stack
  3. The PoE budget of the master node
  4. The platform's supported stack node count and cabling topology Correct answer.

Explanation

The supported stack size depends on the platform's documented node limit and the cabling topology used to connect members, such as a ring for resiliency. VLAN count, routing table size, and PoE budget do not determine how many nodes a stack can contain.

Question 16Extreme Switching Architecture and Hardware Fundamentals

An administrator sees that a newly cabled stack link is not carrying traffic. Which action is the most direct first step to confirm stack port status?

  1. Reboot every stack member simultaneously
  2. Replace the master node
  3. Reconfigure all VLANs on the stack
  4. Check the stack port status and link state with stacking show commands Correct answer.

Explanation

Stacking show commands report stack port link state and configuration, which quickly confirms whether the new link is up and correctly assigned. Rebooting all members, reconfiguring VLANs, or replacing hardware are disruptive actions that should follow, not precede, basic status verification.

Question 17Extreme Switching Architecture and Hardware Fundamentals

Which feature allows an Extreme switch to participate in a redundant Layer 2 topology while preventing loops?

  1. Spanning Tree Protocol Correct answer.
  2. Port mirroring
  3. DHCP relay
  4. Access Control Lists

Explanation

Spanning Tree Protocol detects and blocks redundant paths so a Layer 2 topology can include backup links without loops. DHCP relay, ACLs, and mirroring serve different purposes and do not prevent Layer 2 forwarding loops.

Question 18Extreme Switching Architecture and Hardware Fundamentals

What does the ExtremeXOS show iproute command display?

  1. The ARP cache entries for each VLAN
  2. The status of stack ports
  3. The Layer 3 routing table with destinations and next hops Correct answer.
  4. The list of configured VLANs and their tags

Explanation

The show iproute command displays the routing table, including destination networks and next-hop information used for forwarding. ARP entries, VLAN configuration, and stack port status are reported by separate commands.

Question 19Extreme Switching Architecture and Hardware Fundamentals

A design requires that if the stack master fails, another node assumes control with minimal disruption. What should be configured?

  1. Port mirroring on all stack ports
  2. A backup node with an up-to-date running configuration Correct answer.
  3. A separate spanning tree domain per node
  4. A second management IP on every node

Explanation

Configuring a backup node keeps a synchronized copy of the running configuration so it can take over the master role quickly if the master fails. Multiple management IPs, mirroring, or per-node STP domains do not provide control-plane failover.

Question 20Extreme Switching Architecture and Hardware Fundamentals

Which statement accurately describes the relationship between ExtremeXOS and the underlying switch hardware?

  1. ExtremeXOS is a network operating system that runs across many Extreme Switching platforms. Correct answer.
  2. ExtremeXOS runs only on a single hardware model.
  3. ExtremeXOS is a hardware ASIC family.
  4. ExtremeXOS is a hypervisor for virtual machines.

Explanation

ExtremeXOS is the network operating system shared across a broad range of Extreme Switching platforms, providing consistent CLI and features. It is software rather than a single hardware model, hypervisor, or ASIC family.

Question 21Extreme Switching Architecture and Hardware Fundamentals

An engineer needs to identify the physical port associated with a MAC address learned on a stacked switch. Which command is most useful?

  1. show version
  2. show fdb Correct answer.
  3. show licenses
  4. show slot

Explanation

The show fdb command displays the forwarding database, mapping learned MAC addresses to ports and VLANs, which identifies the port for a given address. Version, slot, and license commands do not report MAC learning information.

Question 22Extreme Switching Architecture and Hardware Fundamentals

Which consideration is most important when choosing between copper and fiber stacking cables for an Extreme stack?

  1. The syslog server address
  2. The routing protocol used on the stack
  3. The number of VLANs configured on the stack
  4. The supported cable type and maximum distance for the platform's stack ports Correct answer.

Explanation

Stack cabling must match the port type and supported distance for the platform, since some stacking ports accept only specific copper or fiber cables and have distance limits. VLAN count, routing protocols, and logging destinations do not constrain cable selection.

Question 23Extreme Switching Architecture and Hardware Fundamentals

A switch reports that its primary configuration file is corrupt at boot. What is the expected recovery behavior in ExtremeXOS?

  1. The switch halts and requires a manual image reinstall
  2. The switch disables all ports until a new configuration is uploaded
  3. The switch boots using the secondary configuration file Correct answer.
  4. The switch automatically formats the internal flash

Explanation

ExtremeXOS maintains a secondary configuration so the switch can boot from it when the primary configuration is unusable, preserving service. It does not require an image reinstall, format flash automatically, or disable all ports as a recovery mechanism.

Question 24Extreme Switching Architecture and Hardware Fundamentals

Which scenario best justifies deploying a modular Extreme chassis rather than a fixed-configuration switch?

  1. A lab needing one PoE device
  2. A core location requiring high port density and mixed media that may grow over time Correct answer.
  3. A branch office needing a single uplink
  4. A small wiring closet needing twelve access ports

Explanation

A modular chassis is justified when high port density, mixed media, and future expansion are needed, because line cards can be added as requirements grow. Small fixed port counts, a single uplink, or a single PoE device are better served by fixed switches.

Question 25Extreme Switching Architecture and Hardware Fundamentals

An administrator plans to upgrade ExtremeXOS on a stack. Which practice best reduces risk to the control plane?

  1. Delete the secondary image before upgrading
  2. Upgrade all nodes at once with no backup configuration
  3. Disable stacking before the upgrade
  4. Verify image compatibility, save configuration, and follow the documented stack upgrade procedure Correct answer.

Explanation

A safe stack upgrade confirms image compatibility, saves the configuration, and follows the vendor-documented procedure so master and member images remain consistent. Upgrading all nodes blindly, deleting the secondary image, or disabling stacking increases risk and can cause outages.

Question 26Extreme Switching Architecture and Hardware Fundamentals

An Extreme switch is described as having a non-blocking switching architecture. What does this mean for traffic forwarding?

  1. Traffic is forwarded only after the control plane approves each flow.
  2. The switch buffers frames until the CPU schedules each one in turn.
  3. Every port can simultaneously transmit and receive at line rate without internal contention. Correct answer.
  4. The switch guarantees zero latency regardless of frame size or load.

Explanation

A non-blocking architecture means the internal switching fabric provides enough bandwidth for all ports to operate at line rate at the same time, so no port starves another under full load. It does not eliminate latency, since store-and-forward and serialization delays still apply, and it does not require per-flow CPU involvement.

Question 27Extreme Switching Architecture and Hardware Fundamentals

A network engineer is selecting an Extreme switch model and needs to know which one provides high-density line cards in a chassis with redundant management modules. Which product family should be evaluated?

  1. The ExtremeSwitching X8 chassis series Correct answer.
  2. The ExtremeCloud IQ subscription tier
  3. The SummitStack stacking cable kit
  4. The ExtremeXOS command-line interface

Explanation

The ExtremeSwitching X8 is a modular chassis family that accepts line cards and supports redundant management modules, making it the appropriate choice when high-density chassis switching is required. Stacking cables, the CLI, and cloud subscriptions are not chassis hardware platforms.

Question 28Extreme Switching Architecture and Hardware Fundamentals

An administrator wants to confirm which ExtremeXOS software image will be loaded the next time a switch reboots, without rebooting it now. Which command provides this information?

  1. show boot Correct answer.
  2. show switch
  3. show configuration
  4. show version

Explanation

The show boot command displays the configured primary and secondary image selections and indicates which image will be used at the next boot. show version reports the currently running image, not the next-boot selection, and show configuration displays the running configuration.

Question 29Extreme Switching Architecture and Hardware Fundamentals

A fixed-configuration Extreme switch has front-panel ports labeled as combo ports. What capability do these ports provide?

  1. They combine multiple physical links into one logical trunk.
  2. They provide console access for out-of-band management.
  3. They offer a choice of copper or fiber media for the same port number. Correct answer.
  4. They carry only stacking traffic between chassis.

Explanation

Combo ports pair a copper RJ-45 interface and a fiber interface under one port number, and the administrator selects which media type is active. They are not dedicated stacking ports, console ports, or link aggregation features, although the selected interface can participate in those functions.

Question 30Extreme Switching Architecture and Hardware Fundamentals

An engineer is comparing a stack of Extreme switches with a single modular chassis and wants to understand how the data plane is affected when an additional stack member is added. Which statement is accurate?

  1. Stack members share a single management IP address but each member must run a different ExtremeXOS image.
  2. All stack members forward traffic through the master's switching fabric, so adding members does not increase total capacity.
  3. Adding a member requires a reboot of every existing member because the stack database is rebuilt from scratch.
  4. The primary/master coordinates control while members use their local forwarding hardware; adding a member does not by itself increase the rate of existing stack links. Correct answer.

Explanation

The primary/master manages the stack control functions, while member hardware supports distributed forwarding. Traffic that must reach another member uses the stack interconnect. Adding a node can add ports and local switching resources without automatically increasing existing stack-link speeds or removing interconnect bottlenecks.

Question 31Initial Configuration, Management Access, and Software Updates

On an ExtremeXOS switch, which command saves the running configuration so that it persists across a reboot?

  1. save configuration Correct answer.
  2. write memory
  3. copy running-config startup-config
  4. commit config

Explanation

ExtremeXOS persists configuration with the save configuration command, which writes the current running configuration to the primary configuration file on the switch. Without it, changes live only in the running configuration and are lost on reload.

Question 32Initial Configuration, Management Access, and Software Updates

Which command displays the current switch configuration on an ExtremeXOS device?

  1. show configuration Correct answer.
  2. display current-configuration
  3. show startup
  4. show running-config

Explanation

ExtremeXOS uses show configuration to display the active configuration in a form that can be re-applied. This is the canonical way to inspect what is currently configured on the switch.

Question 33Initial Configuration, Management Access, and Software Updates

By default, which management interface on an ExtremeXOS switch is enabled and reachable for initial configuration?

  1. The dedicated out-of-band management port
  2. The front-panel console port Correct answer.
  3. The default VLAN with an IP address
  4. The SSH server on VLAN 1

Explanation

The console port is the default out-of-band access method and is available before any IP configuration exists. The dedicated management port and any VLAN interfaces must be configured before they can be used.

Question 34Initial Configuration, Management Access, and Software Updates

Which command creates a local user account named admin with full administrative privileges on ExtremeXOS?

  1. create account admin privilege 15
  2. set user admin password admin
  3. configure account admin admin
  4. create account admin admin Correct answer.

Explanation

The create account command takes the username and the password as its two arguments, so create account admin admin creates the user admin with password admin. The account is granted administrative privileges appropriate to the platform.

Question 35Initial Configuration, Management Access, and Software Updates

Which command enables SSH access on an ExtremeXOS switch?

  1. enable ssh server
  2. configure ssh enable
  3. ssh enable
  4. enable ssh2 Correct answer.

Explanation

On ExtremeXOS the SSH server is enabled with enable ssh2, which starts the SSH version 2 server. SSH access also requires an IP address on a VLAN or management interface and a valid user account.

Question 36Initial Configuration, Management Access, and Software Updates

Which command assigns an IP address to the default VLAN on an ExtremeXOS switch?

  1. configure vlan Default ipaddress 10.0.0.1/24 Correct answer.
  2. interface vlan Default ip address 10.0.0.1/24
  3. ip address 10.0.0.1/24
  4. set vlan Default ip 10.0.0.1 255.255.255.0

Explanation

ExtremeXOS uses configure vlan <name> ipaddress <address>/<prefix> to assign an IPv4 address to a VLAN interface. The command must be issued in the context of the VLAN that will carry management traffic.

Question 37Initial Configuration, Management Access, and Software Updates

Which protocol should be disabled on a switch to prevent unauthorized users from discovering and altering configuration over an insecure cleartext channel?

  1. SNMPv3
  2. RADIUS
  3. Telnet Correct answer.
  4. SSH2

Explanation

Telnet sends credentials and configuration in cleartext, so it should be disabled in favor of SSH. SNMPv3 and RADIUS are not cleartext management channels, and SSH2 is the secure replacement.

Question 38Initial Configuration, Management Access, and Software Updates

Which command disables Telnet access on an ExtremeXOS switch?

  1. no telnet
  2. disable telnet server
  3. configure telnet disable
  4. disable telnet Correct answer.

Explanation

ExtremeXOS disables the Telnet server with the command disable telnet. This removes the cleartext remote-access service while SSH can remain enabled for secure administration.

Question 39Initial Configuration, Management Access, and Software Updates

An administrator wants to load a new ExtremeXOS image from a TFTP server. Which command is used?

  1. download image 10.0.0.5 summitX-.xos Correct answer.
  2. upload image
  3. install image tftp
  4. copy tftp image

Explanation

The download image command retrieves an XOS image file from a TFTP server into the switch's image storage. After the download completes, the image is selected with use image and the switch is rebooted.

Question 40Initial Configuration, Management Access, and Software Updates

After downloading a new ExtremeXOS image, which command selects it as the image to boot on the next reboot?

  1. set boot image <image-name>
  2. use image <image-name> Correct answer.
  3. boot image <image-name>
  4. select image <image-name>

Explanation

The use image command designates which image file the switch will boot at the next restart. The selection is confirmed with show switch before rebooting.

Question 41Initial Configuration, Management Access, and Software Updates

Which command displays the currently running ExtremeXOS image and the image selected for the next boot?

  1. show boot
  2. show switch Correct answer.
  3. show image
  4. show version

Explanation

show switch reports the primary and secondary image slots, the image currently running, and the image selected for the next boot. It is the standard command to verify an upgrade before rebooting.

Question 42Initial Configuration, Management Access, and Software Updates

Which command displays the contents of the switch's configuration file storage and available slots?

  1. ls
  2. show config
  3. show configuration files
  4. show file Correct answer.

Explanation

show file lists files in the switch's file system, including configuration files and their sizes. It is useful to confirm that a saved configuration exists before or after an upgrade.

Question 43Initial Configuration, Management Access, and Software Updates

Which command copies the primary configuration to the secondary configuration slot on ExtremeXOS?

  1. save configuration secondary
  2. copy configuration primary secondary Correct answer.
  3. copy primary.cfg secondary.cfg
  4. backup configuration

Explanation

ExtremeXOS uses copy configuration <source> <destination> to duplicate configuration files between slots. Keeping a secondary copy provides a fallback if the primary is corrupted.

Question 44Initial Configuration, Management Access, and Software Updates

What is the purpose of the configure snmp add community command on an ExtremeXOS switch?

  1. To define an SNMP community string and its access level Correct answer.
  2. To enable SNMP traps only
  3. To set the SNMP engine ID
  4. To configure an SNMP view

Explanation

configure snmp add community creates an SNMP community with a name and access permissions, controlling how management stations can read or write via SNMP. It is the basic step for enabling SNMP access.

Question 45Initial Configuration, Management Access, and Software Updates

Which command enables the DHCP client on the management port of an ExtremeXOS switch?

  1. configure mgmt dhcp-client enable
  2. enable dhcp-client Correct answer.
  3. enable dhcp vlan mgmt
  4. set mgmt dhcp

Explanation

ExtremeXOS uses enable dhcp-client to start the DHCP client on the management interface, allowing the switch to obtain an address dynamically. The assigned address can be verified with show management.

Question 46Initial Configuration, Management Access, and Software Updates

Which command displays the IP address and status of the management port?

  1. show interface mgmt
  2. show management Correct answer.
  3. show ip interface
  4. show mgmt

Explanation

show management reports the management port's address, link state, and configuration. It is the standard way to verify out-of-band management connectivity.

Question 47Initial Configuration, Management Access, and Software Updates

Which command creates a VLAN named Users on an ExtremeXOS switch?

  1. set vlan Users
  2. create vlan Users Correct answer.
  3. configure vlan Users create
  4. vlan Users

Explanation

The create vlan command creates a VLAN and assigns it a tag if specified. After creation, ports are added and an IP address may be configured to make it routable.

Question 48Initial Configuration, Management Access, and Software Updates

Which command adds ports 1 through 4 to VLAN Users on an ExtremeXOS switch?

  1. configure vlan Users add ports 1-4
  2. configure vlan Users add ports 1 2 3 4 tagged
  3. configure vlan Users add ports 1:1-1:4
  4. configure vlan Users add ports 1-4 untagged Correct answer.

Explanation

configure vlan Users add ports 1-4 untagged adds the specified ports to the VLAN as untagged members. Untagged membership is required for access ports connected to end devices.

Question 49Initial Configuration, Management Access, and Software Updates

Which command creates a link aggregation group with LACP enabled on ports 1 and 2?

  1. configure lag 1 lacp ports 1-2
  2. enable lag 1 ports 1,2
  3. enable sharing 1 grouping 1,2 algorithm address-based lacp Correct answer.
  4. create lag 1 ports 1,2 lacp

Explanation

ExtremeXOS configures LACP-based link aggregation with enable sharing <master-port> grouping <ports> algorithm address-based lacp. The first port in the grouping becomes the master port of the logical link.

Question 50Initial Configuration, Management Access, and Software Updates

Which command displays the current date and time and the configured NTP servers on an ExtremeXOS switch?

  1. show ntp Correct answer.
  2. show time
  3. show date
  4. show clock

Explanation

show ntp reports NTP configuration and synchronization status, while show clock displays the current time. Together they verify that time synchronization is working.