Free JN0-253 practice test: 30 questions with answers

Mist APs are cloud-managed, and they connect to the Mist cloud for configuration, firmware and telemetry. The other components do not hold the AP's management configuration.

SLEs measure user experience against defined targets, such as successful connections and throughput, for wireless and wired services. Spanning Tree priority, native VLANs and lease times are not experience measures.

Marvis is the Mist virtual network assistant that uses AI to find and explain issues and suggest or automate actions. A PDF, spreadsheet and routing table do not provide conversational analysis.

Mist automates RRM, adjusting channels and power based on the RF environment to reduce interference. Manual per-AP settings do not adapt, WAN designs are unrelated, and static MAC tables do not manage radio.

Mist organizes deployments as an organization containing sites, with templates and settings applied across them. VLANs, client operating systems and room-level AP counts are not the grouping hierarchy.

Claiming devices in the portal with the claim code assigns them to the right organization and site, which supports zero-touch style onboarding. Manual console configuration, vendor pre-configuration and controllers are not required for cloud-managed APs.

Mist allows firmware upgrades to be scheduled for chosen times, which reduces disruption. Noon reboots, manual copying and disabling updates do not meet the requirement.

Mist devices send telemetry to the cloud, which powers insights, and they are managed through the cloud rather than requiring a local controller per site. Mist does not need a server for every access point, telemetry is sent to the cloud, and configuration updates continue after onboarding.

Client events and details show the authentication sequence and failure reasons for each connection. Spanning tree summaries, OSPF databases and printer pages do not show wireless client authentication.

802.1X authentication uses a RADIUS server, which the WLAN configuration references so that the APs can forward authentication requests. Console ports, DNS servers and UPS devices do not authenticate wireless users.

A separate WLAN mapped to an isolated network keeps guest traffic away from corporate resources while using the same APs. Shared passwords, open access to corporate VLANs and isolated switches do not deliver the required separation.

More access points and well-planned power and channels spread client load and reduce contention. Fewer APs, maximum power everywhere and disabling 5 GHz each make contention or capacity worse.

A transition mode supports legacy WPA2 devices while preferring WPA3 for newer clients, which balances compatibility and security. Removing encryption and WEP weaken security, and single-key sharing does not improve the situation.

RRM and site survey results guide placement and channel choices, and the higher bands offer more capacity where supported. Same-channel APs cause co-channel interference, disabling 5 GHz reduces capacity, and maximum power everywhere increases interference.

The client's authentication events and failure reason show where the connection failed, such as a credential or RADIUS problem. Printer status, cable colours and unrelated lease times do not explain the wireless failure.

The 6 GHz band offers more spectrum and wider channels, which increases capacity for supported clients. 2.4 GHz has fewer, narrower channels and is more crowded, while 900 MHz and AM radio are not Wi-Fi bands.

Port profiles and templates assign VLANs and settings consistently based on port roles, which scales well. Manual per-port changes are error-prone, disabling VLANs removes segmentation, and printer addresses are not switch port settings.

A trunk port carries multiple VLANs with tagging, which is needed for an access point that serves several VLANs. Access ports carry one VLAN, routed ports do not carry VLAN tags, and disabled ports pass no traffic.

Port status and port profiles show whether the link and configuration are correct, and wired client events with VLAN assignment show what happened to the client. Access point channel plans and wireless SSID history do not describe a wired connection, and toner levels are unrelated.

Access mode assigns a single VLAN to the port for an end device without tagging. Trunk mode carries many VLANs, routed mode uses IP addressing on the port, and dynamic desirable with no VLAN does not place the device correctly.

Error counters, the physical link and the port's event history point to the cause of flapping. Replacing an unrelated AP, disabling management and changing SSIDs do not address the port.

Templates and port profiles apply the same settings to many devices and reduce errors. Manual changes, email copies and paper sheets are error-prone and inconsistent.

802.1X makes a port authenticate a device before granting network access. Storm control limits broadcast traffic, native VLANs define untagged traffic, and EtherChannel bundles links.

SRX firewalls and Session Smart Routers provide branch routing, security and VPN capabilities. An access point, patch panel and USB adapter do not provide routing and firewall functions.

Application-aware path selection chooses the best path for each application based on link performance. A single static route, VLANs and hubs do not evaluate link quality for applications.

An IPsec VPN encrypts traffic over the internet, and redundant links with failover keep the tunnel available. Unencrypted trunks, console cables and printer queues do not provide encrypted WAN connectivity.

IPsec provides encryption and authentication for traffic across untrusted networks. ARP resolves addresses, DHCP assigns addresses, and NTP synchronizes time.

Primary and backup routes with different metrics or priorities select the preferred link and fail over when needed. Identical default routes share traffic, no default route leaves the branch without internet access, and VLAN trunks are not a WAN failover mechanism.

A remote access VPN authenticates the user and encrypts traffic before granting access to corporate resources. Open Wi-Fi, anonymous FTP and printed diagrams do not provide authenticated, encrypted access.

Session-based path selection steers each session over the best available path, which improves application performance. MAC addressing, VLAN hopping and NAT64 do not select WAN paths per session.