Cisco 200-301 Bundle

A root port is the path a nonroot bridge uses to reach the selected root. The actual root bridge is already the path origin and has no upstream root port.

That would eliminate the root’s ability to forward ordinary LAN traffic. STP prevents loops through selective port roles, not by suppressing every active root-bridge port.

Alternate roles are redundant paths at STP, not a prerequisite for Layer 3 OSPF neighbor relationships. A root bridge normally provides designated forwarding paths to downstream segments.

An OSPF area role controls route advertisement between routing areas, not access switchport STP transition delay. The symptom occurs before the host finishes initial Layer 2 forwarding.

STP prevents Layer 2 loops when redundant paths exist. Disabling the protocol campus-wide is unsafe when only one validated end-host edge port needs faster transition.

Root Guard prevents unwanted downstream root takeover but does not substitute for PortFast edge transition. The control targets a different condition: superior BPDU reception.

Root Guard specifically blocks superior root claims using root-inconsistent behavior; its triggering behavior is not identical to BPDU Guard’s edge-port protection.

Turning off STP removes the loop-prevention mechanism when a bridge loop is suspected. It would increase exposure rather than enforce edge-port policy.

BPDUs are Layer 2 spanning-tree frames and are unaffected by the host’s IPv4 mask. Port-level STP protection is required.

That describes the protection purpose of BPDU Guard, not Loop Guard. Loop Guard responds to missing expected BPDU information on designated roles where a loop could arise.

Loop Guard does not elect a new root by rewriting bridge priority. It guards state transition when BPDUs unexpectedly cease arriving.

A physical fault and a bridging role cannot be converted to IP routing by Loop Guard. The feature prevents unsafe STP state, not transceiver repair.

The IP routing table reports Layer 3 routes, not the root-port role of a particular Layer 2 spanning-tree VLAN. OSPF metrics cannot substitute for STP path cost output.

This command shows VLAN inventory and access port membership, not the complete STP BPDU-derived path comparisons. A trunk can carry the VLAN while its STP role remains alternate.

STP path cost is a primary comparison criterion for root port selection. Port IDs are later tie-breakers when earlier root and cost information ties.

A designated role identifies its topology position, but RSTP state can evolve during synchronization and topology change. The role label alone does not prove the port is currently forwarding.

RSTP can block data frames on a healthy link to maintain a loop-free topology. A physical or administrative shutdown requires separate interface-status evidence.

ARP records address resolution for IPv4 neighbors. It does not report spanning-tree state transitions for an individual VLAN port.

The VLAN ID is an extension component of the effective bridge identifier, not the entire configurable base priority. Setting priority to 30 is not the required remedy.

IP subnet masks and their host counts are unrelated to the STP bridge identifier format. The valid bridge priority increments are determined by the spanning-tree encoding.

OSPF route metrics and Layer 2 bridge priorities are separate settings. Neither the 5000 value nor the 4096 increment requirement comes from OSPF.

Sniffer mode captures on-channel traffic for troubleshooting and typically sacrifices normal client-serving behavior. The requirement is production client service.

A rogue detector has a specialized security-monitoring role rather than providing ordinary WLAN client association. The site requires a client-serving local AP.

A monitor-mode AP is used to observe RF conditions and suspicious wireless activity. It is not the right setting for an AP whose primary function is serving employee clients.

An SSID identifies a wireless service but does not encode the subnet allocation. The actual VLAN and relay design determines which scope responds.

Sniffer mode is for 802.11 capture rather than ordinary client service. It does not replace the configured client VLAN and DHCP forwarding path.

Authentication can succeed while downstream VLAN mapping or DHCP forwarding fails. Removing encryption weakens security and does not correct the client data path.

An AP radio mode change is not an OSPF route-area transition. The loss of client service directly follows the radio’s new non-client-serving role.

A monitor role does not automatically negotiate a different WLAN PSK for clients. The core change is that the AP is not operating as a normal serving radio.

Normal MAC-table capacity is independent of the selected AP mode. The mode change explains why associations stopped without requiring a permanent table exhaustion event.

If their data path requires the controller across the failed link, connectivity may not survive. A proper design distinguishes central from local switching.

DNS can locate services but does not define wireless data forwarding or local authentication behavior during controller loss. That is a WLAN mode design choice.

A passive hub is not a supported wireless survivability mode. This would not specify valid controller-disconnected WLAN operation.