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Disabling Layer 3 routing on the preferred router would prevent it from forwarding user traffic even if it obtained the HSRP active role. The problem is that a higher-priority standby does not automatically displace an already healthy active member. A preemption setting can change election behavior; shutting off routing would defeat the redundancy goal.

HSRP group identity and OSPF local process numbers are independent configuration domains. Matching them has no general effect on the decision to preempt an active virtual gateway owner. OSPF might supply upstream reachability, but it does not set HSRP preemption implicitly through process-number equality. Focus on the first-hop redundancy election settings.

A DHCP server assigns host addresses and options such as the virtual default gateway, but its own unrelated priority does not control which HSRP participant becomes active. DHCP leases can continue to advertise the same virtual gateway while HSRP role ownership changes. Adjust the HSRP group's priority and preemption policy, not an imagined DHCP election value.

SSH requires a functioning IP path to the switch's reachable management address, as well as the configured SSH service and authorized login. The scenario explicitly states that management VLAN configuration has broken that connectivity. Retrying the same remote SSH destination therefore cannot restore access until the underlying Layer 2 or management addressing problem has been corrected through another channel.

DNS TXT records store arbitrary text associated with a domain name; querying one does not issue a configuration recovery command to a Catalyst switch. Even a correctly configured DNS resolver cannot substitute for a physical or out-of-band management session. The lost management VLAN is a switch connectivity problem, not a hostname lookup that triggers factory reset.

Joining an ordinary employee wireless network gives a device wireless network connectivity, not privileged access to a switch whose management VLAN is unreachable. It also depends on the WLAN being functional and on management security policy permitting the traffic. A radio association is not the dedicated recovery connection the administrator needs to inspect or repair the local switch configuration.

Spanning-tree root election is determined by the lowest eligible bridge identifier, using priority and MAC-related fields within a Layer 2 tree instance. It is not encoded by an asterisk on a router's IPv4 route-table line. The shown entry names an IPv4 default prefix and next hop, so diagnosing the root switch requires separate STP commands.

OSPF-learned routes are identified by IOS route codes such as O or O E1/E2, not the static code S. A route learned from another area may have additional OSPF notation, but this entry states a configured static path. The star does not change its protocol origin or indicate that an external LSA has been received.

The 0.0.0.0/0 mask contains zero significant destination-prefix bits, allowing a fallback match to any IPv4 destination. It does not describe the number of usable host addresses in a subnet, nor mean that the route carries no traffic. The router can forward to the listed next hop when the gateway and next-hop resolution are valid.

A static route chooses the Layer 3 next hop for destination traffic and cannot repair a physical Ethernet pair that tests open. The negotiated link speed reflects the condition and capabilities of the copper PHY path, not routing-table configuration. Adding another next hop might change network reachability after the link comes up, but it leaves this damaged cable unchanged.

DNS servers translate names into records and do not determine how many Ethernet copper pairs are intact. A faulty DNS setting can make applications fail name resolution despite a healthy link, which is a different symptom. Here the interface is negotiating at 100 Mb/s and a cable test identifies an open pair, making physical repair the relevant action.

Storm control limits selected broadcast, multicast, or unknown-unicast traffic when configured thresholds are exceeded. It does not restore electrical continuity of an open conductor or establish gigabit-capable copper signaling. Disabling that protection could increase vulnerability to excessive Layer 2 traffic while leaving the observed 100 Mb/s physical negotiation problem completely unresolved.

The login authentication command can reference an AAA method list, but naming an unconfigured method without a working local fallback is not the direct solution specified. The device has a local user database and no central AAA service or provided valid method list. If AAA lists are later configured, they must be applied deliberately and verified for an authorized fallback.

Telnet transports an interactive CLI without SSH's encrypted channel, and omitting login checks would also defeat the request to authenticate individual users. A local username database is useful only when VTY authentication invokes it. Restricting remote access to insecure Telnet while suppressing authentication would introduce new security problems instead of enforcing accountability.

Using no login on the VTY lines suppresses the line's expected password challenge instead of checking each connecting administrator against the local database. That is directly contrary to the requirement for individual accounts and auditability. Access controls and transport restrictions would still be necessary, but they do not make an unauthenticated VTY design an acceptable replacement.

A temporary management control-plane disconnection does not inherently command every hardware switch to erase its MAC address table and IP forwarding information. Local learning or programmed forwarding can continue according to the device architecture and installed state. Tables may age or require new control-plane programming over time, but immediate universal removal is not a standard consequence of controller unreachability.

Ethernet switching hardware does not require a continuous controller-management session merely to remain electrically powered. A switch may keep existing data forwarding active while management visibility or policy distribution is impaired. Power failure, explicit shutdown and loss of a required fabric control function are separate faults; the scenario states only a temporary management connectivity loss.

A controller API is used by applications and management systems to request information or policy changes, not to serve as the only hop carrying every user packet. Typical switching and routing traffic remains in device forwarding ASICs or other local data-plane resources. Treating an API outage as mandatory redirection of all packets confuses orchestration with packet transmission.

ARP resolves IPv4 next-hop addresses to Layer 2 hardware identities on the local segment; it does not provide a reliable authenticated file transfer session or image repository. The router may use ARP indirectly to reach its file server on a local link, but ARP messages themselves cannot carry a large IOS software image across a WAN.

LLDP advertises directly connected device and interface identity using Layer 2 discovery messages. It is useful for topology inventory but provides no session-based transfer, directory browsing or authenticated large-file download operation. Even if LLDP confirms the server-facing link, another application protocol is needed to fetch and verify the software image.

TFTP is a simple UDP-based file-transfer method that is sometimes useful in isolated recovery or provisioning networks, but it does not inherently encrypt content or provide the requested authenticated session capabilities. Assuming that TFTP protects a router image in transit can expose the transfer to interception or modification. Use a secured management path and a protocol that meets the image-management requirements.

A /24 aggregate covers.0 through.255 and is much broader than the two desired adjacent /28 networks. It could attract traffic for unrelated destinations and would not satisfy the least-broad summary requirement. Summarization should combine only prefixes sharing the necessary high-order bits, not automatically select the entire /24.

The first /28 covers.128 through.143, but it omits the second /28 at.144 through.159. Advertising only the lower subnet is not an aggregate of both networks. A correct single route must increase the host-bit span by one so both adjoining blocks are included.

A /25 starting at.128 covers.128 through.255, much larger than the combined 32-address range needed. While it contains both component networks, it includes several additional /28 blocks, violating the least-broad constraint. Prefix aggregation should select a /27 boundary aligned at.128.

RADIUS provides centralized authentication, authorization and accounting when the WLAN design uses it, but the scenario states the guest SSID uses PSK and is mapped to the wrong VLAN. Disabling every RADIUS server would not change the VLAN mapping. It could instead interrupt unrelated enterprise wireless authentication services that correctly rely on those servers.

AP transmit power influences radio coverage, interference and client signal strength. It has no role in selecting which wired VLAN a controller places guest client traffic into after association. Increasing RF power could worsen co-channel interference while leaving the mistaken finance-segment mapping and the resulting security exposure unchanged.

A trunk's native VLAN controls handling of untagged traffic on that particular 802.1Q link and should be coordinated with the peer. Making all enterprise trunks native finance VLAN would unnecessarily alter a broad wired design and could expose more untagged traffic to a sensitive segment. It does not correctly express the guest WLAN's intended policy association.

FTP control sessions use TCP port 21 for file-transfer commands rather than time-sensitive audio datagrams. FTP's reliable session semantics and retransmission behavior do not provide the desired low-stall real-time transport for voice samples. File movement may use TCP deliberately, but sending a live voice stream through an FTP control channel would be the wrong application protocol.

TCP's reliable, ordered stream can require recovery of missing bytes before delivering later stream data to the application. That is valuable for transactions or exact file content but can increase delay when an audio sample becomes stale. The question specifically rules out transport retransmit stalls, so selecting TCP for mandatory blocking delivery contradicts the real-time design constraints.

LLDP is a local Layer 2 discovery protocol used by compatible devices to advertise port and chassis information to adjacent peers. It does not transport a live application voice stream over an IP WAN, and its frames are not forwarded end-to-end like ordinary media packets. Use a valid application transport instead of a neighbor-discovery exchange.

A DNS query may assist in resolving an authentication service hostname, but performing it does not prove that a person possesses a second independent factor. An attacker with the password could issue the same lookup. The design requires evidence from a separate authenticator, not merely an additional network request during login.

Two usernames associated with identical shared passwords are not two independent authentication factors. They may also undermine individual accountability and complicate credential management. Multiple account identifiers remain knowledge or identity labels rather than a possession or inherent factor. A stolen shared password could still satisfy both prompts in the proposed design.

Entering the same password twice repeats one knowledge secret; it does not add meaningful independence against phishing or password compromise. Even asking for a second password is still within the knowledge category and may not meet a policy that requires distinct factor types. The stated hardware token provides a different proof from password knowledge.