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A switch still needs appropriate MAC learning for ordinary client forwarding. DHCP snooping examines DHCP message direction and ingress trust state; broadly disabling MAC learning would harm client connectivity without explicitly enforcing authorized DHCP server behavior.

Allowing unsolicited server replies from untrusted endpoints defeats the primary anti-rogue-server purpose. Clients might receive a malicious router or DNS server. The feature should classify client-facing ports as untrusted and allow server-originated responses only from authorized sources.

NAT changes IP address translation, not the Layer 2 trust decision required to stop rogue DHCP offers. It could even hide the origin of the unauthorized response. DHCP snooping is designed to discard the wrong message on an untrusted ingress port.

A multiaccess adjacency uses a consistent DR/BDR election; forcing duplicate roles is not a repair for mismatched Hello or area parameters.

OSPF cost determines route preference, not router identity. Cost adjustments do not change the router ID embedded in LSAs and neighbor relationships. Each router needs a distinct configured ID or an otherwise unique eligible address selected by the process.

Routers sharing a link must agree on OSPF area to form the intended neighbor relationship. Changing one end to another area would add a mismatch. The duplicate router ID is the actual stated problem and should be resolved directly.

The complete 10/8 block is private space, widely used inside enterprises and labs. Treating 10.7.5.20 as public may lead to routing or NAT mistakes. The 172.16.90.10 address also falls inside the 172.16–172.31 private range.

RFC 1918 includes 172.16.0.0 through 172.31.255.255, which contains 172.16.90.10. Private addressing is defined by prefixes, not a single familiar 192.168 pattern. Check masks and documented ranges precisely.

Private address blocks are not normally routed across the public Internet. An enterprise may connect them using VPNs or translate traffic at its boundary. Their IPv4 syntax does not make them public addresses, and using them as Internet endpoints requires additional design.

The trunk must distinguish multiple VLANs over one physical link. If every VLAN were untagged there would be no VLAN identity to separate them. Non-native VLAN 55 traffic normally carries the 802.1Q tag; only the designated native VLAN is untagged under default behavior.

The VLAN identifier is a Layer 2 encapsulation field carried in the Ethernet frame header. Subnet masks are IP addressing constructs and cannot mark Ethernet frames for membership in VLAN 55. Routing and switching use different header information.

A tagged frame is classified by the 802.1Q VLAN ID, not by the native VLAN reserved for normally untagged traffic.

A longer lease only affects clients that have already received an address. New guests still cannot deliver a broadcast to a different subnet when the helper is missing. Relay configuration is the prerequisite for initial lease discovery across the routed boundary.

The relay point needs to observe the client's local DHCP broadcast. The server is already on another network and cannot hear the guest VLAN's broadcast by default. Configure the helper on the client-facing VLAN 55 routed interface.

A pool existing elsewhere does not automatically cross a routed subnet boundary; configure a suitable SVI relay or DHCP service path.

SNMP polling gathers state but is not a repeatable device configuration deployment or desired-state reconciliation system.

Screenshots are not executable, versioned task definitions and leave each engineer to interpret and type device changes. That preserves manual drift and makes rollback difficult. Use reviewed playbooks with a documented inventory and result verification.

Terraform is best known for declarative provisioning of infrastructure resources with providers and state. It can manage some device configuration through providers, but the specifically described playbook-style task execution and agentless device command workflow maps more directly to Ansible. Using state as a typing script would miss that distinction.

This would match every host in the /24 and could redirect unrelated application traffic through the special WAN. The request is restricted to one specific monitoring IP, so the static route should use a /32 host prefix rather than the whole subnet.

A default route applies to destinations without any more-specific match and cannot express a one-host exception by itself. It might also change general Internet forwarding. Use a specific /32 route so the exception affects only the named monitoring host.

A /16 includes a much larger address block than the specified /24, potentially capturing many additional networks. It is less specific than the existing /24 for ordinary addresses and still does not precisely document the single-host exception. A /32 is required.

Authorization decides what a verified principal is allowed to do, such as a permitted command set or interface scope. The scenario describes checking who the person is before those privileges are assigned. A successful credential check alone should not imply unrestricted configuration rights.

Accounting produces records of access sessions and actions for audit or billing. While a login event can be logged, the credential validation itself is the authentication step. Confusing these terms can lead to a design with audit records but no actual identity verification.

NAT maps IP addresses and possibly ports at a network boundary; it does not validate a human administrator's username or secret. Router management security requires an AAA identity mechanism followed by separate authorization and accounting as needed.

This rendering has nine hextets rather than eight, exceeding the fixed 128-bit IPv6 address width. The original has 2001, db8, five zeros and 42. Correct compression makes the value shorter without adding an additional group.

Without a double-colon abbreviation the value contains too few hextets and lacks a legal way to infer the omitted zero groups. IPv6 text needs eight hextets after expansion; only :: provides the documented contiguous-zero compression.

Using the double-colon twice makes expansion ambiguous because the address no longer states how many zero hextets belong to each omission. IPv6 allows at most one :: run. Compress the one contiguous zero sequence between db8 and 42.

STP normally selects one root port on each non-root bridge for a given VLAN and prevents loops by putting alternate redundant paths into a nonforwarding role. Having two forwarding root ports without the appropriate topology mechanism would defeat loop prevention.

The root bridge has designated ports on its active segments; non-root bridges select root ports to reach it. Switch B is explicitly not the root and therefore needs a best upstream root port. The lower-cost Gi1/0/1 fulfills that role.

STP path cost is a cost to minimize when selecting the root port. A lower cost generally reflects a better path given the configured speeds and costs. Cost 19 loses to cost 4 with all other factors equal; higher is not preferred.

Hello/dead timers are additional parameters that normally must be compatible. Creating a timer mismatch would introduce another obstacle while leaving the area IDs different. Fix the identified area mismatch and keep the already matching timers.

OSPF interface cost influences route selection after adjacencies and LSDB exchange. It does not permit neighbors in different areas on the same link to establish adjacency. No route metric can correct a mismatch in the area field of neighbor Hellos.

Layer 2 connectivity can carry protocol packets but cannot make OSPF neighbors form when their required control-plane parameters are incompatible.