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The exhibit shows an interface configured as trusted for Dynamic ARP Inspection. In a normal access-layer design, trusted DAI ports are not user-facing ports. They are uplinks or infrastructure-facing links where valid ARP replies may arrive, typically toward a router, distribution switch, or another trusted network device. End-user devices such as PCs and ordinary DHCP clients should stay untrusted so the switch can validate their ARP traffic against the DHCP snooping binding database. If an untrusted host sends forged ARP information, DAI can drop it before it poisons neighboring hosts. That is why the device connected to FastEthernet0/1 is expected to be a router in this scenario. Cisco CCNA 200-301 v1.1 places this under IP Services and access-layer security behavior because DHCP snooping and DAI work together to protect Layer 2 addressing. The clue is the ip arp inspection trust interface setting. A trusted port should face infrastructure, not an endpoint, so C is correct.

DHCP dynamically leases IP configuration to clients, and the server can exclude specific addresses from the assignable pool. Exclusions are important because some addresses in the subnet may be reserved for routers, servers, printers, infrastructure interfaces, or static assignments. DHCP leasing means the client receives an address for a defined lease time and must renew it before expiration. Cisco CCNA 200-301 v1.1 IP Services includes DHCP because engineers must understand address pools, default-router options, DNS options, exclusions, and relay behavior. The server, not the client, maintains the pool of assignable addresses. DHCP does not assign addresses forever without renewal. A client can receive DNS server information, but the statement that it can request up to four DNS servers is not the core tested role here. The two correct operational roles are that the DHCP server can exclude addresses from a pool and lease client IP addresses dynamically. Those are A and D.

Unused switch ports should not remain active in the default VLAN. The proper hardening approach is to administratively shut them down and move them into an unused access VLAN, often called a parking, black-hole, or unused VLAN. Shutting the port stops an attacker from plugging in and immediately gaining Layer 2 connectivity. Moving the port out of VLAN 1 reduces the impact if someone later enables the port accidentally. EtherChannel is irrelevant because it aggregates links; it does not protect idle user-facing ports. Trunking unused ports is actively dangerous because it could expose multiple VLANs. CDP can disclose device information and is not a protection method for unused ports. Cisco CCNA v1.1 Network Access and Security Fundamentals overlap here: secure access-layer design includes disabling unused interfaces, avoiding the default VLAN for user access, and limiting unintended Layer 2 exposure. Therefore, B and C are the correct operational steps.

Answer D is the technically correct selection. A DNS lookup resolves a name query or reverse query by asking DNS infrastructure for the matching value. In normal client use, DNS translates a hostname into an IP address so the application can connect to the destination. This aligns with Cisco CCNA 200-301 v1.1 because the exam blueprint requires engineers to recognize operational behaviour from configuration symptoms and topology requirements. DNS does not ping the destination, act as an HA redirector by default, or merely define port 53 service behaviour. Treat the distractors carefully: most are real Cisco terms, but they solve a different problem or operate at a different layer. The selected answer is the one that would be used by an engineer on the device or in the design to produce the outcome stated in the question.