Cisco Updated 200-301 Exam Questions and Answers by abbas

The lldp reinit command controls the delay before LLDP reinitializes on an interface. LLDP is a vendor-neutral neighbor discovery protocol, and Cisco IOS exposes several global LLDP timers. lldp timer sets how often LLDP advertisements are sent. lldp holdtime tells the receiving device how long to retain LLDP information before aging it out. lldp tlv-select controls which TLVs are included in advertisements. The question specifically asks for the delay time in seconds for LLDP to initialize, which matches lldp reinit. The option labeled lldp holdtimt is also a typo and refers to the wrong function even if corrected to holdtime. CCNA v1.1 Network Access includes Layer 2 discovery protocols such as CDP and LLDP. The exam often tests command intent rather than full configuration output. Here, the word initialize is the giveaway. Timer means advertisement interval; holdtime means neighbor retention; reinit means initialization delay.

Forward-time is the Rapid PVST+/STP timer that controls the listening and learning periods before a port is allowed to forward user traffic. The command spanning-tree vlan 1 forward-time 20 sets that timer for VLAN 1 to 20 seconds. The other commands tune different STP values: max-age controls how long bridge protocol information is retained, hello-time controls BPDU transmission frequency, and priority affects root-bridge election. For CCNA 200-301 v1.1 Network Access, the key distinction is that a port must listen, then learn MAC addresses, then forward. Cisco Catalyst documentation describes forward time as the value that determines how long the listening and learning states last before forwarding begins. Because the question specifically says the switch “listens and learns for a specific time period,” the only command that directly matches that behavior is the VLAN forward-time command. Reference: Cisco Catalyst Spanning Tree configuration guidance; CCNA 200-301 v1.1 Network Access objectives.

TCP and UDP both include checksums, but TCP adds reliability mechanisms that UDP does not provide. TCP uses acknowledgments so the sender knows what data arrived, retransmissions when data is lost, sequencing to put data back in order, and windowing to control the amount of outstanding data. UDP is deliberately simpler. It uses a checksum for error detection, but it does not establish a reliable session, acknowledge every segment, or retransmit lost data at the transport layer. Applications that use UDP can build their own recovery if they need it, but UDP itself does not guarantee delivery. Cisco CCNA 200-301 v1.1 Network Fundamentals expects this distinction to be automatic: TCP is connection-oriented and reliable; UDP is connectionless and best-effort. The other answer choices introduce parity checks or CRC as transport reliability methods, which is not the TCP/UDP comparison being tested. The correct statement is that TCP uses checksum, acknowledgments, and retransmissions, while UDP uses checksums only.

Spine-and-leaf networks scale access capacity by adding another leaf switch and connecting that leaf to every spine switch. That preserves the fabric’s predictable any-leaf-to-any-leaf pathing and keeps oversubscription under control. A leaf switch is where servers, endpoints, or access-facing devices attach; spine switches provide the high-speed interconnection layer between leaves. Leaves do not connect to other leaves, and spines do not connect to other spines in the classic two-tier Clos design. Adding only a spine switch does not create additional access ports. Adding a leaf with a single uplink to one spine would create a bottleneck and break the equal-cost multipath design principle. CCNA 200-301 v1.1 Network Access and Network Fundamentals include spine-leaf as a modern data-center architecture pattern. The verified answer is D: add a leaf switch with connections to every spine switch. Reference: Cisco spine-leaf/Clos architecture design guidance.