Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeA switchport connected to another switch should carry multiple VLANs, but it was manually configured as an access port. What is the most likely operational result?
Explanation: An access port is designed to carry only a single VLAN. If the link is intended to carry multiple VLANs, it must be configured as a trunk. The switch will not automatically convert the port to a trunk (B). The port remains a Layer 2 access port, not a routed Layer 3 interface (C). VLANs are not automatically summarized into a single prefix (D). The most likely result is that the link will not carry multiple VLANs as intended.
You are connected to R1. Configure IPv4 and IPv6 addressing on R1's interfaces and verify reachability to R2. The current configuration has a wrong subnet mask on G0/0, missing default gateway for IPv4, and R1's IPv6 address is configured using EUI-64 while R2 uses a static IPv6 address. Fix these issues so that R1 can ping both R2's IPv4 and IPv6 addresses.
Explanation: The problem had three issues: (1) R1's G0/0 subnet mask was /24 (255.255.255.0) but R2's G0/0 was /30 (255.255.255.252), causing an IP subnet mismatch. (2) R1 lacked a default gateway for IPv4; the static route pointed to 192.0.2.254 which is not reachable. (3) R1's IPv6 EUI-64 configuration on G0/0 generates an interface ID from the MAC, but R2 expects a static address 2001:db8:1::2/64, so R1 must use a static IPv6 address on the same subnet. The fix: change R1's G0/0 mask to /30, add a default route via R2's G0/0 IP (192.0.2.2), and configure a static IPv6 address (e.g., 2001:db8:1::1/64) on R1's G0/0.
A switchport is configured for 802.1X authentication. What is the usual role of the RADIUS server in that design?
Explanation: The switch acts as the authenticator and forwards authentication requests to the RADIUS server, which validates the user or device credentials.
A switch shows a clock that is several minutes off from other devices even though an NTP server has been configured. Which issue is the most likely cause?
Explanation: NTP requires IP reachability to the time source. If the NTP server is unreachable due to routing or ACL issues, the switch falls back to its local clock, causing drift. Option A is correct. Option B is wrong because Syslog has no effect on NTP synchronization. Option C is incorrect because NTP does not require a trunk port; it can operate over any VLAN with IP connectivity. Option D is false because DNS is only needed if the NTP server is specified by hostname; the server can be reached by IP address without DNS.
A network engineer is troubleshooting OSPFv3 adjacency between two directly connected Cisco routers, R1 and R2, both running IOS-XE. The engineer configures OSPFv3 on both routers but notices that the adjacency does not form. The engineer runs 'show ospfv3 neighbor' on R1 and sees no neighbors. What is the most likely cause of this issue?
Explanation: Option B is correct because OSPFv3 requires explicit interface-level configuration to enable the protocol on a specific interface. The correct command is 'ospfv3 1 ipv6 area 0' (or 'ipv6 ospf 1 area 0' for the traditional OSPFv3 configuration). Without this command, the interface does not participate in OSPFv3, so no Hello packets are sent or received, preventing adjacency formation.
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Practice all Which Command Should the Administrator Use Practice QuestionsPractise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command. These appear throughout the 200-301 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 200-301. Practicing each scenario type ensures you're ready for any format.
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