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Cisco Certified Network Associate (CCNA) 200-301 Practice Test 16

Question 150

A switchport connects a Cisco IP phone with a PC behind its PC port. The design requires PC data VLAN 20 and phone voice VLAN 120. `show interfaces Gi1/0/7 switchport` instead reports access VLAN 20 and voice VLAN 20. Phones and PCs receive addresses from the same subnet. What is the most direct diagnosis?

  1. The configured voice VLAN matches the data access VLAN, so voice and PC traffic are not placed in the intended distinct VLANs.
  2. The trunk native VLAN on an unrelated switch uplink must be 120, so all user devices share a subnet.
  3. The IP phone cannot pass untagged PC traffic unless the access port is administratively shut down.
  4. The switch must disable CDP to let the phone learn its voice VLAN.

Explanation

Correct Answer

A:

The switchport explicitly places both roles into VLAN 20. A supported Cisco phone typically tags voice traffic for the configured voice VLAN while forwarding attached PC data via the access VLAN. The intended design calls for voice VLAN 120 and data VLAN 20; using 20 for both defeats the segmentation. Correct the `switchport voice vlan` configuration to 120, ensure the VLAN and routing/DHCP paths exist, then verify the phone and PC obtain addresses from their intended networks. This fault is visible in the access-port switchport output itself; changing unrelated trunks first is not justified. Verify both devices' leases after the change rather than assuming matching VLAN IDs are harmless.

Incorrect Answers

B:

A trunk's native VLAN controls untagged treatment across an 802.1Q trunk, not the per-host voice VLAN value shown on Gi1/0/7. A native-VLAN mismatch elsewhere can disrupt certain traffic, but it does not explain why this access interface explicitly reports voice VLAN 20 instead of the required 120. First repair the direct configuration discrepancy.

C:

Cisco phones commonly bridge an attached PC through the phone's integrated switch, with PC traffic untagged on the access data VLAN and voice traffic tagged according to the voice VLAN policy. An administrative shutdown would prevent the needed link rather than allow separation. The observation is an incorrect VLAN assignment, not proof that PC traffic requires the switchport to be disabled.

D:

CDP can advertise voice VLAN information to compatible phones. Disabling it can remove useful discovery data and does not correct the access-port `switchport voice vlan` setting. Some environments use LLDP-MED, but the essential problem is that the configured voice VLAN equals the data VLAN, not the specific neighbor discovery protocol. Verify the intended advertised policy and the data/voice VLANs after correcting configuration.

Question 151

A switching team must explain an outage. Gi1/0/18 remains an access port with Access Mode VLAN: 1, but staff assumed a trunk-native VLAN change would move this host. Which diagnosis follows from these observations?

  1. The port must already be in user VLAN 30 because the switch uplink native VLAN was changed to 30.
  2. VLAN 1 is a routed-only interface with no ability to contain access hosts.
  3. Gi1/0/18 is still an access port in VLAN 1; explicitly set its access VLAN to the intended user VLAN.
  4. The host cannot communicate because `ip routing` was disabled, even though no L3 path is being tested.

Explanation

Correct Answer

C:

The switchport operational output identifies the actual access membership. Native VLAN changes on other trunks do not alter this endpoint port. Confirm `show interfaces gi1/0/18 switchport` after moving it.

Incorrect Answers

A:

Native VLAN applies to trunk untagged traffic; the displayed endpoint access VLAN remains 1.

B:

VLAN 1 is a valid Layer 2 VLAN and the factory/default access membership on many Cisco switches.

D:

The immediate evidence is incorrect access VLAN membership; routing status is not needed to establish that mismatch.

Question 152

A switching team collects this evidence: VLAN 20 hosts have a working switch trunk but the router lacks Gi0/0.20 with encapsulation dot1q 20 and an IP gateway. Which root-cause interpretation best fits the observations?

  1. The switch uplink trunk is physically down, despite verified working trunk forwarding.
  2. The router lacks VLAN 20’s `Gi0/0.20` subinterface, matching `encapsulation dot1q 20`, and its configured gateway IP.
  3. The router automatically creates a gateway IP for every 802.1Q VLAN observed on its trunk.
  4. The VLAN 20 host should use a VLAN 30 router subinterface without changing IP subnet.

Explanation

Correct Answer

B:

Router-on-a-stick routing requires a logical L3 interface for each routed VLAN, with the matching 802.1Q VLAN ID and subnet gateway. A good switch trunk alone cannot route VLAN 20 traffic when the router has no such subinterface.

Incorrect Answers

A:

The scenario confirms the switch trunk works; the absent router L3 subinterface is the differentiating defect.

C:

IOS does not dynamically invent the per-VLAN routed subinterfaces and IP addresses required here.

D:

A wrong-VLAN gateway cannot replace the missing route on the correct subnet.

Question 153

A multilayer switch has `interface Vlan220`, IP 10.220.0.1/24 and `no shutdown`, but `show ip interface brief` reports Vlan220 down/down. `show vlan brief` shows VLAN 220 exists, yet every associated access port is disconnected and no active trunk carries VLAN 220. Which condition best explains the SVI line state?

  1. The switch lacks a default route to the Internet, which administratively shuts all SVIs.
  2. The VLAN has no operational Layer 2 member or eligible active trunk carrying it, so SVI autostate cannot come up.
  3. A DNS resolver has no A record for the SVI's interface address, so Layer 2 fails.
  4. The OSPF router ID has not been manually set, preventing the VLAN database from forming.

Explanation

Correct Answer

B:

On common Catalyst behavior, an SVI's protocol line state depends on the VLAN being active and having an eligible operational Layer 2 forwarding member. A configured address and `no shutdown` are not enough when no connected access port or active permitted trunk provides an operational VLAN member. Verify VLAN existence, operational switchport VLAN membership, trunk allowed/active state and spanning-tree forwarding; bring up a valid member and confirm the SVI becomes up/up. The routed interface is then able to advertise the connected prefix if IP routing is enabled. Exact autostate details can vary by platform, so use switch state output to prove the condition.

Incorrect Answers

A:

A missing default route affects how the switch forwards destinations outside connected networks. It does not normally force an otherwise valid SVI into down/down state. SVI operational state is tied to local VLAN and Layer 2 link state, rather than the presence of an Internet route. Restore eligible Layer 2 membership first.

C:

DNS maps names to addresses but does not control whether a physical or virtual switched interface reports operational line protocol up. The configured 10.220.0.1 address is sufficient for interface addressing; a DNS A record is irrelevant to VLAN 220's missing active members. Diagnose the switchport and VLAN state instead.

D:

An OSPF router ID can affect how an OSPF process identifies itself in a routing domain, but the Layer 2 VLAN database exists independently of that process. The SVI has a local autostate problem before OSPF adjacency or route exchange would be considered. Check VLAN members and operational trunk links.

Question 154

VLAN 30 is active and locally learned on SW1, but absent from the allowed and active VLAN list on SW2's interswitch trunk. The team should investigate which specific technical cause?

  1. The VLAN is properly extended because SW1 alone lists VLAN 30 as active.
  2. Only a missing static IP route on SW1 can make VLAN 30 absent from `show interfaces trunk`.
  3. A native VLAN mismatch necessarily prevents every tagged VLAN 30 frame from traversing the trunk.
  4. SW2’s trunk is not forwarding VLAN 30 because VLAN 30 is missing from its allowed-and-active operational list.

Explanation

Correct Answer

D:

Local `show vlan` evidence on SW1 is insufficient to establish the VLAN across a link. Verify VLAN 30 exists and is allowed, active and STP-forwarding on the SW2 trunk before troubleshooting client gateways.

Incorrect Answers

A:

VLAN existence on one switch does not overcome pruning or missing VLAN membership at the receiving trunk.

B:

Trunk allowed/active state is Layer 2 configuration and operation, not a routed-prefix entry.

C:

Nonnative tagged VLAN traffic may continue even when native VLANs differ; the given missing allowed/active state is direct evidence.

Question 155

A switching team must explain an outage. One printer port still references deleted VLAN 220 and no longer forwards while ports already reassigned to VLAN 230 remain usable. Which diagnosis follows from these observations?

  1. The printer was already moved to VLAN 230 and is affected solely by the deletion of unused VLAN 220.
  2. The printer remains assigned to deleted VLAN 220, so its switchport lacks an active VLAN for normal forwarding until reassigned.
  3. The switch silently migrates access ports from any deleted VLAN to the next numeric VLAN.
  4. The printer fault proves the VLAN 230 SVI has the wrong default route.

Explanation

Correct Answer

B:

Removing a still-used VLAN from the database can leave access ports referencing an inactive VLAN and disrupt service. Moving hosts to the replacement VLAN and confirming connectivity before deletion avoids this outage.

Incorrect Answers

A:

The evidence states the printer port still references 220, unlike the already migrated working ports.

C:

An IOS switch does not automatically reassign all ports to VLAN 230 after removal of 220.

D:

VLAN 230 hosts work; the distinguishing failure concerns the printer port still mapped to deleted VLAN 220.

Question 156

A switching team collects this evidence: The PC behind a phone unexpectedly gets an address from the voice subnet, suggesting voice/data VLAN classification is wrong. Which root-cause interpretation best fits the observations?

  1. The PC is correctly isolated in its intended data VLAN because any working DHCP lease proves VLAN correctness.
  2. The phone voice VLAN can never affect attached workstations under any switchport misconfiguration.
  3. The router default route must be wrong because the workstation leased from a voice subnet.
  4. The PC’s untagged frames are being classified into the voice VLAN rather than the intended data access VLAN; inspect phone pass-through and port data/voice VLAN configuration.

Explanation

Correct Answer

D:

The DHCP subnet a workstation receives provides useful evidence of its effective broadcast domain. Confirm the DHCP scopes and switchport classification before blaming voice signaling or inter-VLAN routes.

Incorrect Answers

A:

DHCP may succeed from the wrong VLAN and deliver an address from its unintended scope.

B:

Incorrect tagging, phone port behavior or swapped access/voice settings can misclassify the downstream workstation.

C:

A host receiving a voice-scope address points first to L2 VLAN placement or DHCP relay/scope mapping, not necessarily a default route.

Question 157

An engineer configures switch Fa0/7 with switchport mode access and switchport access vlan 30. The port is physically connected, and VLAN 30 exists. Which operational check most directly confirms Fa0/7 is assigned as an access member of VLAN 30?

  1. Verify that interface Vlan30 has an IPv4 address and an up line protocol
  2. Use show vlan brief to see Fa0/7 listed under VLAN 30
  3. Check show interfaces trunk for VLAN 30 on an uplink
  4. Use show spanning-tree vlan 30 to identify the root bridge

Explanation

Correct Answer

B:

The show vlan brief display lists VLANs that exist on the switch and identifies access ports associated with each VLAN. Because Fa0/7 was configured for switchport mode access and switchport access vlan 30, the validation should find Fa0/7 beneath VLAN 30 and should not find it unexpectedly under another access VLAN. This is a Layer 2 membership test, separate from whether the workstation has an IP address, whether a trunk allows the VLAN, or whether an SVI is up. If the interface is absent from the expected VLAN, inspect its administrative and operational switchport mode with show interfaces switchport, and confirm the configured VLAN exists and is active.

Incorrect Answers

A:

An SVI being up and addressed establishes information about a Layer 3 interface, not membership of a particular physical access port. An access switch might have no SVI for VLAN 30 and still switch frames correctly in that VLAN. Conversely, the SVI can be up because a different port participates. The question asks whether Fa0/7 specifically is an access member of VLAN 30, so the VLAN membership display is the direct evidence.

C:

The show interfaces trunk output reports operational trunk links and their permitted or forwarding VLANs. It does not enumerate the physical access interfaces assigned to VLAN 30. Even if the uplink allows VLAN 30, Fa0/7 could still be configured in VLAN 1 or an incorrect VLAN. Trunk verification is useful for a different cross-switch propagation question, but the named local access-port membership is answered directly by show vlan brief.

D:

Spanning tree shows root selection and port states for a VLAN, which helps isolate loops and blocked forwarding paths. That does not directly report the configured access VLAN membership of Fa0/7. A switch can have a stable VLAN 30 spanning-tree topology while Fa0/7 belongs to a different VLAN. The acceptance condition specifically names an access-port VLAN assignment, so use the local VLAN membership view first.

Question 158

A switching team has repaired a network problem. The phone and desktop both obtain addresses in the data subnet, and switchport voice VLAN shows none despite CDP phone discovery. Which device or protocol check is the strongest evidence that this particular failure is gone?

  1. `show cdp neighbors` displays the phone but the voice VLAN still shows none.
  2. `show ip route` contains a campus default route while both devices still receive data-scope addresses.
  3. `show interfaces Gi1/0/12 switchport` reports the intended access VLAN 20 and voice VLAN 110, and a phone/PC test gets separate voice/data subnet leases.
  4. `show vlan brief` lists VLAN 110 somewhere on the switch, while the affected port still has no voice VLAN.

Explanation

Correct Answer

C:

The original defect was a missing voice-VLAN setting despite phone discovery. Operational switchport voice/data assignment plus distinct endpoint addresses verifies the repair rather than merely proving that a phone is connected.

Incorrect Answers

A:

Discovery of a Cisco phone is independent of the configured data/voice VLAN classification that was broken.

B:

A route does not validate the voice VLAN tagging policy or prevent the endpoints from sharing the wrong subnet.

D:

VLAN existence alone does not prove assignment to this phone-facing port.

Question 159

On a Cisco switch, Gi1/0/10 is an unconfigured user-facing access port, while Gi1/0/48 is an 802.1Q trunk whose native VLAN is 99. The administrator must verify that the access port remains in VLAN 1 while the trunk treats VLAN 99 as its native untagged VLAN. Which check directly distinguishes those two settings?

  1. Inspect show interfaces switchport for BOTH ports, comparing Access Mode VLAN on Gi1/0/10 with Trunking Native Mode VLAN on Gi1/0/48
  2. Display only the trunk allowed-VLAN list without the access-port configuration or trunk native-VLAN field
  3. Count the dynamic MAC entries in VLAN 1 without inspecting either interface mode
  4. Run show vlan brief on the access port only and infer the trunk native VLAN from that access membership

Explanation

Correct Answer

A:

A switchport interface display directly exposes the administrative and operational port mode, its Access Mode VLAN, and, for a trunk, its Trunking Native Mode VLAN. Inspect Gi1/0/10 to confirm it is in access mode with access VLAN 1, then inspect Gi1/0/48 to confirm it is an operational trunk with native VLAN 99. The untagged access VLAN of one interface and the native VLAN of a trunk serve different purposes and need not have the same ID. Comparing those specific fields proves the intended distinction without guessing from VLAN database membership or MAC-learning activity.

Incorrect Answers

B:

An allowed-VLAN list determines which VLAN IDs the trunk is permitted to carry, but it does not establish the access-port VLAN of Gi1/0/10. Depending on the command and platform output, allowed VLANs also are not equivalent to the trunk native-VLAN setting. The question requires a comparison between two different interface roles, so looking only at one trunk admission list omits critical evidence.

C:

Dynamic MAC entries reveal where a switch learned source MAC addresses for a VLAN. They do not establish whether Gi1/0/48 uses native VLAN 99 or whether Gi1/0/10 is administratively an access port. The MAC table can be empty because no traffic has recently crossed a correctly configured interface. Interface-mode and VLAN fields, rather than traffic-learned addresses alone, are necessary to answer this configuration question.

D:

The show vlan brief command is useful for viewing local VLAN existence and access-port membership. It does not by itself report the native-VLAN setting of an 802.1Q trunk elsewhere on the switch. A port in VLAN 1 by default does not force every trunk to use VLAN 1 as its native VLAN. The two concepts must be inspected separately, which this one-port command does not accomplish.

Question 160

A switching team is validating a repair. Earlier, VLAN 20 hosts have a working switch trunk but the router lacks Gi0/0.20 with encapsulation dot1q 20 and an IP gateway. Which postchange check most directly establishes the specific problem is resolved?

  1. Confirm only the physical router Gi0/0 has carrier, while Gi0/0.20 remains absent.
  2. Check that VLAN 30 can ping its own gateway and assume VLAN 20 must now route too.
  3. `show running-config interface Gi0/0.20` confirms `encapsulation dot1Q 20` and a valid VLAN 20 gateway IP; a VLAN 20 host can reach that address.
  4. Change only the trunk native VLAN and do not inspect VLAN 20 router tagging.

Explanation

Correct Answer

C:

The prior root cause was a missing router subinterface. Inspect the exact subinterface tag and IP, plus an endpoint gateway reachability test, to establish both configuration and function.

Incorrect Answers

A:

An up physical parent cannot supply the missing per-VLAN Layer 3 interface.

B:

One VLAN’s success does not prove another absent router-on-a-stick subinterface exists.

D:

The necessary 802.1Q ID and gateway IP for VLAN 20 remain unverified.

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