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Cisco Certified Network Associate (CCNA) 200-301 Practice Test 18

Question 170

A switching team is evaluating a deployment. A plain PC access port sends untagged Ethernet, while the uplink trunk adds 802.1Q tags to nonnative VLAN traffic. What approach correctly addresses the stated requirement?

  1. Leave the PC link in access VLAN 20 for untagged frames, and use a trunk that tags VLAN 20 if VLAN 20 is not the trunk native VLAN.
  2. Tag every PC Ethernet frame with a trunk VLAN header before the host receives it, despite its ordinary untagged access NIC.
  3. Strip all VLAN IDs from the trunk and infer the original VLAN purely from source MAC addresses.
  4. Use the PC default gateway address as the 802.1Q VLAN tag field.

Explanation

Correct Answer

A:

Cisco access ports associate ordinary untagged Ethernet with one access VLAN. An 802.1Q trunk includes a tag for nonnative VLANs to preserve separate broadcast domains over one link.

Incorrect Answers

B:

An ordinary access port presents untagged frames to the PC; internal trunk tagging is a separate switch-uplink function.

C:

Without encapsulation the receiving switch cannot generally recover several simultaneous VLAN identities from one interswitch link.

D:

A VLAN ID is a Layer 2 dot1q identifier, not an IPv4 next-hop address.

Question 171

A switching team must explain an outage. A capture shows VLAN 20 traffic arriving untagged on a trunk peer whose native VLAN differs from the sending switch. Which diagnosis follows from these observations?

  1. The receiving switch reads an 802.1Q VLAN 20 tag from the untagged frame and always classifies it correctly.
  2. The failure is necessarily a duplicate IPv4 host address, even though the evidence identifies L2 native tagging.
  3. The outgoing switch has enabled VLAN pruning but both trunk native IDs agree.
  4. A native VLAN mismatch is misclassifying untagged frames: the receiving trunk treats them as its own native VLAN rather than the sender’s intended VLAN 20.

Explanation

Correct Answer

D:

Native VLAN assignment is local to each trunk end; untagged frames carry no ID to disambiguate them. Misaligned IDs can leak or misplace untagged traffic even if tagged VLANs appear normal.

Incorrect Answers

A:

An untagged frame has no 802.1Q VLAN ID for the receiver to parse.

B:

An address duplicate is a different fault and is not demonstrated by the observed untagged classification.

C:

The evidence explicitly states mismatched native IDs; VLAN pruning alone would not explain wrong mapping of untagged traffic.

Question 172

Hosts in VLAN 150 on Switch A can reach their local gateway but not peers in VLAN 150 behind Switch B. VLAN 100 works across the same uplink. `show interfaces trunk` on Switch A lists allowed VLANs 100,150, but Switch B lists only VLAN 100 as allowed. Which fault best matches this selective outage?

  1. Both switches have stopped learning all source MAC addresses because VLAN 100 is permitted.
  2. The hosts in VLAN 150 require a new OSPF router ID before they can exchange Layer 2 frames.
  3. VLAN 150 is excluded from Switch B's trunk allowed list and cannot traverse the uplink bidirectionally.
  4. The trunk should be replaced with access VLAN 100 because one VLAN still passes traffic.

Explanation

Correct Answer

C:

Trunk VLAN membership must permit the desired VLAN traffic on both ends of an interswitch connection. Switch A admits VLAN 150, but Switch B's allowed list excludes it, so frames belonging to that VLAN cannot traverse the link as intended. The fact that VLAN 100 still works isolates the issue to a per-VLAN transport policy rather than a total physical-link outage. Add VLAN 150 on Switch B using the appropriate allowed-list operation, verify the VLAN exists and is active there, and test end-to-end VLAN 150 traffic. A correct trunk status output should show the permitted VLAN on both peers.

Incorrect Answers

A:

Source MAC learning is associated with the VLAN and ingress port of received frames. A trunk that successfully carries VLAN 100 does not inherently disable MAC learning for every VLAN. The observed selective failure maps directly to the missing allowed VLAN 150 on Switch B rather than a switchwide forwarding-table outage.

B:

OSPF router IDs are used to identify routers in an OSPF routing domain. Hosts on the same VLAN need Layer 2 forwarding across the trunk and do not exchange OSPF adjacencies to reach peers in their local subnet. Fix the missing VLAN carriage before investigating inter-subnet routing.

D:

Converting the uplink to a single access VLAN would eliminate the multi-VLAN trunk capability that the design explicitly needs. VLAN 100 working is evidence the physical path and at least one VLAN can operate; it does not justify dropping VLAN 150. Align the trunk allowed lists instead.

Question 173

Troubleshooting report: The switches report different native VLAN IDs, and untagged control frames are assigned to different VLANs at the two ends. Which finding best accounts for the behavior?

  1. The warning proves the 802.1Q encapsulation standard was changed to 802.3ad LACP.
  2. The two ends of the 802.1Q trunk have mismatched native VLAN assignments, so they interpret untagged frames differently.
  3. The peers necessarily have identical native VLANs because both physically carry tagged data.
  4. The mismatch means all PC access ports on both switches are administratively disabled.

Explanation

Correct Answer

B:

A native VLAN mismatch warning reflects inconsistent local trunk configuration. Align the IDs and confirm operational trunk output to remove the mapping hazard.

Incorrect Answers

A:

LACP negotiates aggregation membership, not native VLAN matching.

C:

Tagged VLAN traffic can function despite a native VLAN mismatch and warning.

D:

A trunk-native discrepancy does not automatically shutdown unrelated endpoint access ports.

Question 174

An interface with working physical carrier remains operationally access mode and cannot convey tagged frames for the second VLAN. The team should investigate which specific technical cause?

  1. The intended uplink is still an operational access port, not a trunk; change the mode and verify `show interfaces trunk` before testing VLAN 20.
  2. The trunk is operational because its local VLAN database includes both VLANs.
  3. The downstream host has an invalid /24 mask, which explains a link dropping tagged VLAN 20 frames before routing.
  4. The native VLAN is misconfigured, yet the port is definitely forwarding nonnative VLAN 20 tags.

Explanation

Correct Answer

A:

VLAN database entries do not convert an access link into a tagging trunk. `show interfaces ... switchport` identifies the administrative and operational modes; tagged second-VLAN frames need an actual trunk.

Incorrect Answers

B:

Configured VLANs are not proof of trunking mode or allowed VLAN tag forwarding.

C:

The observed interface operating as access mode explains dropped/ignored second-VLAN tags regardless of host IP mask.

D:

The evidence establishes it is not operating as a trunk at all.

Question 175

Two neighboring Cisco switches use `switchport mode dynamic auto` on both ends of a new interswitch connection. Both interfaces are physically up, but `show interfaces trunk` shows no operational trunk. Which configuration behavior causes this result?

  1. Dynamic auto sends active LACP packets only when a third Ethernet cable is attached.
  2. Two dynamic-auto DTP ports do not initiate trunk negotiation with each other; at least one suitable peer must actively request or be explicitly configured for trunking.
  3. The trunk is established but hidden until OSPF reaches a FULL neighbor state.
  4. VLAN tagging cannot operate over GigabitEthernet and therefore requires a serial interface.

Explanation

Correct Answer

B:

DTP dynamic auto is a passive negotiation choice on supported Cisco switch platforms. With both ends in dynamic auto, neither actively initiates the trunking decision, so an operational trunk does not form merely because Ethernet carrier is present. Set the intended infrastructure link to explicit `switchport mode trunk` on both ends, or use a compatible negotiated mode where that behavior is deliberately required; consider `switchport nonegotiate` only where appropriate. Confirm operational mode with `show interfaces switchport` and `show interfaces trunk`, then check allowed VLANs and native VLAN consistency. This scenario tests DTP mode behavior, not LACP aggregation.

Incorrect Answers

A:

LACP controls EtherChannel aggregation and uses active/passive negotiation for multiple member links. DTP dynamic-auto ports negotiate VLAN trunking mode, which is a separate protocol. The absence of an operational trunk between two auto ports is not explained by the number of LACP member cables or LACP packet initiation.

C:

OSPF is a Layer 3 routing protocol and does not govern whether an Ethernet switchport operates as an 802.1Q trunk. An interswitch trunk can function without any OSPF process. The relevant check is the DTP administrative and operational switchport modes, not OSPF neighbor state.

D:

802.1Q VLAN tags are used specifically on supported Ethernet trunk links, including GigabitEthernet. A serial connection is not required. The interfaces have compatible physical media; the issue is that neither dynamic-auto end requests trunk establishment, so configure the switchport modes correctly.

Question 176

A switching team collects this evidence: The switch allows VLAN 40, but router Gi0/0.40 is configured encapsulation dot1q 50 and VLAN 40 cannot reach its gateway. Which root-cause interpretation best fits the observations?

  1. The subinterface already receives VLAN 40 tagged traffic because its numeric name ends in .40.
  2. The switch must enable IP routing to deliver VLAN 40 packets to the connected router subinterface.
  3. `Gi0/0.40` is configured to match VLAN 50, so VLAN 40 tagged frames never reach that router subinterface; change encapsulation to dot1q 40.
  4. The router needs a DHCP relay on VLAN 50 to correct the VLAN 40 802.1Q tag mismatch.

Explanation

Correct Answer

C:

Router-on-a-stick requires the encapsulation VLAN number to match incoming tags. The correct gateway IP on a subinterface does not repair a VLAN-ID mismatch.

Incorrect Answers

A:

Interface suffix is only a local naming convention; the `encapsulation dot1Q 50` command controls actual tag matching.

B:

The switch can transport VLAN 40 frames over a trunk at Layer 2; the tag mismatch is on the router.

D:

DHCP relay cannot alter the tag accepted by the router subinterface.

Question 177

Troubleshooting report: The PC NIC cannot process frames that arrive with a VLAN tag because the connected switchport was inadvertently configured as a trunk. Which finding best accounts for the behavior?

  1. The PC must have negotiated LACP to remove the VLAN tag from incoming frames.
  2. A correct access VLAN assignment necessarily causes all PC Ethernet frames to arrive tagged.
  3. The PC-facing port is incorrectly in trunk mode and passes tagged frames to a host that expects untagged access frames.
  4. A DNS resolver mismatch directly adds unexpected 802.1Q tags to NIC ingress.

Explanation

Correct Answer

C:

Standard endpoint access links normally have one untagged data VLAN. Return the port to access mode with the correct access VLAN unless the NIC is deliberately configured for VLAN tagging.

Incorrect Answers

A:

LACP handles bundled Ethernet links, not normal host VLAN-tag parsing.

B:

Normal access-mode egress strips 802.1Q tags rather than presenting them to an untagged NIC.

D:

DNS name resolution cannot change Layer 2 trunk tagging on the attached switchport.

Question 178

SW1 Gi1/0/24 connects to SW2 as an 802.1Q trunk. `show interfaces trunk` reports Gi1/0/24 trunking with allowed VLANs 20,30,99 and native VLAN 99. A packet capture shows VLAN 20 and 30 frames tagged, while VLAN 99 frames are untagged. Which conclusion is supported?

  1. The port must be an access port because VLAN 99 frames are untagged.
  2. The existence of tagged VLAN 20 traffic proves inter-VLAN IP routing is enabled.
  3. The trunk is operating and the shown tagging is consistent with native VLAN 99 and tagged nonnative VLANs.
  4. The trunk is broken because IEEE 802.1Q requires every native VLAN 99 frame to carry an explicit tag.

Explanation

Correct Answer

C:

The operational interface output shows the port in trunk mode, permits VLANs 20, 30 and 99, and names VLAN 99 as native. Under the usual Cisco 802.1Q trunk behavior, nonnative VLAN 20 and 30 frames carry 802.1Q tags, while native VLAN 99 frames can be transmitted untagged. The capture is consistent with that configuration. Validate both ends use the same native VLAN and that required VLANs are active and allowed, especially if one VLAN still fails. Do not confuse the existence of a working trunk with proof that end hosts have the right gateway or that an ACL permits their IP packets.

Incorrect Answers

A:

An 802.1Q trunk can carry one native VLAN untagged by default while using VLAN tags for other VLANs. Seeing some untagged frames is therefore not evidence of an access port. The operational trunk state and the presence of VLAN 20 and 30 tagged frames demonstrate that the port is carrying multiple VLANs. Interpret frame tags together with the configured native VLAN and trunk output.

B:

VLAN tagging is a Layer 2 mechanism that identifies the VLAN membership of frames. It does not automatically provide routed interfaces or gateway addresses for communication between different IP subnets. The captured frames prove the tagging behavior of a trunk, not an inter-VLAN routing configuration. Routing would require additional SVI or router-subinterface evidence and working Layer 3 routes.

D:

On Cisco platforms with default native-VLAN behavior, the native VLAN commonly uses untagged frames; optional tag-native settings can alter this. The question states a trunk with native VLAN 99 and observed tagged nonnative traffic, so an assertion that untagged native traffic must always mean failure is incorrect. Diagnosing a fault requires an actual configuration or traffic mismatch, not a blanket tag-every-frame rule.

Question 179

A network acceptance test follows this reported failure: VLAN 30 exists on both switches but is absent from the operational trunk's allowed-and-forwarding list at one end. Which verification most specifically demonstrates the repaired function rather than checking an unrelated feature?

  1. `show vlan brief` lists VLAN 30 on SW1, with no verification of trunk allowed status on SW2.
  2. `show interfaces trunk` on both peers includes VLAN 30 in the allowed, active and STP-forwarding lists, and a VLAN 30 L2 test succeeds.
  3. `show ip route` displays a default route while VLAN 30 remains missing from the trunk active list.
  4. The trunk reports VLAN 10 forwarding and VLAN 30 absent, but is considered repaired because carrier is up.

Explanation

Correct Answer

B:

The defect was a filtered VLAN despite a configured database entry. The operational allowed-and-forwarding state, not mere `show vlan` existence, proves the trunk now carries the affected broadcast domain.

Incorrect Answers

A:

A local VLAN can exist while the far trunk still prunes it.

C:

A Layer 3 route is not evidence of Layer 2 trunk forwarding for the selected VLAN.

D:

A working other VLAN and physical link do not demonstrate the missing VLAN 30 has been restored.

Question 180

A switching team is validating a repair. Earlier, the switches report different native VLAN IDs, and untagged control frames are assigned to different VLANs at the two ends. Which postchange check most directly establishes the specific problem is resolved?

  1. Both peers list VLAN 20 in the VLAN database while continuing to use different native IDs.
  2. Only a different switch user-access VLAN is checked; trunk native settings are not inspected.
  3. All physical interface counters are zero after shutting down the link for the test.
  4. Both interfaces report the same trunk native VLAN ID, and controlled untagged test frames are learned in that intended VLAN on the receiving side.

Explanation

Correct Answer

D:

The earlier fault classified untagged control and data frames inconsistently. Aligning `show interfaces ... switchport` native IDs plus verifying receive-side VLAN mapping directly tests that behavior.

Incorrect Answers

A:

VLAN existence does not correct where untagged trunk frames are classified.

B:

Unrelated endpoint VLAN memberships cannot validate the trunk’s native untagged mapping.

C:

A disabled trunk cannot demonstrate correct forwarding of untagged frames.

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