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Cisco 200-301 Bundle

Exam Code: 200-301

Exam Name Cisco Certified Network Associate (CCNA)

Certification Provider: Cisco

Corresponding Certification: CCNA

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Cisco 200-301 Practice Test 16

Question 150

A newly created VLAN 24 is included in a Cisco trunk’s configured allowed list, but `show interfaces trunk` reports VLAN 24 absent from the VLANs-active-in-management-domain section. Another switch has VLAN 24 active. What should the local engineer check first?

  1. Create or restore VLAN 24 in the local switch VLAN database, then verify forwarding on the trunk.
  2. Remove every other VLAN from the trunk allowed list.
  3. Change the trunk native VLAN to 24 with no other checks.
  4. Disable CDP because the neighbor is advertising the wrong VLAN.

Explanation

Correct Answer

A:

An allowed VLAN entry determines which VLAN identifiers MAY cross the trunk, but the VLAN also must be present and active on the local switch. Because the operational output specifically lacks VLAN 24 in the active set, check its local definition before replacing a working allowed list. STP forwarding state is a further independent verification once the VLAN is active.

Incorrect Answers

B:

A tighter allowed list does not create the missing local VLAN, and removing established VLANs can interrupt working services. The missing active-VLAN status points to the database.

C:

Native VLAN changes untagged-frame classification but does not automatically create the absent VLAN. It may also cause a native mismatch with the peer.

D:

CDP is a discovery protocol and cannot make a VLAN active in the switch database. Suppressing neighbor messages would hide useful diagnostics.

Question 151

A trunk carries VLAN 10 as native and VLAN 20 as a tagged user VLAN. An operator enables native VLAN tagging on a platform that supports it. What changes for frames in VLAN 10?

  1. Frames in VLAN 20 become untagged because VLAN 10 gained a tag.
  2. The link turns into a Layer 3 routed port without any switchport changes.
  3. Native VLAN 10 traffic is tagged on the trunk under the supported native-tagging configuration.
  4. STP is disabled because native VLAN frames can no longer carry BPDUs.

Explanation

Correct Answer

C:

By default many Cisco 802.1Q trunks send native VLAN frames untagged, but platform-supported native VLAN tagging changes that behavior. Both ends should agree on handling and use a consistent native VLAN. The setting does not eliminate the logical separation between VLAN 10 and VLAN 20.

Incorrect Answers

A:

Tagged and native VLAN settings are not mutually exclusive in that way. VLAN 20 remains a separately identified VLAN and is normally carried with its own tag.

B:

Frame tagging affects Layer 2 trunk encapsulation; it does not automatically enable IP routing or remove switchport mode. A routed interface requires separate supported configuration.

D:

STP control-frame behavior depends on protocol/platform handling and does not disappear merely because native tagging is enabled. The switch still needs loop protection.

Question 152

An enterprise is moving VLAN 200 across two switches. An engineer tries to solve it by setting each access port to a different native VLAN, while the interswitch link is not a trunk. What design correction is necessary?

  1. Set an IP route with VLAN 200 as the next-hop address.
  2. Enable SSH on the switches and assume the VLAN is extended.
  3. Configure the interswitch link as a consistent 802.1Q trunk permitting VLAN 200.
  4. Put both switches’ management interfaces in VLAN 200 and keep the uplink as access VLAN 1.

Explanation

Correct Answer

C:

Native VLAN semantics apply to trunks, not a pair of unrelated host-facing access ports. The VLAN must be present and carried across the intended interswitch path; a tagged trunk transports it while retaining the local access assignments. Verify that both switches recognize VLAN 200 and that spanning tree permits the link to forward.

Incorrect Answers

A:

A VLAN ID is not an IPv4 next-hop address, and a route cannot fix an absent Layer 2 VLAN transit path. Trunk carriage must be established.

B:

SSH creates encrypted management sessions to the network devices. It has no role in configuring the trunk VLAN list and cannot bridge the two VLAN instances.

D:

Management placement does not automatically transport user frames in VLAN 200. The uplink would still deliver only its configured access VLAN rather than the required extended broadcast domain.

Question 153

The network team needs to verify whether port Gi1/0/24 is operationally trunking and see its native and allowed VLAN settings. What IOS command is the most direct initial inspection?

  1. `show running-config | section router ospf` exclusively.
  2. `show access-lists` as the only verification.
  3. `show interfaces trunk` on the switch.
  4. `show ip route` as the only verification.

Explanation

Correct Answer

C:

This show command lists currently trunking switch interfaces and their mode, encapsulation, native VLAN and permitted VLANs. It is the direct operational check for an 802.1Q transport problem. `show vlan brief` is still useful for access-port membership, but typically does not display trunk forwarding state as completely.

Incorrect Answers

A:

OSPF configuration can describe routed interfaces, but it does not show the operational trunk port state or permitted VLAN set. The trouble is local Layer 2 switching.

B:

ACL counters concern packet filtering rather than 802.1Q trunk encapsulation state. The reported need is an interface/VLAN transport check.

D:

The IP routing table lists destination prefixes and next hops. It cannot prove whether a specific Layer 2 switch port is trunking or which VLANs are allowed there.

Question 154

A trunk between two switches is permitted to carry VLANs 10, 20 and 30, but the security team must stop VLAN 30 from traversing this single uplink while allowing 10 and 20 to continue. Which narrowly scoped interface command fits on a supported IOS switch?

  1. `switchport trunk allowed vlan add 30`.
  2. `no vlan 30` on every switch in the campus.
  3. `switchport trunk native vlan 30`.
  4. `switchport trunk allowed vlan remove 30` on the approved trunk interface.

Explanation

Correct Answer

D:

Cisco IOS supports an allowed-VLAN list with additive and removal forms. The `remove 30` form removes just VLAN 30 from the currently permitted set, leaving 10 and 20 unchanged if they were already allowed. Verify the operational allowed list on both ends and other forwarding paths so the policy is enforced without unnecessary VLAN deletion.

Incorrect Answers

A:

The additive form would ensure VLAN 30 remains permitted, opposite the security requirement. The command must remove the unauthorized identifier.

B:

Global VLAN deletion could disrupt unrelated legitimate VLAN 30 services elsewhere. The requirement applies to one trunk path, so changing that interface is less disruptive.

C:

Changing the native VLAN affects untagged traffic classification and may introduce a mismatch. It does not implement removal of VLAN 30 from the permitted trunk list.

Question 155

A trunk is configured to carry VLANs 10, 20 and 30, but a sensitive management VLAN 99 is also present in the VLAN database. The security requirement is to prevent VLAN 99 traffic from traversing this uplink. Which configuration controls that path?

  1. Delete VLAN 99 globally even though other switches still use it locally.
  2. Change VLAN 99’s IP default gateway and assume the trunk stops forwarding its Ethernet frames.
  3. Increase the STP bridge priority of VLAN 99 on this switch.
  4. Restrict the trunk’s allowed VLAN list to the approved VLANs and verify VLAN 99 is absent from operational trunk carriage.

Explanation

Correct Answer

D:

An 802.1Q trunk can carry multiple VLANs, but that does not mean every VLAN in the local switch database must be permitted. An explicit allowed list constrains which VLAN frames use the link. Verify both sides and any downstream trunks so management VLAN 99 remains excluded from this path as intended.

Incorrect Answers

A:

Removing the VLAN everywhere can disrupt legitimate management segments and is broader than the stated uplink-scoped restriction. The design needs only a specific trunk allowance change.

B:

Layer 3 gateway selection does not define which tagged VLAN IDs are permitted on an Ethernet trunk. Trunk allowed VLAN settings must enforce the link policy.

C:

STP root preference controls loop-free topology rather than absolute VLAN admission. A VLAN may still traverse a trunk even if the local switch is not its root.

Question 156

An interswitch trunk lists VLANs 10, 20, 30, and 40 as configured, but a security policy now requires that only VLANs 10 and 20 traverse that particular link. What configuration should be changed?

  1. Restrict the trunk allowed VLAN list to VLANs 10 and 20, consistently across the path.
  2. Disable the native VLAN so all IP subnets are dropped.
  3. Assign an extended IP ACL to each host interface in VLAN 30.
  4. Delete VLANs 30 and 40 from every switch on the campus.

Explanation

Correct Answer

A:

An 802.1Q trunk can transport many VLANs, but the allowed VLAN list controls which active segments can traverse the uplink. Restricting it to the required authorized VLANs prevents unnecessary broadcast-domain extension. Verify both link ends and downstream dependencies so the change does not accidentally isolate legitimate clients.

Incorrect Answers

B:

Native VLAN settings govern untagged trunk frames and do not selectively remove VLANs 30 and 40. Such a change would not implement the requested allowed-list policy.

C:

IP ACLs may filter Layer 3 traffic but do not directly control whether an entire VLAN is transported as tagged frames on the interswitch link. Trunk allowed-list filtering matches the L2 requirement.

D:

Removing VLANs globally could disrupt unrelated services elsewhere. The requirement is narrower: block those VLANs from one transit link while retaining their other authorized locations.

Question 157

A switch port has `switchport mode trunk` and `switchport nonegotiate` to avoid DTP. The far-end port is `switchport mode dynamic auto`, and required tagged VLANs do not pass. What compatibility correction fits the design?

  1. Configure the peer explicitly as an 802.1Q trunk with a compatible allowed and native VLAN policy.
  2. Keep the far end dynamic auto because it always initiates DTP.
  3. Disable IP routing globally on both switches.
  4. Assign every attached desktop to the native VLAN.

Explanation

Correct Answer

A:

`switchport nonegotiate` suppresses DTP frames from the local trunk. A dynamic-auto peer does not initiate trunking on its own, so it cannot rely on the missing DTP negotiation to become a trunk. Explicit trunking on both ends with consistent VLAN handling restores the intended multi-VLAN path without enabling automatic negotiation.

Incorrect Answers

B:

Dynamic auto is passive: it normally waits for another side to request a trunk. With the local peer suppressing DTP, no successful negotiation is initiated.

C:

IP forwarding does not control DTP negotiation or whether an Ethernet link carries 802.1Q tags. The reported problem is link trunk mode.

D:

Moving unrelated endpoints does not make the interswitch port trunk correctly, and it could collapse data segmentation. Fix the link mode at the two peers.

Question 158

Two switches carry an approved voice VLAN over an 802.1Q trunk. The trunk operational output shows VLAN 30 allowed but VLAN 30 removed by spanning tree blocking on that link, while VLAN 10 forwards normally. What should the operator conclude?

  1. VLAN 30 has been deleted from every switch’s VLAN database.
  2. VLAN 30 is permitted on the trunk but its STP instance is not forwarding on that link; inspect the per-VLAN topology.
  3. The link has changed into an IP-only routed interface because one VLAN is blocked.
  4. The switch must disable STP entirely to carry both VLANs simultaneously.

Explanation

Correct Answer

B:

Trunk allowance controls whether a VLAN can be transported, while Rapid PVST+ can independently place a port into a blocking/discarding role for that VLAN. Operational output distinguishes permitted, active and STP-forwarding VLAN sets. A switch may therefore forward one VLAN on a trunk while preventing a Layer 2 loop for another.

Incorrect Answers

A:

The scenario states VLAN 30 is allowed and active on the local trunk. Its absence from the forwarding list is explained by STP state, not global deletion.

C:

A routed interface would not simultaneously trunk VLAN 10 normally. The problem is a per-VLAN Layer 2 forwarding state on an operating trunk.

D:

Disabling loop prevention is unsafe and may recreate redundant Layer 2 loops. Repair an unintended root/path design if needed rather than removing STP protection.

Question 159

A trunk is configured with native VLAN 70 on the upstream switch but native VLAN 80 on the downstream switch. An untagged frame is received on the downstream port. In the default native VLAN behavior, how is it classified there?

  1. It automatically keeps upstream VLAN 70 because the frame includes its VLAN tag.
  2. It is delivered to every VLAN because untagged traffic bypasses segmentation.
  3. It is classified into the receiving port’s configured native VLAN 80, creating a mismatch with the sender’s intended VLAN.
  4. The switch performs IPv4 longest-prefix matching before choosing the VLAN.

Explanation

Correct Answer

C:

An untagged Ethernet data frame arriving on an 802.1Q trunk belongs to the receiver’s native VLAN under normal native handling. If the ends disagree, traffic can be misclassified across VLANs and cause reachability or security problems. Align the approved native VLAN and verify the link’s operational tagging.

Incorrect Answers

A:

The premise says the received frame is untagged, so there is no 802.1Q VLAN 70 identifier in that frame. The downstream port applies its own native classification.

B:

An ordinary trunk still classifies untagged frames into a particular native VLAN, not all VLANs. Misconfiguration causes wrong placement, not unrestricted broadcast across segments.

D:

VLAN classification happens at Ethernet ingress before any optional Layer 3 forwarding. IP route lookup cannot select the native VLAN for an untagged link frame.

Question 160

An access switch advertises too much information about its device identity on an untrusted publicly exposed Ethernet jack. The security team wants to stop sending Cisco Discovery Protocol advertisements on that port while keeping CDP elsewhere. Which change is scoped correctly?

  1. Use `no cdp enable` on the exposed interface.
  2. Disable SSH remote management on every switch.
  3. Use `no cdp run` globally.
  4. Disable the native VLAN on every trunk.

Explanation

Correct Answer

A:

Cisco discovery advertisement can reveal device and port information to directly connected neighbors. Interface-scoped `no cdp enable` stops CDP on that one interface without globally disabling discovery on trusted infrastructure links. Verify operational behavior because security posture depends on other enabled discovery mechanisms too.

Incorrect Answers

B:

SSH governs remote command access, not local CDP frame transmission. Removing SSH would make management harder without suppressing discovery advertisements.

C:

This disables CDP throughout the device, not only on the exposed interface. It may satisfy suppression but unnecessarily removes useful discovery on trusted links.

D:

Native VLAN handling affects Ethernet tagging, not whether the access port sends CDP neighbor frames. It is an unrelated broad disruption.