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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 15

Question 140

A router-on-a-stick design receives dot1q-tagged frames for VLAN 65 over router physical interface Gi0/3. Which subinterface setting creates the correct VLAN encapsulation for its gateway?

  1. `interface Gi0/3.65`; `ip route 0.0.0.0 0.0.0.0`.
  2. `interface Gi0/3.65`; `encapsulation dot1Q 66`.
  3. `interface Gi0/3.65`; `encapsulation dot1Q 65`; then assign the gateway IPv4 address.
  4. `interface Gi0/3`; `switchport access vlan 65`.

Explanation

Correct Answer

C:

Router-on-a-stick uses logical subinterfaces associated with 802.1Q VLAN IDs on the shared router trunk. The `encapsulation dot1Q 65` line ensures that frames for VLAN 65 are delivered to the correct routed gateway interface. The connected switchport must also carry the VLAN on a trunk; an access port alone would not transport multiple tagged VLANs.

Incorrect Answers

A:

A static default route is not a VLAN tagging instruction and this form is incomplete. It does not establish subinterface encapsulation for the incoming VLAN.

B:

The encapsulation VLAN ID 66 does not match the requested VLAN 65, so its tagged traffic would not reach this intended gateway.

D:

Routed router interfaces do not ordinarily use switchport access membership syntax in this design. A tagged router-on-a-stick gateway requires dot1q encapsulation on a subinterface.

Question 141

A Cisco multilayer switch has active VLAN 50 access ports and matching client addressing, but `show ip interface brief` reports `Vlan50 administratively down`. What corrective configuration addresses that specific state?

  1. Add an unrelated static default route instead of enabling Vlan50.
  2. Issue `no shutdown` under interface Vlan50, then confirm its line protocol and member VLAN state.
  3. Change the physical access ports to VLAN 1 so Vlan50 becomes active.
  4. Disable the entire switch Spanning Tree process.

Explanation

Correct Answer

B:

An administratively down SVI has been disabled through interface configuration regardless of whether its VLAN has working Layer 2 member ports. Re-enabling the SVI is the direct response to the reported administrative state. Once operational, also confirm the address and routed reachability rather than assuming a port-state change alone proves application connectivity.

Incorrect Answers

A:

A default route determines forwarding for unmatched destinations but cannot override an administrator-disabled interface. The SVI must come up before its connected prefix participates.

C:

The access ports are already active in the intended VLAN. Moving them elsewhere removes its member ports and cannot clear an SVI shutdown command.

D:

STP does not remove the administrative shutdown state from a Layer 3 SVI. Turning off loop protection is risky and unrelated to the observed status.

Question 142

A switch access port is configured for a data VLAN and a separate voice VLAN for an IP phone with a PC behind it. The PC works, but the phone still sends its traffic untagged and joins the data VLAN. What should be checked first?

  1. Convert the PC-facing data port into a router-only serial interface.
  2. Confirm the phone supports and receives the voice VLAN advertisement (for example via CDP/LLDP-MED) and that voice VLAN configuration is consistent.
  3. Disable all voice VLAN commands so both devices permanently share the data VLAN.
  4. Change only the site’s NTP server to make the phone tag traffic.

Explanation

Correct Answer

B:

Cisco IP phones can learn a voice VLAN from switch advertisements and tag their voice frames accordingly, while the attached PC uses ordinary untagged data frames. A phone that does not learn the intended voice VLAN may remain in the data VLAN even when the access-port commands appear correct. Check neighbor capability and actual voice-tagging behavior.

Incorrect Answers

A:

A serial point-to-point interface does not solve 802.1Q voice tagging on a switched Ethernet port. It would remove the existing working PC connection.

C:

That abandons the required voice/data segmentation rather than correcting the phone’s tagging. The specific issue is learning or applying the intended voice VLAN.

D:

Correct time can support telephony services, but NTP does not advertise the Ethernet VLAN assignment for the phone. The voice VLAN negotiation must be checked.

Question 143

Two gateway SVIs, Vlan40 and Vlan41, are up and `ip routing` is enabled. Hosts can ping both SVI addresses, but a new inbound VLAN 40 ACL denies all traffic to the VLAN 41 subnet. Which mechanism explains the loss of inter-VLAN application connectivity?

  1. VLAN 40 must be renamed VLAN 41 so both networks share the same Layer 2 domain.
  2. The default-gateway address cannot work when IP routing is enabled on the switch.
  3. An IP ACL can deny routed traffic even when both SVIs are operational and routing is enabled.
  4. A larger MAC table must automatically override every routed IP ACL.

Explanation

Correct Answer

C:

The Layer 3 interfaces already supply a routed path between the VLAN subnets, so a missing SVI is not the cause. An inbound ACL attached to the source SVI can evaluate and deny packets before they traverse to Vlan41. Review ordered ACE matches and the implicit deny, then make a narrowly authorized permit without removing general segmentation protections.

Incorrect Answers

A:

Renaming or merging VLANs is not necessary for routed communication and would defeat segmentation. The ACL is an explicit packet filter in the supplied evidence.

B:

Enabled IP routing is what allows connected VLAN interfaces to forward between networks. The SVI ping success confirms that the gateways themselves are reachable.

D:

MAC learning decides Layer 2 egress within a VLAN; it does not bypass Layer 3 ACL enforcement. Adding hardware table space cannot correct an ordered deny.

Question 144

Trunk port Gi1/0/13 currently permits only VLAN 40, but a newly deployed application uses VLAN 44. The VLAN exists on both switches and the trunk should continue carrying its existing VLANs. What is the targeted correction?

  1. Add VLAN 44 to the trunk allowed-VLAN list without removing the current VLANs.
  2. Replace the allowed-VLAN list with only VLAN 44.
  3. Disable spanning tree globally on the distribution switches.
  4. Change every host access port to native VLAN 44.

Explanation

Correct Answer

A:

An 802.1Q trunk only forwards VLAN traffic that is allowed by its configured membership rules. The new VLAN 44 is absent from the list, so its tagged frames are filtered at the interswitch link. Use the supported additive allowed-VLAN command and verify both endpoints, preserving already authorized VLANs.

Incorrect Answers

B:

Replacing instead of adding would remove the original allowed VLAN 40 and break existing traffic. The requirement explicitly preserves currently served VLANs.

C:

STP protects against redundant bridging loops and does not cause a missing allowed-VLAN entry to appear. Disabling it creates additional risk without fixing the filter.

D:

Host access assignments and trunk native VLAN behavior are different controls. The trunk is blocking a new tagged VLAN because its allowed list omits 44.

Question 145

Two 802.1Q-capable switches connect via port Gi1/0/4; they must transport user VLANs 60 and 70 simultaneously. Which port operational mode is necessary on the interswitch link?

  1. Configure access mode only in VLAN 60.
  2. Configure a routed Layer 3 port with only `ip address 10.1.3.1 255.255.255.0`.
  3. Configure a supported 802.1Q trunk mode and allow VLANs 60,70.
  4. Create an OSPF neighbor relationship over the physical cable.

Explanation

Correct Answer

C:

An 802.1Q trunk carries traffic for multiple VLAN IDs between switches, adding tags to frames for nonnative VLANs. In this link, both VLANs 60 and 70 must be permitted and exist on the switches. A normal access port carries one configured data VLAN and cannot independently transport both tagged domains.

Incorrect Answers

A:

Access mode classifies ordinary untagged traffic into one data VLAN, 60, and would not carry the separate 70 domain as a tagged trunk.

B:

A routed interface transports IP traffic but is not an 802.1Q Layer 2 trunk bridging both user VLANs. The requirement is VLAN preservation between switches.

D:

OSPF routes IP networks and does not add VLAN tags for separate broadcast domains. The missing function is 802.1Q trunking.

Question 146

A new switch uplink is configured `switchport mode access` on one end and `switchport mode trunk` on the other. Some VLANs stop working across it. What is the direct compatibility issue?

  1. The device DNS servers are using different recursion policies.
  2. An IPsec tunnel uses the wrong encryption transform.
  3. The switches have different administrative hostnames.
  4. The two ports disagree on whether the link carries multiple tagged VLANs.

Explanation

Correct Answer

D:

A trunk expects to transport multiple VLAN IDs, while an access port normally handles one untagged data VLAN. Misaligned modes can drop or misclassify frames when VLANs cross the link. Set consistent trunk operation on both ends and verify native and allowed VLAN details before diagnosing upper-layer routes.

Incorrect Answers

A:

DNS policy does not change whether interswitch interfaces accept 802.1Q tagged frames. The symptom aligns directly with trunk-versus-access mode mismatch.

B:

The connection described is a local Ethernet switching uplink, not an IPsec VPN. Encryption negotiation cannot reconcile access and trunk port behavior.

C:

Hostnames can differ on every switch without affecting 802.1Q compatibility. The failure is determined by the interface switching modes and frame tagging.

Question 147

An interswitch trunk has native VLAN 299 on Switch A and native VLAN 300 on Switch B. CDP reports a native-VLAN mismatch. Both ends must treat untagged traffic consistently. What should the engineer do?

  1. Configure the same approved native VLAN on both ends of the trunk and verify tagging behavior.
  2. Disable CDP solely to suppress the mismatch message.
  3. Set each end to a different access VLAN and keep the trunk active.
  4. Change only the IP subnet masks of the two switches.

Explanation

Correct Answer

A:

The native VLAN is the 802.1Q VLAN associated with untagged traffic on an ordinary trunk, subject to platform tagging configuration. Mismatched native values 299 and 300 can bridge untagged frames into an unintended VLAN and raise a management warning. Align the values under an approved design, rather than hiding the diagnostic.

Incorrect Answers

B:

Turning off discovery hides a symptom but does not reconcile which VLAN receives untagged frames. The actual forwarding mismatch remains.

C:

Access mode would remove the multi-VLAN trunk function and still not satisfy consistent tagging. The goal is aligned native VLAN handling on both trunk peers.

D:

IP masks affect management or routing, not how the Layer 2 trunk classifies untagged Ethernet frames. The native VLAN IDs must agree.

Question 148

A Cisco 802.1Q trunk is configured with native VLAN 20 and allowed tagged user VLAN 50. Under normal default Cisco native VLAN operation, what happens to Ethernet data frames associated with native VLAN 20?

  1. They are carried untagged on the trunk unless explicit native VLAN tagging is configured.
  2. They are encrypted using WPA2 before crossing the trunk.
  3. They are converted into OSPF LSAs before transmission.
  4. They are always tagged with VLAN ID 50.

Explanation

Correct Answer

A:

802.1Q ordinarily identifies the native VLAN for untagged frames on a trunk. Frames belonging to tagged VLAN 50 carry their VLAN ID, while native VLAN 20 traffic can be transmitted without the tag under the default convention. Some platforms permit explicitly tagging native frames, so verify actual operational configuration.

Incorrect Answers

B:

WPA2 protects wireless frames, not ordinary 802.1Q Ethernet trunk encapsulation. Native VLAN handling does not negotiate Wi-Fi keys.

C:

OSPF LSAs belong to routing control traffic and are not a representation of ordinary Ethernet user frames. A trunk transports Layer 2 frames with the configured tagging behavior.

D:

VLAN 50 is a separate user VLAN, not the configured native VLAN 20. Treating native frames as if they belonged to 50 would mix segmentation.

Question 149

Two switches have an 802.1Q link. Port A is `switchport mode dynamic auto` and Port B is also `dynamic auto`; the link remains an access connection and does not carry several required VLANs. Why did negotiation fail to create a trunk?

  1. The two switches require OSPF adjacency before they can negotiate 802.1Q tagging.
  2. Neither `dynamic auto` side actively requests trunking; use an approved explicit trunk configuration or compatible DTP negotiation mode.
  3. The native VLAN must equal the device hostname for DTP to form a trunk.
  4. Dynamic auto always initiates a trunk on both ends and the failure proves the Ethernet cable is broken.

Explanation

Correct Answer

B:

DTP dynamic auto accepts a compatible trunk proposal but does not initiate it against another passive auto port. With both sides passive, the link may remain non-trunking and tagged VLANs cannot traverse it. Configure a trunk with the required allowed VLAN list and verify the operational mode on both ends.

Incorrect Answers

A:

802.1Q and DTP are Layer 2 mechanisms; OSPF is a Layer 3 routing protocol. A missing OSPF neighbor does not prevent trunk-mode negotiation.

C:

Native VLAN selection governs how untagged frames are classified. It is not compared with a management hostname during trunk negotiation.

D:

The ports can be electrically up while operating as access links. The negotiation mode mismatch, not physical link failure, explains the lack of tagged VLAN transport.

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.