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Question 180
A multilayer switch has VLAN 115 access ports but no routed default gateway for 10.115.0.0/24. Which interface type must be created and assigned the gateway address?
- Configure only switchport voice vlan 115 on the IP-phone access ports
- Add VLAN 115 to an uplink trunk while leaving it without an IP gateway
- Create a static route to 10.115.0.0/24 through an unrelated WAN gateway
- Create an SVI for VLAN 115 with the correct subnet address
Explanation
Correct Answer
D:The VLAN 115 SVI terminates and routes traffic from the voice subnet.
Incorrect Answers
A:Voice VLAN tagging separates frames but does not create an SVI with the IP gateway for subnet 10.115.0.0/24.
B:Transporting the VLAN does not establish Layer 3 default-gateway reachability.
C:Routing through a remote next hop is not a replacement for the connected VLAN 115 SVI gateway on this switch.
Question 181
A server uses an untagged Ethernet NIC and must never negotiate a trunk on Gi1/0/10. Which fixed switchport mode is appropriate on the server-facing interface?
- Leave switchport mode dynamic desirable to let the server negotiate DTP
- Configure switchport mode trunk with one allowed VLAN
- Enable switchport nonegotiate while leaving switchport mode trunk
- Set the switchport explicitly to access mode
Explanation
Correct Answer
D:Static access mode avoids accidentally negotiating a trunk to an endpoint.
Incorrect Answers
A:A basic untagged server NIC does not participate in DTP trunk negotiation; dynamic trunking conflicts with the fixed access-mode requirement.
B:It may transport tagged/untagged frames, but remains a trunk and violates the explicit no-trunk constraint.
C:Disabling DTP advertisements does not change an already configured trunk into a fixed access port.
Question 182
A port-channel between switches must convey traffic from VLANs 10, 20 and 30 while preserving separate 802.1Q tags. Which logical link mode and VLAN allowance satisfy this requirement?
- Set switchport mode access and place every service in VLAN 10
- Keep the Port-channel in Layer 3 routed mode with no switchport
- Configure only DTP dynamic auto at both Port-channel ends
- Set an 802.1Q trunk carrying an explicit permitted VLAN list
Explanation
Correct Answer
D:A trunk multiplexes several VLAN domains through one link.
Incorrect Answers
A:One untagged access VLAN cannot preserve separate tags for three VLAN identities over the aggregate.
B:A routed IP port-channel does not carry the specified Layer 2 trunk VLAN tags.
C:Two dynamic-auto peers ordinarily do not negotiate a trunk, and no explicit allowed VLAN list is established.
Question 183
A trunk carries VLANs 10 through 100, but an isolation change must limit that one trunk to only VLANs 10 and 20 without deleting VLANs on the switches. Which property should be restricted?
- Configure a routed SVI between VLAN 10 and VLAN 20, leaving trunk allowance unchanged
- Change the link from 802.1Q trunk mode to access mode in VLAN 10
- Restrict its allowed VLAN list
- Append VLANs 10 and 20 with switchport trunk allowed vlan add while leaving the existing 10–100 allowance intact
Explanation
Correct Answer
C:Replace the trunk allowed-VLAN set with exactly 10,20. An allowed VLAN list filters forwarding on this trunk without removing VLANs from the switch VLAN database.
Incorrect Answers
A:Creating an inter-VLAN routed interface changes Layer 3 reachability but does not remove unwanted VLANs from an existing trunk transport allowed list.
B:Access mode would carry one untagged access VLAN, whereas the requirement preserves a trunk for both VLANs 10 and 20.
D:The add keyword appends entries and retains previously allowed VLANs, so it cannot remove VLANs 30 through 100 from the trunk list.
Question 184
A new user port was accidentally placed in VLAN 25 instead of the intended VLAN 15. Before changing anything, which read-only command lists VLANs and their access-interface membership?
- Run show mac address-table dynamic to find the PC MAC without checking its configured access VLAN
- Run show interfaces trunk to inspect uplink permitted VLANs
- Run show ip interface brief to read the switch SVI addresses
- Review show vlan brief
Explanation
Correct Answer
D:Access-port VLAN membership appears in the switch VLAN table.
Incorrect Answers
A:MAC learning may help locate a host but the requested command is the authoritative access VLAN membership listing.
B:That shows trunk VLAN carriage rather than the VLAN assigned to a single untagged user port.
C:SVI IP addresses do not identify which physical access interface was assigned VLAN 25.
Question 185
A PC in VLAN 115 can reach its local hosts, but needs Layer 3 reachability to VLAN 120 on another IP subnet. Which gateway or routed-interface function is necessary?
- Allow VLAN 120 on a trunk but disable every VLAN 115/120 routed gateway
- Enable spanning-tree PortFast on all switch-to-switch trunks
- Move only the source PC to an unused VLAN 1 without its gateway
- Configure a reachable inter-VLAN routed interface
Explanation
Correct Answer
D:Routing through a gateway is necessary once the destination leaves the host subnet.
Incorrect Answers
A:Trunk allowance provides local VLAN carriage only; hosts in distinct IP networks still require gateways with route lookup.
B:PortFast affects Layer 2 transition and cannot route between two different subnets.
C:Changing access VLAN without correct Layer 3 configuration does not supply the intersubnet forwarding requirement.
Question 186
On Gi1/0/48, the peer may be configured to disable DTP negotiation. The local Cisco Catalyst interface must operate as an 802.1Q trunk regardless of whether the peer advertises trunk negotiation. Which mode command sets that local behavior?
- switchport mode dynamic auto
- Configure switchport mode trunk
- switchport mode access
- switchport nonegotiate by itself
Explanation
Correct Answer
B:The explicit trunk mode makes the local port a permanent trunk rather than depending on successful DTP negotiation; the neighboring port still must be compatible.
Incorrect Answers
A:Dynamic auto is passive and depends on compatible DTP negotiation with the peer; it does not force a trunk independent of the neighbor.
C:Access mode is a fixed nontrunk mode for one access VLAN and does not carry the intended tagged 802.1Q VLANs.
D:Suppressing DTP messages does not itself choose the interface mode; the local port must also be set to trunk.
Question 187
Both ends of an existing 802.1Q trunk are already in trunk mode. The network design requires untagged frames on that link to belong to VLAN 99 instead of the default VLAN 1. Which interface command sets this behavior?
- switchport access vlan 99
- Configure switchport trunk native vlan 99
- switchport trunk allowed vlan 99
- switchport voice vlan 99
Explanation
Correct Answer
B:The native-vlan command defines the VLAN associated with untagged traffic on an 802.1Q trunk; both link partners should use the same native VLAN to avoid mismatches.
Incorrect Answers
A:An access VLAN controls an access-mode port and does not change the native VLAN of an already operational trunk.
C:Restricting the allowed set to VLAN 99 is not equivalent to changing which VLAN is used for untagged frames on a trunk.
D:This option sets an auxiliary voice VLAN on a phone-facing access port, rather than the trunk’s untagged/native VLAN.
Question 188
A fixed Cisco Catalyst trunk currently allows all VLAN IDs. Security policy permits only user VLAN 10 and server VLAN 20 over this particular interswitch link; all other data VLANs must be excluded. Which interface command expresses the exact allowed list?
- switchport trunk allowed vlan 10
- Configure switchport trunk allowed vlan 10,20
- switchport trunk allowed vlan 10,20,30
- switchport trunk native vlan 20
Explanation
Correct Answer
B:An explicit allowed VLAN list of 10 and 20 restricts data VLAN admission on that trunk; a native-VLAN change is independent and cannot substitute for the filter.
Incorrect Answers
A:This excludes VLAN 20, which the stated policy also requires across the same trunk.
C:Including VLAN 30 violates the explicit requirement to pass only VLANs 10 and 20 on this uplink.
D:The native VLAN setting governs treatment of untagged frames; it does not restrict which tagged data VLANs can traverse the trunk.
Question 189
During a VLAN-20 forwarding incident, an operator needs a read-only IOS command showing which interfaces are operational trunks and which VLANs are permitted and forwarding on each trunk. Which command best supplies this summary?
- show vlan brief
- Run show interfaces trunk
- show interfaces status
- switchport trunk allowed vlan 20
Explanation
Correct Answer
B:The show interfaces trunk operational output identifies trunk ports, native VLANs and allowed/active/forwarding VLAN lists, enabling an engineer to locate a blocked or omitted VLAN without a configuration change.
Incorrect Answers
A:The VLAN database lists IDs and access port membership, but it does not present the complete operational trunk and spanning-tree-forwarding VLAN state.
C:This provides port status and speed information, not the targeted allowed/active/forwarding VLAN breakdown for all trunks.
D:This is a configuration change rather than the read-only operational status report requested for troubleshooting.
Question 190
A Cisco Catalyst uplink is already manually placed into trunk mode and connects to a peer whose trunk mode is also explicitly configured. The team must suppress local DTP frames while keeping the link an ordinary 802.1Q trunk. Which additional interface command is appropriate where supported?
- switchport mode dynamic auto
- switchport trunk native vlan 99
- switchport trunk allowed vlan 10,20
- Use switchport nonegotiate where the platform supports it
Explanation
Correct Answer
D:On supported Catalyst interfaces, switchport nonegotiate disables DTP frame generation while trunk operation remains explicitly configured at both ends.
Incorrect Answers
A:Dynamic auto relies on DTP negotiation rather than suppressing negotiation traffic; it conflicts with the stipulated fixed-mode design.
B:This assigns the untagged VLAN but does not disable Dynamic Trunking Protocol advertisements on the port.
C:The allowed list filters VLAN admission; it does not stop DTP frames from being generated.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests
