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Scenario-based practice

VLAN and Inter-VLAN Routing Scenarios

Practise 350-401 VLAN and trunking questions covering access ports, trunk ports, allowed VLAN lists, native VLAN, inter-VLAN routing, and command-output troubleshooting.

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15
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350-401
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Cisco
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Scenario guide

How to approach vlan and inter-vlan routing scenarios

VLAN misconfiguration is one of the top sources of connectivity failures in real networks and one of the most tested areas on the CCNA. These questions cover VLAN access ports, 802.1Q trunks, native VLANs, and router-on-a-stick or layer-3 switch inter-VLAN routing.

Quick answer

Routing questions usually test route selection (administrative distance, metric), how static routes are configured and when they are preferred over dynamic routing.

Administrative distance comparing routing sources.

Static route configuration: next-hop vs exit interface.

Default route propagation and the gateway of last resort.

Recursive routing table lookups.

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Practice set

Practice scenarios

Question 1mediumdrag order
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Drag and drop the steps to configure VLAN Trunking Protocol (VTP) on a Cisco switch in the correct order.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
Question 2easymultiple choice
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A network administrator is troubleshooting a performance issue in a large enterprise campus network. The network consists of Cisco Catalyst 9300 switches acting as access switches and Cisco Catalyst 9500 switches as distribution. Users on VLAN 10 report intermittent slow file transfers to a server on VLAN 20. The administrator has verified that there are no errors on the links, CPU utilization is normal, and STP topology is stable. The administrator suspects a possible QoS issue. Upon checking the QoS configuration on the access switch, the administrator finds that the default QoS configuration is in place, which trusts the CoS value at the port level. The connected devices are IP phones and PCs; the IP phones mark voice traffic with CoS 5. The server on VLAN 20 is connected to a distribution switch. Which action should the administrator take to most likely resolve the issue?

Question 3hardmultiple choice
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Your company has deployed a Cisco Catalyst 9300 switch stack as the distribution layer for a campus network. The network uses VLANs 10 (data), 20 (voice), and 30 (management). The switch stack is configured with DHCP snooping, Dynamic ARP Inspection (DAI), and IP Source Guard (IPSG) on access ports. Recently, users in VLAN 10 report intermittent connectivity issues. You notice that some users receive duplicate IP addresses from the DHCP server. The DHCP server is connected to a trunk port on the switch stack. After reviewing logs, you see that DHCPACK messages are being dropped on the trunk port. The DHCP snooping binding table shows entries for legitimate clients, but also some entries with MAC addresses from a different vendor. Which action should you take to resolve the issue?

Question 4mediummulti select
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Which TWO of the following are valid methods to mitigate VLAN hopping attacks?

Question 5mediummultiple choice
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Examine the following configuration snippet:

interface GigabitEthernet1/0/1
 switchport mode access
 switchport access vlan 100
 spanning-tree portfast
 spanning-tree bpduguard enable

What is the effect of this configuration?

Question 6easymultiple choice
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An engineer needs to configure a switchport to carry traffic for multiple VLANs to a router using a single physical link. Which configuration should be applied on the switchport?

Question 7mediummulti select
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Which TWO actions are valid for configuring 802.1Q trunking on a Cisco switch? (Choose two.)

Question 8mediummulti select
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A company has a requirement to provide redundancy for the default gateway on a subnet. Two switches are configured with HSRP. Which two interfaces on the switches must be in the same VLAN to form the HSRP group?

Question 9easymultiple choice
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An engineer is configuring a new VLAN 100 on a switch. Which command must be used to create the VLAN?

Question 10mediummultiple choice
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A network engineer is troubleshooting intermittent connectivity issues between two switches connected via a trunk link. The engineer notices that the port counters show a high number of CRC errors and runts on one side. Which action should the engineer take first?

Question 11hardmultiple choice
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A network administrator is troubleshooting a DHCP snooping issue on a Cisco switch. The switch is configured with DHCP snooping globally and on VLAN 10. The trusted interface is GigabitEthernet0/1 connected to the DHCP server. However, clients on VLAN 10 are not receiving IP addresses from the DHCP server. What is the most likely cause?

Question 12hardmultiple choice
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A network engineer runs the following command on Switch SW1:

SW1# show spanning-tree vlan 10

VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 32778 Address 0011.2233.4455 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0011.2233.4455 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- -------------------------------- Gi0/1 Desg FWD 4 128.1 P2p Gi0/2 Desg FWD 4 128.2 P2p Gi0/3 Desg FWD 4 128.3 P2p

Based on this output, what can be concluded?

Question 13mediummultiple choice
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Given the following configuration on a Cisco IOS-XE switch:

interface GigabitEthernet0/1
 switchport mode trunk
 switchport trunk native vlan 999
 switchport trunk allowed vlan 10,20,30

What is the effect of this configuration?

Question 14mediumdrag order
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Drag and drop the steps of adding a new VLAN to a trunk link into the correct order, from first to last.

Question 15mediumdrag order
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Drag and drop the steps of configuring a native VLAN mismatch detection into the correct order, from first to last.

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