Common Traps on SW1 and SW2 VLAN Trunking Practice Questions
- ·A VLAN must exist and be allowed on the trunk before traffic can cross the link.
- ·Access ports and trunk ports solve different problems.
- ·Native VLAN mismatch and allowed VLAN lists are common causes of confusing trunk behaviour.
Sample Questions
Practice all 15 →A workstation is connected to a managed switch. It obtains a valid IP address (192.168.10.50) from the DHCP server, but it cannot ping the default gateway (192.168.10.1). The link light on both the workstation NIC and the switch port are solid green. Other workstations on the same switch CAN ping the default gateway successfully. The technician accesses the switch management interface and finds that the workstation's port is configured as an access port on VLAN 10. The default gateway is located on VLAN 20. An inter-VLAN router is configured but not explicitly allowing VLAN 10 access to VLAN 20. Which of the following is the MOST likely cause of the problem?
Explanation: The workstation is assigned to VLAN 10 via the switch port configuration, but the default gateway is on a different VLAN (20). Without proper inter-VLAN routing (e.g., a router-on-a-stick with ACLs permitting traffic between VLANs), devices in VLAN 10 cannot reach the gateway on VLAN 20. The DHCP server provided an IP within VLAN 10's subnet, which is correct for that VLAN, but the gateway is in another subnet. The switch port VLAN assignment is the root cause; it should be on VLAN 20 to match the gateway, or inter-VLAN routing must be configured correctly.
A company replaces an unmanaged network switch with a new managed switch in a small office. After reconnecting all devices, some workstations can access the internet, but others cannot. The workstations that cannot access the internet are all connected to ports 1-8 of the new switch, while workstations on ports 9-16 work normally. The router is connected to port 24. The technician checks the switch configuration and finds that all ports are in the default VLAN 1, but ports 1-8 have been accidentally reassigned to VLAN 2. Which of the following is the MOST likely reason the workstations on ports 1-8 cannot access the internet?
Explanation: VLANs create separate broadcast domains. When ports 1-8 are assigned to VLAN 2 and the router is on VLAN 1, workstations on VLAN 2 cannot communicate with the router (their default gateway) unless a Layer 3 device forwards traffic between VLANs. In this basic setup, no inter-VLAN routing is configured, so internet access fails for the isolated workstations. Power cycling the switch would not change the VLAN assignment. Subnet mask configuration on the workstations is irrelevant because they cannot reach the router at all. Trunk mode is used for inter-switch connections, not for connecting endpoints.
A network administrator configures a router with VLANs. Devices on VLAN 10 can successfully ping a web server (IP 192.168.20.10) on VLAN 20. However, when users on VLAN 10 attempt to access the web server via a browser using its IP address, the connection times out. The router's ACLs permit ICMP and TCP/80 traffic between VLANs. Which of the following should the administrator check NEXT?
Explanation: Since ICMP (ping) succeeds but HTTP (TCP 80) fails, the network layer connectivity is working. The likely issue is that the web server's own host firewall is blocking incoming HTTP connections while allowing ICMP. Router ACLs are already permitting HTTP, so checking them again is unnecessary unless misconfigured. DNS is not used because the connection is via IP. DHCP is unrelated to the problem.
A network administrator configures a new managed switch with 24 ports. All ports are in the same VLAN (VLAN 1) by default. The administrator then changes ports 1-12 to VLAN 10 and ports 13-24 to VLAN 20. Computers connected to ports in different VLANs are assigned IP addresses from the same DHCP server. Which of the following is a direct consequence of this configuration?
Explanation: VLANs segment the network at Layer 2, isolating traffic between different VLANs. Without a router or Layer 3 switch, devices in different VLANs cannot communicate even if they share the same physical switch.
A network technician is troubleshooting a connectivity issue. Users on VLAN 10 (192.168.10.0/24) can access the internet but cannot reach a server on VLAN 20 (192.168.20.0/24) by IP address. The router's ACL allows all traffic between VLANs. The technician pings the server IP from a client on VLAN 10 and gets a request timed out. The technician then checks the routing table on the router and sees routes for both VLANs. Which of the following is the NEXT step to isolate the issue?
Explanation: Since the router has routes and the ACL permits traffic, the issue may be elsewhere. A traceroute from the client will show where the packets stop, helping to pinpoint if the problem is on the source VLAN, the router, the destination VLAN, or the server itself. Checking the server's firewall is premature without knowing if traffic reaches it. Verifying the switch port VLAN assignment is a possibility but traceroute gives more direct information. The client's default gateway is likely correct since internet access works.
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Frequently asked questions
How do "SW1 and SW2 VLAN Trunking Practice Questions" appear on the real 220-1101?
Practise switch scenarios involving SW1, SW2, VLANs, trunk links, allowed VLAN lists and show interfaces trunk output. These appear throughout the 220-1101 and require you to apply your knowledge, not just recall facts.
How many scenario questions are on the 220-1101 exam?
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 220-1101. Practicing each scenario type ensures you're ready for any format.
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