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  • Answers Explanation Hints

  • A high school uses VLAN15 for the laboratory network and VLAN30 for the faculty network. What is required to enable communication between these two VLANs while using the router-on-a-stick approach

  • When routing a large number of VLANs, what are two disadvantages of using the router-on-a-stick inter-VLAN routing method rather than the multilayer switch inter-VLAN routing method

  • Which error is most likely causing this problem​

  • What is a characteristic of a routed port on a Layer 3 switch

  • A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw(config-if) ip address 172.18.33.88 255.255.255.0 command

  • A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw configure terminal command

  • A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw(config-if) shutdown command

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    Which four steps are needed to configure a voice VLAN on a switch port? (Choose four).

    • Configure the interface as an IEEE 802.1Q trunk.

    • Assign the voice VLAN to the switch port.

    • Activate spanning-tree PortFast on the interface.

    • Ensure that voice traffic is trusted and tagged with a CoS priority value.

    • Add a voice VLAN.

    • Configure the switch port interface with subinterfaces.

    • Assign a data VLAN to the switch port.

    • Configure the switch port in access mode.

      Answers Explanation & Hints:

      To add an IP phone, the following commands should be added to the switch port:
      SW3(config-vlan)# vlan 150
      SW3(config-vlan)# name voice
      SW3(config-vlan)# int fa0/20
      SW3(config-if)# switchport mode access
      SW3(config-if)# mls qos trust cos
      SW3(config-if)# switchport access vlan 150

  • Refer to the exhibit. PC1 is unable to communicate with server 1. The network administrator issues the show interfaces trunk command to begin troubleshooting. What conclusion can be made based on the output of this command?

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 01

      • Interface G0/2 is not configured as a trunk.

      • VLAN 20 has not been created.

      • The encapsulation on interface G0/1 is incorrect.

      • The DTP mode is incorrectly set to dynamic auto on interface G0/1.

        Answers Explanation & Hints:

        In the show interfaces trunk output, the G0/2 interface of DLS1 is not listed. This indicates the interface has probably not been configured as a trunk link.

    1. Refer to the exhibit. What is the cause of the error that is displayed in the configuration of inter-VLAN routing on router CiscoVille?

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 14

      • The gig0/0 interface does not support inter-VLAN routing.

      • The no shutdown command has not been configured.

      • The IP address on CiscoVille is incorrect.

      • The encapsulation dot1Q 20 command has not been configured.​  

        Answers Explanation & Hints:

        The steps to configure inter-VLAN routing must be completed in a specific order. Before configuring an IP address on a subinterface, the encapsulation dot1q VLAN_id command must be specified first.

    1. Refer to the exhibit. A network administrator has configured router CiscoVille with the above commands to provide inter-VLAN routing. What command will be required on a switch that is connected to the Gi0/0 interface on router CiscoVille to allow inter-VLAN routing?​

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 12

      • switchport mode access

      • no switchport

      • switchport mode trunk

      • switchport mode dynamic desirable

        Answers Explanation & Hints:

        When they are configured for inter-VLAN routing, routers do not support the dynamic trunking protocol that is used by switches. For router-on-a-stick configurations to function, a connected switch must use the command switchport mode trunk .

    1. A high school uses VLAN15 for the laboratory network and VLAN30 for the faculty network. What is required to enable communication between these two VLANs while using the router-on-a-stick approach?

      • A multilayer switch is needed.

      • A router with at least two LAN interfaces is needed.

      • Two groups of switches are needed, each with ports that are configured for one VLAN.

      • A switch with a port that is configured as a trunk is needed when connecting to the router.

        Answers Explanation & Hints:

        With router-on-a-stick, inter-VLAN routing is performed by a router with a single router interface that is connected to a switch port configured with trunk mode. Multiple subinterfaces, each configured for a VLAN, can be configured under the single physical router interface. Switches can have ports that are assigned to different VLANs, but communication between those VLANs requires routing function from the router. A multilayer switch is not used in a router-on-a-stick approach to inter-VLAN routing.

    2. When routing a large number of VLANs, what are two disadvantages of using the router-on-a-stick inter-VLAN routing method rather than the multilayer switch inter-VLAN routing method? (Choose two.)

      • Multiple SVIs are needed.

      • A dedicated router is required.

      • Router-on-a-stick requires subinterfaces to be configured on the same subnets.

      • Router-on-a-stick requires multiple physical interfaces on a router.

      • Multiple subinterfaces may impact the traffic flow speed.

        Answers Explanation & Hints:

        With the router-on-a-stick inter-VLAN routing method, a dedicated router is required. It only needs one physical interface on the router to route traffic among multiple VLANs, by using subinterfaces on one physical interface. On the other hand, since traffic of all VLANs will have to go through the same physical interfaces, the throughput will be impacted. Also, a multilayer switch can use multiple SVIs to perform inter-VLAN routing.

    3. Refer to the exhibit. A network administrator is verifying the configuration of inter-VLAN routing. Users complain that PCs on different VLANs cannot communicate. Based on the output, what are two configuration errors on switch interface Gi1/1? (Choose two.)

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 11

      • Gi1/1 is in the default VLAN.

      • Voice VLAN is not assigned to Gi1/1.

      • Gi1/1 is configured as trunk mode.

      • Negotiation of trunking is turned on on Gi1/1.

      • The trunking encapsulation protocol is configured wrong.

        Answers Explanation & Hints:

        With legacy inter-VLAN routing methods, the switch ports that connect to the router should be configured as access mode and be assigned appropriate VLANs. In this scenario, the Gi1/1 interface should be in access mode with VLAN 10 assigned. The other options are default settings on the switch and have no effect on legacy inter-VLAN routing.

    1. Refer to the exhibit. A network administrator is verifying the configuration of inter-VLAN routing. Users complain that PC2 cannot communicate with PC1. Based on the output, what is the possible cause of the problem?

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 10

      • Gi0/0 is not configured as a trunk port.

      • The command interface GigabitEthernet0/0.5 was entered incorrectly.

      • There is no IP address configured on the interface Gi0/0.

      • The no shutdown command is not entered on subinterfaces.

      • The encapsulation dot1Q 5 command contains the wrong VLAN. 

        Answers Explanation & Hints:

        In router-on-a-stick, the subinterface configuration should match the VLAN number in the encapsulation command, in this case, the command encapsulation dot1Q 10 should be used for VLAN 10. Since subinterfaces are used, there is no need to configure IP on the physical interface Gi0/0. The trunk mode is configured on the switch port that connects to the router. The subinterfaces are turned on when they are added.

    1. Refer to the exhibit. A network administrator has configured router CiscoVille with the above commands to provide inter-VLAN routing. What type of port will be required on a switch that is connected to Gi0/0 on router CiscoVille to allow inter-VLAN routing?

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 13

      • routed port

      • access port

      • trunk port

      • SVI

        Answers Explanation & Hints:

        To allow a router-on-a-stick configuration to function, a switch must be connected to the router via a trunk port to carry the VLANs to be routed. An SVI would be used on a multilayer switch where the switch is performing inter-VLAN routing.

    1. Refer to the exhibit. A network administrator is configuring RT1 for inter-VLAN routing. The switch is configured correctly and is functional. Host1, Host2, and Host3 cannot communicate with each other. Based on the router configuration, what is causing the problem?

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 06

      • Interface Fa0/0 is missing IP address configuration information.

      • IP addresses on the subinterfaces are incorrectly matched to the VLANs.

      • Each subinterface of Fa0/0 needs separate no shutdown commands.

      • Routers do not support 802.1Q encapsulation on subinterfaces.

        Answers Explanation & Hints:

        Since Host 1 (in VLAN 20) has the IP 172.18.1.10/27, the subinterface Fa0/0.1 should be configured with an IP address in the network 172.168.1.0/27. Similarly, Fa0/0.2 should be with an IP address in the network 172.168.1.64/27 and Fa0/0.3 should be with an IP address in the network 172.168.1.96/27.

    1. Refer to the exhibit. A router-on-a-stick configuration was implemented for VLANs 15, 30, and 45, according to the show running-config command output. PCs on VLAN 45 that are using the 172.16.45.0 /24 network are having trouble connecting to PCs on VLAN 30 in the 172.16.30.0 /24 network. Which error is most likely causing this problem?​

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 05

      • The wrong VLAN has been configured on GigabitEthernet 0/0.45.

      • The command no shutdown is missing on GigabitEthernet 0/0.30.

      • The GigabitEthernet 0/0 interface is missing an IP address.

      • There is an incorrect IP address configured on GigabitEthernet 0/0.30.

        Answers Explanation & Hints:

        he subinterface GigabitEthernet 0/0.30 has an IP address that does not correspond to the VLAN addressing scheme. The physical interface GigabitEthernet 0/0 does not need an IP address for the subinterfaces to function. Subinterfaces do not require the no shutdown command.

    1. What is a characteristic of a routed port on a Layer 3 switch?

      • It supports trunking.

      • It is not assigned to a VLAN.

      • It is commonly used as a WAN link.

      • It cannot have an IP address assigned to it.

        Answers Explanation & Hints:

        A routed port on a Layer 3 switch is commonly used for connecting between distribution and core layer switches or between a Layer 3 switch and a router. This port does not get VLAN or trunking commands assigned to it. Instead, the port is programmed with an IP address. This is commonly used when static routing is configured on the switch or when a routing protocol is being run between the Layer 3 switch and the router or another Layer 3 switch.

    2. Refer to the exhibit. A network administrator needs to configure router-on-a-stick for the networks that are shown. How many subinterfaces will have to be created on the router if each VLAN that is shown is to be routed and each VLAN has its own subinterface?

    CCNA2 v7 SRWE – Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers 15

      • 1

      • 2

      • 3

      • 4

      • 5

        Answers Explanation & Hints:

        Based on the IP addresses and masks given, the PC, printer, IP phone, and switch management VLAN are all on different VLANs. This situation will require four subinterfaces on the router.

    1. A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw(config-if)# mdix auto command?

      • It automatically adjusts the port to allow device connections to use either a straight-through or a crossover cable.

      • It applies an IPv4 address to the virtual interface.

      • It applies an IPv6 address to the virtual interface.

      • It permits an IPv6 address to be configured on a switch physical interface.

      • It updates the MAC address table for the associated port.

    2. A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw(config-if)# ip address 172.18.33.88 255.255.255.0 command?

      • It applies an IPv4 address to the virtual interface.

      • It applies an IPv6 address to the virtual interface.

      • It activates a virtual or physical switch interface.

      • It permits an IPv6 address to be configured on a switch physical interface.

      • It updates the MAC address table for the associated port.

    3. A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw# configure terminal command?

      • It enters the global configuration mode.

      • It enters configuration mode for a switch virtual interface.

      • It applies an IPv4 address to the virtual interface.

      • It updates the MAC address table for the associated port.

      • It permits an IPv6 address to be configured on a switch physical interface.

    4. A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw# configure terminal command?

      • It enters the global configuration mode.

      • It saves the running configuration to NVRAM.

      • It disables a virtual or physical switch interface.

      • It updates the MAC address table for the associated port.

      • It saves the startup configuration to the running configuration.

    5. A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw(config-if)# shutdown command?

      • It disables a virtual or physical switch interface.

      • It saves the running configuration to NVRAM.

      • It activates a virtual or physical switch interface.

      • It updates the MAC address table for the associated port.

      • It saves the startup configuration to the running configuration.
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