Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 124.  B.  802.1Q is the trunking protocol that should be used for tagging VLANs when you 

are routing between VLANs on a router. 802.1x is a protocol that authenticates layer 

2 communications. Inter-Switch Link (ISL) is a Cisco proprietary protocol and it’s not 

always supported. The VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol 

that helps propagate VLAN configuration to other switches.

 125.  D.  The command 

encapsulation dot1q 2 will associate the subinterface with VLAN 

2. If you specify the native tag after the command, it will make this subinterface the 

native VLAN for the trunk. The command 

switchport native vlan 2 is incorrect. The 

command 

interface gi 0/1.2 native is incorrect. The command native vlan 2 is 

incorrect.

 126.  A.  When configuring an IP address on an SVI, you must enter the interface of the VLAN. 

Once in the pseudo interface, you enter the 

ip address command and then enter no 

shutdown. Entering the command interface vlan 10 and then configuring ip address 

192.168.10.1/24 will not work because the commands are not followed by a no 

shutdown command. The IP address is also entered in CIDR format and not the proper 

dot-decimal notation. When entering 

vlan 10, you will be placed inside the VLAN 

configuration prompt and not the Switched Virtual Interface (SVI).

 127.  A.  When you are configuring a router on a stick (ROAS), the switch port of the switch 

must be in trunk mode. This is so that traffic can be tagged as it gets sent to the router, 

which will see the tag and route it accordingly by the destination IP address. In an access 

mode, the VLAN information is stripped from the frame before it enters or leaves the 

interface. In routed mode, the interface performs as a routed interface. In switched mode, 

the interface can perform as an access mode or trunk mode switch port.

 128.  B.  A best practice is to always name the subinterface the same as the VLAN number 

you are going to route. An example is if you are connected to Fa0/1 on the router and 

you want to create an IP address on the subinterface for VLAN 2. Then you would name 

the subinterface Fa0/1.2. The subinterface will not allow you to name it with a friendly 

name, unlike Cisco switches that allow for a friendly name to be associated with VLANs. 

Although you can configure a subinterface from 1 through 65535 and higher with various 

IOS versions, the default gateway cannot be sensibly represented. Naming the subinterface 

the same as the switch’s interface number is not very useful in identifying the VLAN.

 129.  C.  The command 

encapsulation dot1q 5, when configured inside of the subinterface, 

will program the subinterface to accept frames for VLAN 5. The command 

interface 

gi 0/1.5 is incorrect. The command vlan 5 is incorrect. The command switchport 

access vlan 5 is incorrect.

 130.  B.  On 2960-XR switches, you must enable the Switching Database Manager (SDM) for 

LAN Base routing to enable routing. The switch then requires a reload before you can 

configure routable SVIs. The command 

ip lanbase is incorrect. The command sdm 

lanbase-routing is incorrect. The command sdm routing is incorrect.

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Chapter 3: IP Connectivity (Domain 3)