READ Free Dumps For Cisco- 200-125
| Question ID 13629 | Which three elements must be used when you configure a router interface for VLAN
trunking? (Choose three.)
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| Option A | one physical interface for each subinterface
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| Option B | one IP network or subnetwork for each subinterface
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| Option C | a management domain for each subinterface
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| Option D | subinterface encapsulation identifiers that match VLAN tags
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| Option E | one subinterface per VLAN
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| Option F | subinterface numbering that matches VLAN tags
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| Correct Answer | B,D,E |
Explanation Explanation: This scenario is commonly called a router on a stick. A short, well written article on this operation can be found here: http://www.thebryantadvantage.com/RouterOnAStickCCNACertificationExamTutorial.html
| Question ID 13630 | On a corporate network, hosts on the same VLAN can communicate with each other, but
they are unable to communicate with hosts on different VLANs. What is needed to allow
communication between the VLANs?
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| Option A | a router with subinterfaces configured on the physical interface that is connected to the switch
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| Option B | a router with an IP address on the physical interface connected to the switch
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| Option C | a switch with an access link that is configured between the switches
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| Option D | a switch with a trunk link that is configured between the switches
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| Correct Answer | A |
Explanation Explanation: Different VLANs can't communicate with each other, they can communicate with the help of Layer3 router. Hence, it is needed to connect a router to a switch, then make the sub- interface on the router to connect to the switch, establishing Trunking links to achieve communications of devices which belong to different VLANs. When using VLANs in networks that have multiple interconnected switches, you need to use VLAN trunking between the switches. With VLAN trunking, the switches tag each frame sent between switches so that the receiving switch knows to what VLAN the frame belongs. End user devices connect to switch ports that provide simple connectivity to a single VLAN each. The attached devices are unaware of any VLAN structure. By default, only hosts that are members of the same VLAN can communicate. To change this and allow inter-VLAN communication, you need a router or a layer 3 switch. Here is the example of configuring the router for inter-vlan communication RouterA(config)#int f0/0.1 RouterA(config-subif)#encapsulation ? dot1Q IEEE 802.1Q Virtual LAN RouterA(config-subif)#encapsulation dot1Q or isl VLAN ID RouterA(config-subif)# ip address x.x.x.x y.y.y.y