642-812 Building Converged Cisco Multilayer Switched Networks Exam Questions

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642-812 Building Converged Cisco Multilayer Switched Networks

Note 1: 642-812 Exhibit and all related diagrams are not shown in demo questions.
Note 2: 642-812 Answers are not shown in demo questions.
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Demo Question 9.

Inter-VLAN routing has been implemented in the EliteCertify network. In VLAN routing, what are some of the disadvantages of designing a router-on-stick configuration? (Select three)

A. InterVLAN routing cannot be filtered by the router.
B. The router becomes a single point of failure for the network.
C. Routers will not route STP BPDUs.
D. There is a possibility of inadequate bandwidth for each VLAN.
E. Additional overhead on the router can occur.
F. NetFlow Switching is required for InterVLAN accounting.

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Answer: B, D, E

Explanation: A router connected to a switch via a single trunk link is better known as router-on-stick or even a one armed router. Since there's only one router, if that router were to go down there'd be no backup. Since there's only one router, that router would have to handle all the bandwidth of every VLAN so there's a chance it could be overloaded, as with the overhead problems of being responsible for too much. Because traffic routed between the VLANs traverse a single physical port, there is the potential to not provide for enough bandwidth for a VLAN at any given time. Inter-VLAN routing also does indeed require additional configuration, management, and overhead. Incorrect