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Q:

Why is BGP a better choice for Internet routing than the IGPs? 

Answer:
Q:

What are the six OSPF route types?

Answer

Intra-area, inter area, El, E2, Nl, and N2.

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Q:

What are the purposes of areas in an OSPF network?

Answer

Areas allow the design of a hierarchical network. Routes can be summarized or blocked in an area to reduce the amount of routing information on internal OSPF routers.

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Q:

Explain the difference between the forwarding of a unicast IP packet and the forwarding of a multicast IP packet.

Answer

Unicast IP packets are forwarded based on the destination IP address. Multicast packets are forward based on the source IP address. If a multicast packet is received on the interface used to send a unicast packet back to the source, the multicast packet is forwarded to multicast neighbors. If the multicast packet is received on an interface that would not be used to send a unicast IP packet back to the source, the packet is discarded.

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Q:

What is the first thing that BGP checks to determine if a prefix is accessible?

Answer

BGP checks the NEXT_HOP attribute to determine if the NEXT_HOP is accessible or in the IP routing table.

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Q:

What is the purpose of the LOCAL_PREF attribute?

Answer

If a router has more than one route to the same IP prefix, the best path is the one with the highest LOCAL_PREF (assuming the WEIGHT attribute for the routes is equal).

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