Topic

Forwarding

2 questions in this topic.

2015 Q4(a)Network Layer / IPForwarding· 2 marks

Suppose there are three routers between a source host and a destination host. Ignoring fragmentation, an IP datagram sent from the source host to the destination host will travel over how many interfaces? How many forwarding tables will be indexed to move the datagram from the source to the destination?

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2015 Q4(e)Network Layer / IPForwarding· 2 marks

Suppose Host A sends Host B a TCP segment encapsulated in an IP datagram. When Host B receives the datagram, how does the network layer in Host B know it should pass the segment (that is, the payload of the datagram) to TCP rather than to UDP or to something else?

IPdemultiplexing

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