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Why hierarchical routing is employed in Internet 2.2.What are the tw

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2.3 What is hot potato routing
Hot potato routing is a routing technique enabling packet
routing without storing them in buffers. Instead, this technique
continuously transfers data packets until they reach their
destination without the packets having to wait or be stored in a
buffer. It is the practice of passing traffic off to another
autonomous system as quickly as possible, thus using their
network for wide-area transit.
This technique is most commonly used in optical networks
where messages cannot be stored in any medium. Hot potato
routing is used when individual communication links cannot
support more than one packet at a time.
Hot potato routing is also known as deflection routing.
2.4 Difference between RIP and OSPF
Both RIP and OSPF are examples of interior routing protocols.
RIP stands for Routing Information Protocol and OSPF stands
for Open Shortest Path First.
RIP is a distance vector protocol and OSPF is a link state
protocol.
In RIP protocol, networks are not divided in areas or tables. The
metrics used in OSPF are bandwidth and delay.
In RIP maximum hop count is 15. In OSPF no hop count.
In RIP protocol, networks are not divided in areas or tables. In
OSPF, routing is carried out in autonomous system, into areas,
sub areas as well as backbone areas.

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