Why hierarchical routing is employed in Internet? 2.2.What are the two major jobs of inter-AS routing? 2.3.What is hot potato routing? 2.4.What are the major differences between RIP and OSPF? Solution 2.1why hierarchical routing is employed in internet Hierarchical routing is the procedure of arranging routers in a hierarchical manner. A good example would be to consider a corporate intranet. Most corporate intranets consist of a high speed backbone network. It decreases the complexity of network topology, increases routing efficiency, and causes much less congestionbecause of fewer routing advertisements. When the network size grows, the number of routers in the network increases. Consequently, the size of routing tables increases, as well, and routers can\'t handle network traffic as efficiently. We use hierarchical routing to overcome this problem. 2.2 two major jobs of inter AS routing Inter As routing propagates reachability info to all internal router. To configure the forwarding table, router 1d must determine towards which gateway it should forward packets for dest.. 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. .

1. Why hierarchical routing is employed in Internet? 2.2.What are the two major jobs of inter-AS
routing? 2.3.What is hot potato routing? 2.4.What are the major differences between RIP and
OSPF?
Solution
2.1why hierarchical routing is employed in internet
Hierarchical routing is the procedure of arranging routers in a hierarchical manner. A good
example would be to consider a corporate intranet. Most corporate intranets consist of a high
speed backbone network. It decreases the complexity of network topology, increases routing
efficiency, and causes much less congestionbecause of fewer routing advertisements. When the
network size grows, the number of routers in the network increases. Consequently, the size of
routing tables increases, as well, and routers can't handle network traffic as efficiently. We use
hierarchical routing to overcome this problem.
2.2 two major jobs of inter AS routing
Inter As routing propagates reachability info to all internal router.
To configure the forwarding table, router 1d must determine towards which gateway it should
forward packets for dest..
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. 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.