Network Layer Delivery Forwarding And Routing Ppt To Pdf

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The delivery of a packet is called direct if the deliverer host or router and the destination are on the same network; the delivery of a packet is called indirect if the deliverer host or router and the destination are on different networks. In the next-hop method, instead of a complete list of the stops the packet must make, only the address of the next hop is listed in the routing table; in the networkspecific method, all hosts on a network share one entry in the routing table. In the host-specific method, the full IP address of a host is given in the routing table. In the default method, a router is assigned to receive all packets with no match in the routing table. The routing table for classless addressing needs at least four columns.

Network Layer

Report Download. The meaning of state is "what groups are active on this link. When a router receives a packet with a multicast destination address, it runs the Dijkstra algorithm to calculate the shortest path tree for that group. The result can be cached in case there are additional packets for that destination. MOSPF requires a new link state update packet to associate the unicast address of a host with the group address or addresses the host is sponsoring This packet is called the group-membership LSA. We make a tree that contains all the hosts belonging to a group, but we use the unicast address of the host in the calculation.

We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you! Published by Collin Doyle Modified over 5 years ago. Permission required for reproduction or display. Delivery - the way a packet is handled by the underlying networks network layer.

1 Chapter 22 Network layer Delivery, Forwarding and Routing.

A routing protocol specifies how routers communicate with each other to distribute information that enables them to select routes between nodes on a computer network. Routers perform the traffic directing functions on the Internet; data packets are forwarded through the networks of the internet from router to router until they reach their destination computer. Routing algorithms determine the specific choice of route. Each router has a prior knowledge only of networks attached to it directly. A routing protocol shares this information first among immediate neighbors, and then throughout the network. This way, routers gain knowledge of the topology of the network. The ability of routing protocols to dynamically adjust to changing conditions such as disabled connections and components and route data around obstructions is what gives the Internet its fault tolerance and high availability.

In Network layer, a router is used to forward the packets. Every router has a forwarding table. A router forwards a packet by examining a packet's header field and then using the header field value to index into the forwarding table. The value stored in the forwarding table corresponding to the header field value indicates the router's outgoing interface link to which the packet is to be forwarded. For example, the router with a header field value of arrives at a router, and then router indexes this header value into the forwarding table that determines the output link interface is 2. The router forwards the packet to the interface 2.

When a device has multiple paths to reach a destination, it always selects one path by preferring it over others. This selection process is termed as Routing. Routing is done by special network devices called routers or it can be done by means of software processes. The software based routers have limited functionality and limited scope. A router is always configured with some default route. A default route tells the router where to forward a packet if there is no route found for specific destination. In case there are multiple path existing to reach the same destination, router can make decision based on the following information:.

Chapter 22 Network Layer: Delivery, Forwarding, and Routing

Report Download. Forwarding requires a host or a router to have a routing table. When a host has a packet to send or when a router has received a packet to be forwarded, it looks at this table to find the route to the final destination. Next-Hop Method is technique to reduce the contents of a routing table,the routing table holds only the address of the next hop instead of information about the complete route Slide 6 6 Host-specific versus network-specific method Instead of having an entry for every destination host connected to the same physical network One entry that defines the address of the destination network itself. All hosts connected to the same network treated as one single entity.

Routing protocol

Embed Size px x x x x Gihan Naguib Behrouz A. Forouzan Data communication and Networking Slide 3 Dr.

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1 chapter 22 network layer delivery, forwarding and routing dr. gihan naguib behrouz a. forouzan...

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Routing.ppt

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  1. Zenadia O. 11.01.2021 at 12:24

    Delivery, Forwarding, The network layer supervises define this handling as the delivery of a packet. Forwarding means to place the packet in its route to UNICAST ROUTING PROTOCOLS table is one with manual entries.