Switches use mac address tables to forward ethernet frames and routers use a routing table to learn where to forward ip packets to. Huawei routers routing basics rip principles youtube. Sent by a router when booted, or when an entry timesout. Routers and routing basics ccna 2 companion guide cisco. It is an internetworking device used to connect two or more different networks. The router uses its routing table to determine the best path to forward the packet. After configuration, the routing protocol of both routers automatically exchanges the information of locally.
Cisco ios router configuration commands cheat sheet pdf. Routing protocols routers use routing protocols to exchange routing information with each other igp is used to refer to the process running on routers inside an isps network egp is used to refer to the process running between routers bordering directly connected isp networks. Configure the device name as shown in the topology. He talks about distance vector and link state routing. Administrative distance 90 internal, when routers are connected in the same autonomous system, 170 external, when routers are connected in different autonomous system. A given layer in the osi model generally communicates with. Routers and routing basics ccna 2 labs and study guide. Pdf introduction to router and routing basics researchgate.
Thus, a router essentially acts as a dispatcher of data through the most efficient channels between networks. Configure basic settings on a router to route between two directlyconnected networks, using cli. A router uses ip to forward packets from the source network to the destination network. In this course, instructor russell long helps you prepare for the exam and understand the basics of layer 3 routing. Chapter 3, configuring a router this chapters first focuses on basic router.
Four, the router forwards that out though the interface thats closest to the remote network. The router can then build a routing table a map of the internetwork that describes the path of how to find remote networks. An administrator configures the same routing protocol on both routers. The network basics of bridging, routing, and switching. What does routing and switching have to do with network security. A routing protocol allows routers to share information about networks and their proximity to each other. The router accepts all traffic from the internet addressed to network.
Two, the router examines the destination ip of this packet. Eigrp uses diffusing update algorithm dual to choose the best path from the source to the destination. The fundamentals of routing ee122 fall 2011 scott shenker. Understanding basics of eigrp routing protocol features of eigrp. Routers which exchange routing information announce send routing information to a neighbour accept receive and use routing information sent by a neighbour originate insert routing information into external announcements usually as a result of the igp peers routers in neighbouring ass or within one as which exchange routing. And because ip addresses have both a network and a host address, a router can determine what network a message is coming from and going to. A routing protocol is the communication used between routers. Think of ethernet switches operating at layer 2 of the osi model and routers operating one layer up at layer 3. He also talks about the various type of routing protocols. Efficient routing is an important part of any it administrators job. Three, the router then looks up the destination network of this ip in its routing table. You put a few million gates on the surface of the chip in some sensible way. Once the card reaches the postal code, the appropriate delivery post of. Routing updates generally consist of all or a portion of a routing table.
Bgp maintains a separate routing table based on shortest as path and various other attributes, as opposed to igp metrics like distance or cost. For example, many routing protocols use network protocols to exchange information between routers. By analyzing routing updates from all routers, a router can build a detailed picture of network topology. Basics of tcpip, switching, routing and firewalling. Pdf module 1 router basic configuration and static. At its most basic, a router is used to rout out, or hollow out, a hole or groove in a piece of wood, metal, or plastic, producing finished edges, cutaways, curved contours, and precise holes. We focus on maze routing, which is a classical and powerful technique with the virtue that one can add much sophisticated functionality on top of a rather simple core algorithm. Adding a connected network to the routing table router interfaces each router interface is a member of a different network activated using the no shutdown command in order for static and dynamic routes to exist in routing.
Routers use this information to build and maintain routing tables. Interface configuration table router 1 interface assignment ip address. Verify connectivity between two networks that are directly connected to a router. A router is a network layer device, so it can work with the network packets at a higher level. Module 1 router basic configuration and static routing. Huawei getting started with the basics of ip video series are entrylevel materials that help you learn data communication knowledge. Perform basic configuration tasks on a switched lan and router. Router plays an important role in network routing or network flows forwarding, in general router forwards the packet from one device to other device through the best path. It also includes configuration examples and verification steps whenever possible. After configuration, the routing protocol of both routers automatically exchanges the information of locally available networks. Routers communicate with one another and maintain their routing tables through the transmission of a variety of messages.
Each routerhost has a routing table, indicating the path or the next hop for a given destination host or a network. Since these kinds of posts are useful as a reference for many people, i have decided to create also a cisco router commands cheat sheet with the most useful and the most frequently used command line. A given layer in the osi model generally communicates. Cisco router configuration commands cli cheat sheet in a previous post, i have published a cisco switch commands cheat sheet tutorial. Assign class as the encrypted privileged exec mode password. Configure some basic ospf routing scenarios page 5 configuring ospf on a network using the network command to define active ip interfaces the network command defines a range of ip addresses. An as is a collection of networks under a common administration that share a common routing. Any ip interface on the switch that has an ip address within the range will run ospf.
The router uses a routing table to determine the path. Introduction to networking basic routing principles. A router including a wireless router is a specialized networking device connected to two or more networks running software that allows the router to move data from one network to another. Basic router configuration routing protocols and concepts. Routing protocols are network layer protocols that are responsible for exchanging information between routers so that the routers can select the proper path for network traffic. A network node, which is just a device that forwards packets toward a destination, can be a router, bridge, or switch. As soon as you take a brand new router out of the box it will build a routing table but the only information youll find are the directly connected interfaces. In particular, a router can examine the ip address of the packets that pass through it. The routing table each router host has a routing table, indicating the path or the next hop for a given destination host or a network the router host tries to match the destination address of a packet against entries in the routing table if there is a match, the router forwards it to the corresponding. Routing tables routing is carried out in a router by consulting routing table. The primary function of a router is to connect networks together and keep certain kinds of. Basic router configuration this module provides configuration procedures for cisco 3900 series, cisco 2900 series, and cisco 1900 series integrated services routers isrs.
Router functions in an internet protocol based network operate at the network layer osi models layer 3. How to use a router for woodworking beginners bob vila. No unique format for routing tables, typically table contains. Ethernet switches and routers have distinct purposes and when the two devices are included in the same enclosure like a switchrouter it is sometimes difficult to separate the two functions. Global routing state means collection of routing state in each of the routers will focus on where this routing state comes from but first, a few preliminaries. Routing protocols routers use routing protocols to exchange routing information with each other igp is used to refer to the process running on routers inside an isp s network egp is used to refer to the process running between routers bordering directly connected isp networks 37. Finally, network protocols are the various upperlayer protocols that exist in a given protocol suite.
Routers and routing basics ccna 2 companion guide is the official supplemental textbook for the ccna 2 course of the cisco networking academy program. Bgp was not built to route within an autonomous system as, but rather to route between ass. A routing protocol, after configuration, shares locally available networks information with other routers running the same routing protocol. Completely revised from the previous edition with new examples and explanations, this textbook includes original material developed by the authors, yet it fully aligns with the ccna 2 curriculum. They operate on different layers of a networking protocol layered protocols make it easier to modify and implement the networking task. The fundamentals of routing university of california. One, a router receives a packet of data on one of its interfaces. Routing and switching basics for cyber and network security. Ip forwarding p router decides which interface a packet is sent to p forwarding table populated by routing process p forwarding decisions. A linkstate advertisement is another example of a message. In this video, imran introduces the concept of routing. A basic routing problem in the postal network, then, is as follows. Routers perform a role similar to that of switches, but on a much larger scale.
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