qr code c# tutorial 19: Basic Routing in Objective-C

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19: Basic Routing
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You should be familiar with troubleshooting connectivity problems Look for incorrect static routes, incorrect or missing network commands, running different routing protocols on connected routers, miscon gured addresses on
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interfaces (addresses in different subnets), no addresses on interfaces, disabled interfaces, different RIP versions on routers, and miscon gured VLANs on switches, for example
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INSIDE THE EXAM
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Static Routes
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Be familiar with when static routes are used versus a dynamic routing protocol Understand the syntax of the ip route command and the default values, if omitted Know how to configure a default route Be able to find misconfigured static routes in a router s configuration Know how to read the output of the show ip route command and to find the administrative distance and metric values of dynamic routing protocols in this output Don t be surprised if you see a simulation question on the exam for which you have to configure or troubleshoot a dynamic routing protocol RIPv2, OSPF, or EIGRP on multiple routers
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Understand the differences between RIPv1 and RIPv2 and be able to compare and contrast these protocols Be able to configure RIPv2 successfully on a router Understand the output of the show ip protocols and debug ip rip commands to troubleshoot routing and connectivity problems Understand the problems debug commands can create on a router and how to disable debug
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Dynamic Routing Protocol Basics
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Remember the two things that need to happen to enable routing on a router: enabling the routing protocol by assigning networks to it and activating interfaces by enabling and assigning addresses to them
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Certi cation Summary
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CERTIFICATION SUMMARY
Two types of routing protocols can be used to define or learn destination networks: static and dynamic To create a static route, use the ip route command For a default route, use 0000/0 as the network number and subnet mask To view your router s routing table, use the show ip route command When setting up IP routing, you must enable the routing protocol and configure IP routing on your router s interfaces The router command takes you into the routing process, while the network command specifies what interfaces will participate in the routing process Use the ip address command to assign IP addresses to your router s interfaces RIPv1 generates local broadcasts every 30 seconds to share routing information, with a hold-down period of 180 seconds Hop count is used as the metric for choosing paths RIP can load-balance across six equal-cost paths to a single destination RIPv2 uses multicasts instead of broadcasts and also supports VLSM for hierarchical routing and route summarization RIPv2, to speed up convergence, uses triggered updates Use the router rip command to go into the routing process and the network command to specify your connected networks When specifying your connected networks, specify only the Class A, B, or C network number (not subnet numbers), since RIPv1 is classful: even though RIPv2 is classless, configure it as a classful protocol Use the version command to enable RIPv2 The debug ip rip command will display the actual routing contents that your router advertises in its updates or receives in neighbors updates The show ip protocols command displays information about the IP routing protocols currently configured and running on your router It shows metric information, administrative distances, neighboring routers, and routes that are being advertised The show ip route command displays the IP routing information currently being used by your router An R in the left-hand column indicates a RIP route
19: Basic Routing
TWO-MINUTE DRILL
Static Routes
Use the ip route command to configure a static route After the subnet mask parameter, you have two ways of specifying how to
reach the destination network: you can tell the router either the next hop neighbor s IP address or the interface the router should exit to reach the destination network The former has an administrative distance of 1 and the latter, 0 (a directly connected route)
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