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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,000 --> 00:00:06,000 align:middle line:84% There are 2 main ways that routes get added to the routing tables or routers. 2 00:00:06,000 --> 00:00:08,000 align:middle line:84% The first way to use static routes 3 00:00:08,000 --> 00:00:12,000 align:middle line:84% where an administrator manually adds a route to the routing table 4 00:00:12,000 --> 00:00:17,000 align:middle line:84% and the second way is to use dynamic routing protocols. 5 00:00:17,000 --> 00:00:24,000 align:middle line:84% So with static routes, you as the administrator are adding the routes to the routing table. 6 00:00:24,000 --> 00:00:28,000 align:middle line:84% The advantage of this method is that there is no overhead 7 00:00:28,000 --> 00:00:32,000 align:middle line:84% on the network, in that, they are no keepalives 8 00:00:32,000 --> 00:00:34,000 align:middle line:84% or constant routing updates sent between routers. 9 00:00:34,000 --> 00:00:40,000 align:middle line:84% RIP or Routing Information Protocol which is an older routing protocol 10 00:00:40,000 --> 00:00:44,000 align:middle line:84% sends it entire routing table every 30 seconds. 11 00:00:44,000 --> 00:00:50,000 align:middle line:84% So when using static routes rather than RIP that overhead is removed. 12 00:00:50,000 --> 00:00:53,000 align:middle line:84% More modern routing protocols such as EIGRP and OSPF 13 00:00:53,000 --> 00:00:59,000 align:middle line:84% remove this constant updating that took place in RIP every 30 seconds 14 00:00:59,000 --> 00:01:02,000 align:middle line:84% but they still send hello's and keepalives 15 00:01:02,000 --> 00:01:05,000 align:middle line:84% on the network which consumes bandwidth. 16 00:01:05,000 --> 00:01:08,000 align:middle line:84% With static routes that is removed 17 00:01:08,000 --> 00:01:14,000 align:middle line:84% but the major disadvantage of static routes is that you as the administrator 18 00:01:14,000 --> 00:01:16,000 align:middle line:84% have to update the routing table 19 00:01:16,000 --> 00:01:20,000 align:middle line:84% which could be a lot of work if you have a large network. 20 00:01:20,000 --> 00:01:25,000 align:middle line:84% Static routes do not automatically taken to account changes in the network 21 00:01:25,000 --> 00:01:30,000 align:middle line:84% you as the administrator would have to manually update 22 00:01:30,000 --> 00:01:36,000 align:middle line:84% the routing table on a router or multiple routers if a link went down 23 00:01:36,000 --> 00:01:40,000 align:middle line:84% so the overhead is not on the network 24 00:01:40,000 --> 00:01:45,000 align:middle line:84% the overhead is on you as the administrator to keep everything updated. 25 00:01:45,000 --> 00:01:50,000 align:middle line:84% Static routes do not scale when networks become large. 26 00:01:50,000 --> 00:01:57,000 align:middle line:84% The amount of work involved in keeping routing tables updated manually is just too great 27 00:01:57,000 --> 00:02:00,000 align:middle line:84% especially when there are lots of topology changes. 28 00:02:00,000 --> 00:02:05,000 align:middle line:84% Static routes do not update routing tables 29 00:02:05,000 --> 00:02:07,000 align:middle line:84% when topology changes in most cases. 30 00:02:07,000 --> 00:02:14,000 align:middle line:84% Now that being said, it is possible these days to monitor IP addresses 31 00:02:14,000 --> 00:02:18,000 align:middle line:84% and for example to remove a route from the routing table 32 00:02:18,000 --> 00:02:20,000 align:middle line:84% if an IP address is no longer available. 33 00:02:20,000 --> 00:02:24,000 align:middle line:84% So it's possible to implement some dynamic options with static routes 34 00:02:24,000 --> 00:02:30,000 align:middle line:84% but the overhead is still large and static routes are cumbersome in large networks. 35 00:02:30,000 --> 00:02:35,000 align:middle line:84% Now static route are still used in lot of networks today 36 00:02:35,000 --> 00:02:39,000 align:middle line:84% the most common example is a default static route 37 00:02:39,000 --> 00:02:45,000 align:middle line:84% your home a DSL or cable or fiber router 38 00:02:45,000 --> 00:02:49,000 align:middle line:84% will typically have a default route to your service provider. 39 00:02:49,000 --> 00:02:54,000 align:middle line:84% So your home router doesn’t know about the routes on the Internet 40 00:02:54,000 --> 00:02:58,000 align:middle line:84% it's simply forwards the traffic to your ISP 41 00:02:58,000 --> 00:03:04,000 align:middle line:84% a default route in a router's routing table basically tells the router 42 00:03:04,000 --> 00:03:07,000 align:middle line:84% when you don’t have a specific network for traffic 43 00:03:07,000 --> 00:03:12,000 align:middle line:84% that you receive in your routing table simply send the packets to the router 44 00:03:12,000 --> 00:03:18,000 align:middle line:84% that’s configured as your default gateway or gateway of last resort. 45 00:03:18,000 --> 00:03:21,000 align:middle line:84% So when you configure a default route on a router 46 00:03:21,000 --> 00:03:24,000 align:middle line:84% you are pointing it to another router 47 00:03:24,000 --> 00:03:29,000 align:middle line:84% which means that router will simply send that traffic to that default gateway 48 00:03:29,000 --> 00:03:34,000 align:middle line:84% when it doesn’t have a more specific route in the routing table. 5881

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