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These are the user uploaded subtitles that are being translated: 1 00:00:00,240 --> 00:00:07,320 Before doing a demonstration a quick recap of a writing table what is a writing table a writing table 2 00:00:07,610 --> 00:00:15,270 is a list of networks that the reader knows about as well as information about how to reach those networks. 3 00:00:15,480 --> 00:00:21,710 In other words a router may have a Network 10 1 1 0 or 24 in the routing table. 4 00:00:21,780 --> 00:00:28,350 That entry may also contain information such as the outgoing local interface and the next top Rodda 5 00:00:28,380 --> 00:00:31,180 to use to get to that destination. 6 00:00:31,260 --> 00:00:35,670 Each entry in the writing table is a destination network. 7 00:00:35,790 --> 00:00:41,520 If you are using a unique cost or writing protocol and once again includes the local interface to use 8 00:00:41,520 --> 00:00:46,700 to get to the neighbor or the next hop to get to that destination. 9 00:00:46,710 --> 00:00:51,780 Now there are various types of routes that are included in a writing table including directly connected 10 00:00:51,840 --> 00:00:53,050 networks. 11 00:00:53,160 --> 00:00:59,940 These networks are added to the writing table automatically and is a network that is directly connected 12 00:01:00,120 --> 00:01:02,780 to one of the interfaces on the local router. 13 00:01:03,120 --> 00:01:08,940 If the interface goes down well in other words fails or you shut down the interface. 14 00:01:08,940 --> 00:01:14,630 In other words it's administratively down that a network is removed from the writing table. 15 00:01:14,640 --> 00:01:16,550 The second type is static routes. 16 00:01:16,860 --> 00:01:23,070 Static routes are routes that you as the administrator have manually added to the configuration of the 17 00:01:23,070 --> 00:01:23,710 router. 18 00:01:24,060 --> 00:01:29,660 Static Grotz are very good for small simple networks that don't change often. 19 00:01:29,670 --> 00:01:35,700 However if your networks very large static routes don't work well because of the amount of work it is 20 00:01:35,940 --> 00:01:42,840 to maintain those writing entries static Roths also do not dynamically adjust to changes in the network 21 00:01:42,840 --> 00:01:43,980 topology. 22 00:01:43,980 --> 00:01:50,220 So if you're telling a rodded to go right to get to a destination and the network is down the road it 23 00:01:50,220 --> 00:01:57,340 will still send traffic to the right rather than going to the left as an example to get to the destination. 24 00:01:57,360 --> 00:01:59,950 The third type is a default route. 25 00:02:00,060 --> 00:02:02,720 You can manually configure a default route. 26 00:02:02,880 --> 00:02:09,450 It's a special type of static route or a routing protocol can dynamically add it to the writing table 27 00:02:10,020 --> 00:02:16,380 a default route is an optional route that is used when no explicit path to a destination is found in 28 00:02:16,380 --> 00:02:17,780 the writing table. 29 00:02:17,790 --> 00:02:24,510 So if a specific route like 10 1 1 0 slushed 24 is not in the writing table the default wrocht can be 30 00:02:24,510 --> 00:02:27,380 used to get to the destination. 31 00:02:27,550 --> 00:02:34,030 In this typology I have three routers Router one Rodda two to three I've configured loopback on each 32 00:02:34,030 --> 00:02:34,570 router. 33 00:02:34,660 --> 00:02:40,230 So quadruple one and right one could ripple to route it to quadruple three and rotatory first. 34 00:02:40,270 --> 00:02:46,980 Ethan it is 0 0 on Rotto 1 and Rodda 2 is in the 10 1 1 0 slash 24 network. 35 00:02:47,110 --> 00:02:59,730 If there is one on Rodda 2 and if 0 0 3 are in the 10 1 2 0 slushed 24 network has wrought a one show 36 00:02:59,760 --> 00:03:03,860 IP interface brief. 37 00:03:04,000 --> 00:03:06,570 I can see that IP address 10.0 wandered wondered. 38 00:03:06,590 --> 00:03:16,100 One is configured on first East and it is 0 0 and 1 dog wandered 1.1 is configured on loop back to 0. 39 00:03:16,120 --> 00:03:23,680 Show IP route in the output we can see that two directly connected networks have been added to the writing 40 00:03:23,680 --> 00:03:32,550 table of Rato one 10 1 1 0 slushed 24 is directly connected to Fost. 41 00:03:32,550 --> 00:03:34,520 Ethan it is 0 0. 42 00:03:34,530 --> 00:03:41,070 Its important to remember that routers and layer 3 switches route based on networks and subnets and 43 00:03:41,070 --> 00:03:44,650 not based on IP addresses show run interface Fost. 44 00:03:44,670 --> 00:03:54,360 Ethan It is 00 shows me that the IP address configured on FASA Ethan it is 0 0 is 10 that wandered wondered 45 00:03:54,410 --> 00:04:00,610 1 slash 24 but the IP address is not added to the writing table. 46 00:04:00,660 --> 00:04:07,480 The network is added to the writing table as a directly connected network on fust. 47 00:04:07,500 --> 00:04:15,690 Ethan it is 0 0 and its shown in the writing table we're denoted in the writing table as a C which means 48 00:04:16,020 --> 00:04:18,780 connected network. 49 00:04:18,830 --> 00:04:24,710 When you add an IP address to an interface and that interface is up the road has added to the writing 50 00:04:24,710 --> 00:04:25,270 table. 51 00:04:26,180 --> 00:04:34,660 So let's prove that interface loop back one IP address actually before I put the IP address on let's 52 00:04:34,660 --> 00:04:38,790 have a look at the writing table do show IP ront. 53 00:04:38,940 --> 00:04:43,120 Notice we only see two metrics in the writing table. 54 00:04:43,530 --> 00:04:56,040 However if I configure an additional network so $1.1 1 to slash 32 on this new loopback and now use 55 00:04:56,040 --> 00:05:02,000 the command to show IP route notice we have a third route in the writing table. 56 00:05:02,340 --> 00:05:13,840 We have 1.1 1.1 slashed 32 and 1.1 one to slash 32 this network is configured to loop back zero. 57 00:05:13,840 --> 00:05:17,160 And this network is configured on loopback back one. 58 00:05:17,230 --> 00:05:25,250 The reason these display as IP addresses is because we configure it a slash 32 mosque. 59 00:05:25,270 --> 00:05:28,670 However here we configure configured to slash 24 mosque. 60 00:05:28,690 --> 00:05:39,590 So we see tenders one but 1.0 So as another example interface loop back to IP Address 10 dot one and 61 00:05:39,590 --> 00:05:43,900 let's make this 10 one slice 24. 62 00:05:44,300 --> 00:05:52,430 What does that add to our writing table do show IP route notice slash 24 network is added to the writing 63 00:05:52,430 --> 00:05:57,420 table because we used a slash 24 mosque on the site. 64 00:05:57,420 --> 00:06:00,890 The address if you need to face is shut down. 65 00:06:02,900 --> 00:06:05,210 The rod is removed from the writing table. 66 00:06:05,210 --> 00:06:07,430 So this route is currently in the writing table. 67 00:06:07,460 --> 00:06:16,570 I'll shut it down to show IP route notice the network is removed because the interface has gone down. 68 00:06:16,600 --> 00:06:24,000 No shut it interface comes up do you show IP route network is now available. 69 00:06:24,250 --> 00:06:32,520 However at the moment we do not have rats in the writing table for Rodda two and three. 70 00:06:32,730 --> 00:06:35,460 So lets add those ranched to the writing table. 7636

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