1 00:00:00,940 --> 00:00:02,200 Here's another router. 2 00:00:02,390 --> 00:00:09,730 And on this third Rodda using the come on show up shows us the OP table. 3 00:00:10,340 --> 00:00:17,020 I could ping another router in the network as follows. 4 00:00:17,040 --> 00:00:24,020 Now when I use the C'mon show up there's the resolution between IP version 4 address and MAC address 5 00:00:24,530 --> 00:00:30,130 of the remote's router show IP route shows us the writing table. 6 00:00:30,440 --> 00:00:39,970 And as you can see this router has a default gateway or gateway of last resort of 1 9 2 1 6 8 1 2:49. 7 00:00:40,000 --> 00:00:42,350 So there's the static default gateway. 8 00:00:42,730 --> 00:00:51,510 So this Rodda as an example we'll be able to ping through Google dot com after doing a DNS request to 9 00:00:51,540 --> 00:01:00,080 the DNS server so that IP address wasn't previously in the OP cache over here. 10 00:01:00,570 --> 00:01:09,120 But show up now shows us the resolution between IP version for address and MAC address of the local 11 00:01:09,120 --> 00:01:10,470 DNS server. 12 00:01:10,710 --> 00:01:18,390 The Rotto was able to ping Google dot com because it sent traffic to Google via its default gateway 13 00:01:18,770 --> 00:01:20,630 or gateway of last resort. 14 00:01:20,790 --> 00:01:23,730 1 9 2 1 6 8 1 2 4 9. 15 00:01:23,850 --> 00:01:29,320 So the router has both in cash as well as a routing table. 16 00:01:29,420 --> 00:01:37,310 We can see details of interfaces on the Shradha by using the command show IP interface brief and we 17 00:01:37,310 --> 00:01:41,170 can see more detail by looking at an individual interface. 18 00:01:41,200 --> 00:01:47,500 So this first Ethan interface is configured with this hardware MAC address which is the same as the 19 00:01:47,560 --> 00:01:55,210 burnt in MAC address set by Cisco on the scene to face the speed and Duplaix of the interfaces 100 megabits 20 00:01:55,210 --> 00:02:03,340 per second and it's using full duplex ARP entries with time out after 4 hours by default on the router. 21 00:02:03,340 --> 00:02:09,610 Notice we can see the input queue for the interface as well as the output queue. 22 00:02:09,690 --> 00:02:17,640 So packets may need to be buffered as an example on a gross out of the first Ethan interface. 23 00:02:17,640 --> 00:02:25,530 If there's high congestion we can see the packets in and packets output on this interface but interfaces 24 00:02:25,530 --> 00:02:31,920 on routers have buffers if packets need to be buffered before they sent or buffered when they received 25 00:02:32,280 --> 00:02:35,730 and before they can be processed by the central CPQ of the router. 26 00:02:37,080 --> 00:02:38,760 Show version on this router 27 00:02:41,480 --> 00:02:48,340 will show us that the memory on the shroud is a lot lower than the other routers. 28 00:02:48,500 --> 00:02:54,720 1 1 5 7 1 2 plus 1 5 3 6 29 00:02:57,720 --> 00:03:07,020 divided by 1024 shows us that those Shradha only has 128 mega ram whereas the other routers had 256 30 00:03:07,080 --> 00:03:13,400 meg of ram show flash shows us the files stored in flash on the router. 31 00:03:13,740 --> 00:03:23,960 Notice they are two versions of the operating system on the router and commands such as the boot command 32 00:03:25,110 --> 00:03:31,310 allow us to specify which operating system is going to be booted or loaded by the router. 33 00:03:31,620 --> 00:03:35,350 By default the first operating system in Flash is loaded. 34 00:03:35,550 --> 00:03:43,410 But in this case the boot to system flash command specifies that this operating system instead of this 35 00:03:43,410 --> 00:03:46,760 operating system should be loaded by the router. 36 00:03:47,040 --> 00:03:53,400 Now in this case they the same notice the name is slightly different underscore too but you could have 37 00:03:53,400 --> 00:03:59,970 different operating systems in Flash or different versions of an operating system and then decide which 38 00:03:59,970 --> 00:04:01,820 one gets booted. 39 00:04:01,830 --> 00:04:06,870 So if you upgrading the router you may load an additional operating system into flash and then tell 40 00:04:06,870 --> 00:04:12,360 the router to boot off fat but if it fails then boot off an alternate operating system.