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This is a free, complete course for the CCNA.
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If you like these videos, please subscribe\n
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Also, please like and leave a comment, and\n
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If you want more labs like this, I highly\n
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NetSim is a network simulator like Packet\n
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over 100 detailed guided labs covering the\nCCNA exam topics.
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If you want to get NetSim, follow the link\nin the description.
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In this video we’ll configure DHCP snooping\non SW1 and SW2.
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This is the same topology as in the lecture\n
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Let’s get right into it by configuring R1\n
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CONF T. Let’s exclude 192.168.1.1 to 192.168.1.9\nfrom the pool.
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Remember, this part of the configuration is\n
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IP DHCP EXCLUDED-ADDRESS 192.168.1.1 192.168.1.9.
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Okay, now I’ll configure the pool.
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I’ll configure the 192.168.1.0/24 subnet.
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NETWORK 192.168.1.0 255.255.255.0.
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And then configure R1 as the default gateway.
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Okay, that’s all the configuration needed\non R1.
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Next let’s configure DHCP snooping on SW1\nand SW2.
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CONF T. First, enable DHCP snooping globally.
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But, that isn’t enough to actually enable\nDHCP snooping.
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We need to tell SW1 which VLANs to enable\nit for.
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Only VLAN 1 is being used in this network,\n
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However, all interfaces are untrusted, so\n
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Let’s configure G0/2, connected to R1, as\na trusted port.
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Okay, that’s all for SW1 for now.
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There’s one command I left out, but we’ll\ncome back to it later.
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Now I’ll do the exact same configurations\non SW2.
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G0/1 is the uplink leading toward R1, so INTERFACE\nG0/1.
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Okay, now let’s try to get an IP address\non PC1.
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To do that I’ll use the command IPCONFIG\n/RENEW.
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The correct interfaces are configured as trusted,\n
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Well, let’s check by switching to simulation\nmode.
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And then do IPCONFIG /RENEW again.
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The DHCP message goes to SW2 and then SW1,\n
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Let’s check this message here, as it was\nreceived by SW1.
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Down at the bottom of the Inbound PDU details,\n
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SW2 added this option to PC1’s message.
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SW1 received it on an untrusted port, so it\ndiscarded it.
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Let’s go back to realtime mode now, and\nfix that.
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On SW1 first, I’ll configure NO IP DHCP\n
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By the way, you can see the syslog messages\n
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Notice it says option82 value on untrusted\n
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And then I’ll configure the same on SW2\nalso.
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NO IP DHCP SNOOPING INFORMATION OPTION.
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I’ve explained why we need to use this command\n
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Just remember that it’s necessary if the\n
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Okay, let’s try that again on PC1.
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Okay, this time it works and PC1 was able\nto get an IP address.
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So, in this lab we configured DHCP snooping.
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It’s fairly simple to configure.
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The only thing that can be tricky is remembering\n
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As you can see, it can cause problems if you\ndon’t.
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Okay, that’s all for this lab.
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Now let’s take a look at a lab in Boson\n
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