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  • Casual Articles - Cisco CCNP BCMSN 642-812 Certification Exam Tutorial - DHCP Snooping

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    the address to which the host should set its default gateway. What if a DHCP server that does not belong on our netwo
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    An important part of passing the Cisco CCNP BCMSN exam and protecting your network from intruders is to recognize that even everyday protocols and services can work against us once that intruder is in our network.

    It may be hard to believe, but something as innocent as DHCP can actually lead to trouble for your network. When a host sends out a DHCPDiscovery packet, it listens for DHCPOffer packets - and accepts the first Offer it gets!

    Part of that DHCPOffer is the address to which the host should set its default gateway. What if a DHCP server that does not belong on our networ

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    even everyday protocols and services can work against us once that intruder is in our network.

    It may be hard to believe, but something as innocent as DHCP can actually lead to trouble for your network. When a host sends out a DHCPDiscovery packet, it listens for DHCPOffer packets - and accepts the first Offer it gets!

    Part of that DHCPOffer is the address to which the host should set its default gateway. What if a DHCP server that does not belong on our netwo

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    elieve, but something as innocent as DHCP can actually lead to trouble for your network. When a host sends out a DHCPDiscovery packet, it listens for DHCPOffer packets - and accepts the first Offer it gets!

    Part of that DHCPOffer is the address to which the host should set its default gateway. What if a DHCP server that does not belong on our netwo

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    iscovery packet, it listens for DHCPOffer packets - and accepts the first Offer it gets!

    Part of that DHCPOffer is the address to which the host should set its default gateway. What if a DHCP server that does not belong on our netwo

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    the address to which the host should set its default gateway. What if a DHCP server that does not belong on our network - a rogue DHCP server - is placed on that subnet? If that host uses the DHCPOffer from the rogue server, the host could end up using the rogue server as its default gateway or DNS server!

    We can prevent this with DHCP Snooping. DHCP Snooping classifies interfaces as either trusted or untrusted.

    DHCP messages received on trusted interfaces will be permitted to pass through the switch, but DHCP messages received on untrusted interface result in the interface

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