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You are here: Home / SWITCH / Module 6 / LAN Security – DHCP Snooping and IP Source Guard

LAN Security – DHCP Snooping and IP Source Guard

DHCP spoofing and starvation attacks are methods used by intruders to exhaust the DHCP address pool on the DHCP sever, resulting in resource starvation where there are no DHCP addresses available to be assigned to legitimate users.

DHCP is used to dynamically assign hosts with IP addresses. A DHCP server can be configured to provide DHCP clients with a great deal of information, such as DNS servers, NTP servers, WINS information, and default gateway (router) information. DHCP uses UDP port 68. Cisco IOS routers and some switches can be configured as both DHCP clients and DHCP servers.

When using DHCP . . .

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