DHCP snooping is a series of layer 2 techniques that ensures IP integrity on a Layer 2 switched domain. It works with information from a DHCP server to:
- Track the physical location of hosts.
- Ensure that hosts only use the IP addresses assigned to them.
- Ensure that only authorized DHCP servers are accessible.
With DHCP snooping, only a whitelist of IP addresses may access the network. The whitelist is configured at the switch port level, and the DHCP server manages the access control. Only specific IP addresses with specific MAC addresses on specific ports may access the IP network.
DHCP snooping can also prevent attackers from adding their own DHCP servers to the network. An attacker-controlled DHCP server could cause malfunction of the network or even control it.
DHCP snooping is an important component in the defense against ARP spoofing. ARP security checks the IP address in the Source Protocol Address field of ARP packets. If that IP address is not an address that DHCP snooping has recorded as being in use by a host connected to the ingress port of the ARP, then the ARP packet is dropped.
Read more about this topic: DHCP Snooping
Other articles related to "description":
... Unlike the keywords attribute, the description attribute is supported by most major search engines, like Yahoo! and Bing, while Google will fall back on this tag when information about the page itself is ... The description attribute provides a concise explanation of a Web page's content ... This allows the Web page authors to give a more meaningful description for listings than might be displayed if the search engine was unable to ...
... Universal Description, Discovery and Integration (UDDI, pronounced Yu-diː) is a platform-independent, Extensible Markup Language (XML)-based registry by which businesses worldwide can list themselves on ... to be interrogated by SOAP messages and to provide access to Web Services Description Language (WSDL) documents describing the protocol bindings and message formats required to interact with ...
... using descriptive language, and organizing the description are the rhetorical choices to be considered when using a description ... A description is usually arranged spatially but can also be chronological or emphatic ... The focus of a description is the scene ...
... He gives a vivid and accurate description of the last colony of the European Beaver in Wales on the River Teifi, but spoils it by repeating the legend that beavers castrate themselves to avoid danger ... Likewise he gives a good description of an Osprey fishing, but adds the mythical detail that the bird has one webbed foot ... His description of Irish wildlife was harshly called "worthless" the better view perhaps is that despite its faults it gives a valuable glimpse of Irish fauna in the 1180s ...
Famous quotes containing the word description:
“God damnit, why must all those journalists be such sticklers for detail? Why, theyd hold you to an accurate description of the first time you ever made love, expecting you to remember the color of the room and the shape of the windows.”
—Lyndon Baines Johnson (19081973)
“It is possibleindeed possible even according to the old conception of logicto give in advance a description of all true logical propositions. Hence there can never be surprises in logic.”
—Ludwig Wittgenstein (18891951)
“The next Augustan age will dawn on the other side of the Atlantic. There will, perhaps, be a Thucydides at Boston, a Xenophon at New York, and, in time, a Virgil at Mexico, and a Newton at Peru. At last, some curious traveller from Lima will visit England and give a description of the ruins of St Pauls, like the editions of Balbec and Palmyra.”
—Horace Walpole (17171797)