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DHCP does provide some mechanisms for mitigating these problems. The Relay Agent Information Option protocol extension [31] (usually referred to in the industry by its actual number as Option 82 [36] [37]) allows network operators to attach tags to DHCP messages as these messages arrive on the network operator's trusted network. This tag is ...
RARP has been rendered obsolete by the Bootstrap Protocol (BOOTP) and the modern Dynamic Host Configuration Protocol (DHCP), which both support a much greater feature set than RARP. RARP requires one or more server hosts to maintain a database of mappings of link layer addresses to their respective protocol addresses. MAC addresses need to be ...
Example showing how DHCP snooping works. In computer networking, DHCP snooping is a series of techniques applied to improve the security of a DHCP infrastructure. [1] DHCP servers allocate IP addresses to clients on a LAN. DHCP snooping can be configured on LAN switches to exclude rogue DHCP servers and remove
Cisco Prime Network Registrar (CNR) is a Cisco software product that includes components for Domain Name System (DNS) services, Dynamic Host Configuration Protocol services, Trivial File Transfer Protocol (TFTP) services, and Simple Network Management Protocol functions. CNR provides a regional and local management structure and is supported on ...
Layer 4 UDP 12222 (data channel) and 12223 (control channel) connectivity must be established to work with this form of the protocol. Broadcasts or DHCP option 43 can be used to prime the access-points of the network. The controller must be on the same subnet if DHCP is not configured to handle layer 3 LWAPP provisioning.
Network Admission Control (NAC) refers to Cisco's version of network access control, which restricts access to the network based on identity or security posture.When a network device (switch, router, wireless access point, DHCP server, etc.) is configured for NAC, it can force user or machine authentication prior to granting access to the network.
• Cisco Prime Data Center Network Manager: (DCNM) combines the management of Ethernet and storage networks into a single dashboard to help network and storage administrators troubleshoot health and performance across the entire range of Cisco NX-OS platforms, including the Cisco Nexus and MDS 9000 Families, regardless of protocol type.
A first hop redundancy protocol (FHRP) is a computer networking protocol which is designed to protect the default gateway used on a subnetwork by allowing two or more routers to provide backup for that address; [1] [2] in the event of failure of an active router, the backup router will take over the address, usually within a few seconds.