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In computer networking, unicast is a one-to-one transmission from one point in the network to another point; that is, one sender and one receiver, each identified by a network address. [ 1 ] Unicast is in contrast to multicast and broadcast which are one-to-many transmissions.
The routing algorithm selects the single receiver from the group based on which is the nearest according to some distance or cost measure. Unicast is the dominant form of message delivery on the Internet. This article focuses on unicast routing algorithms.
In the case of unknown-unicast traffic, a security issue may arise. To prevent flooding unknown-unicast traffic across the switch, it is possible to configure the network equipment to divert unknown-unicast traffic to specific trunk interfaces in order to split broadcast coming from different VLANs or to use specific trunk interfaces for ...
Reverse-path forwarding (RPF) is a technique used in modern routers for the purposes of ensuring loop-free forwarding of multicast packets in multicast routing and to help prevent IP address spoofing in unicast routing. [1] In standard unicast IP routing, the router forwards the packet away from the source to make progress along the ...
Routing tables are also a key aspect of certain security operations, such as unicast reverse path forwarding (uRPF). [2] In this technique, which has several variants, the router also looks up, in the routing table, the source address of the packet.
IPv6 addresses are classified by the primary addressing and routing methodologies common in networking: unicast addressing, anycast addressing, and multicast addressing. [1] A unicast address identifies a single network interface. The Internet Protocol delivers packets sent to a unicast address to that specific interface.
Unicast, multicast, and broadcast are supported and all routing is on symmetric shortest paths. The control plane is based on the Intermediate System to Intermediate System (IS-IS) routing protocol, leveraging a small number of extensions defined in RFC 6329. [9]
In an effort to avoid unnecessary load on hosts that do not participate in routing, RIPv2 multicasts the entire routing table to all adjacent routers at the address 224.0.0.9, as opposed to RIPv1 which uses broadcast. Unicast addressing is still allowed for special applications. authentication for RIP was introduced in 1997. [10] [11]