Netgear XCM8806 Chassis User Manual - Page 943

NETGEAR 8800 User Manual T (Continued) TCP TFTP Transmission Control Protocol. Together with Internet Protocol (IP), TCP is one of the core protocols underlying the Internet. The two protocols are usually referred to as a group, by the term TCP/IP. TCP provides a reliable connection, which means that each end of the session is guaranteed to receive all of the data transmitted by the other end of the connection, in the same order that it was originally transmitted without receiving duplicates. Trivial File Transfer Protocol. TFTP is an Internet utility used to transfer files, which does not provide security or directory listing. It relies on UDP. U UDP User Datagram Protocol. This is an efficient but unreliable, connectionless protocol that is layered over IP (as is TCP). Application programs must supplement the protocol to provide error processing and retransmitting data. UDP is an OSI Layer 4 protocol. unicast A unicast packet is communication between a single sender and a single receiver over a network. untagged VLAN USM A VLAN remains untagged unless you specifically configure the IEEE 802.1Q value on the packet. A port cannot belong to more than one untagged VLAN using the same protocol. User-based security model. In SNMPv3, USM uses the traditional SNMP concept of user names to associate with security levels to support secure network management. V virtual link virtual router In OSPF, when a new area is introduced that does not have a direct physical attachment to the backbone, a virtual link is used. Virtual links are also used to repair a discontiguous backbone area. In the NETGEAR implementations, virtual routers allow a single physical switch to be split into multiple virtual routers. Each virtual router has its own IP address and maintains a separate logical forwarding table. Each virtual router also serves as a configuration domain. The identity of the virtual router you are working in currently displays in the prompt line of the CLI. The virtual routers discussed in relation to NETGEAR switches themselves are not the same as the virtual router in VRRP. In VRRP, the virtual router is identified by a virtual router (VRID) and an IP address. A router running VRRP can participate in one or more virtual routers. The VRRP virtual router spans more than one physical router, which allows multiple routers to provide redundant services to users. virtual router MAC address In VRRP, RFC 2338 assigns a static MAC address for the first five octets of the VRRP virtual router. These octets are set to 00-00-5E-00-01. When you configure the VRRP VRID, the last octet of the MAC address is dynamically assigned the VRID number. Appendix E. Glossary | 943