bgp mpls vpn!

bgp mpls vpn

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1) "Bgp" -- As to bgp mpls vpn The five layer TCP/IP model 5. Application layer DHCP • DNS • FTP • HTTP • IMAP4 • IRC • NNTP • XMPP • MIME • POP3 • SIP • SMTP • SNMP • SSH • TELNET • BGP • RPC • RTP • RTCP • TLS/SSL • SDP • SOAP • L2TP • PPTP • … 4. Transport layer TCP • UDP • DCCP • SCTP • GTP • … 3. Network layer IP (IPv4 • IPv6) • ARP • RARP • ICMP • IGMP • RSVP • IPSec • … 2. Data link layer ATM • DTM • Ethernet • FDDI • Frame Relay • GPRS • PPP • … 1. Physical layer Ethernet physical layer • ISDN • Modems • PLC • RS232 • SONET/SDH • G.709 • Wi-Fi • … The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. It works by maintaining a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional IGP metrics, but makes routing decisions based on path, network policies and/or rulesets. From January 2006, the current version of BGP, version 4, is codified in RFC 4271. BGP supports Classless Inter-Domain Routing and uses route aggregation to decrease the size of routing tables. Since 1994, version four of the protocol has been in use on the Internet. All previous versions are now obsolete. BGP was created to replace the EGP routing protocol to allow fully decentralized routing in order to allow the removal of the NSFNet Internet backbone network. This allowed the Internet to become a truly decentralized..." 2) "Mpls" -- As to bgp mpls vpn The five layer TCP/IP model 5. Application layer DHCP • DNS • FTP • HTTP • IMAP4 • IRC • NNTP • XMPP • MIME • POP3 • SIP • SMTP • SNMP • SSH • TELNET • BGP • RPC • RTP • RTCP • TLS/SSL • SDP • SOAP • L2TP • PPTP • … 4. Transport layer TCP • UDP • DCCP • SCTP • GTP • … 3. Network layer IP (IPv4 • IPv6) • ARP • RARP • ICMP • IGMP • RSVP • IPSec • … 2. Data link layer ATM • DTM • Ethernet • FDDI • Frame Relay • GPRS • PPP • … 1. Physical layer Ethernet physical layer • ISDN • Modems • PLC • RS232 • SONET/SDH • G.709 • Wi-Fi • … In computer networking and telecommunications, MultiProtocol Label Switching (MPLS) is a data-carrying mechanism which emulates some properties of a circuit-switched network over a packet-switched network. MPLS operates at an OSI Model layer that is generally considered to lie between traditional definitions of Layer 2 (data link layer) and Layer 3 (network layer), and thus is often referred to as a "Layer 2.5" protocol. It was designed to provide a unified data-carrying service for both circuit-based clients and packet-switching clients which provide a datagram service model. It can be used to carry many different kinds of traffic, including IP packets, as well as native ATM, SONET, and Ethernet frames. This is a basic introduction. To obtain more detail on MPLS see External Links. 1 Background 2 How..." 3) "Vpn" -- As to bgp mpls vpn A virtual private network (VPN) is a private communications network often used by companies or organizations, to communicate confidentially over a public network. VPN traffic can be carried over a public networking infrastructure (e.g. the Internet) on top of standard protocols, or over a service provider's private network with a defined Service Level Agreement (SLA) between the VPN customer and the VPN service provider. A VPN can send data e.g. voice, data or video, or a combination of these media, across secured and encrypted private channels between two points. 1 Authentication mechanism 2 Types of VPN 3 Characteristics in application 4 Tunneling 5 VPN security dialogs 6 See also 7 External links Virtual private networks can be a cost-effective and secure way for different corporations to provide users access to the corporate network and for remote networks to communicate with each other across the Internet. VPN connections are more cost-effective than dedicated private lines; usually a VPN involves two parts: the protected or "inside" network, which provides physical and administrative security to protect the transmission; and a less trustworthy, "outside" network or segment (usually through the Internet). Generally, a firewall sits between a remote user's workstation or client and the host network or server. As the user's client establishes the communication with the firewall, the client may pass authentication data to an authentication service inside the perimeter. A known trusted person, sometimes only when using trusted devices, can be provided with appropriate security privileges to access resources not available to general users. Many VPN client programs can be configured to require that all IP traffic must pass through the tunnel while the VPN connection is active, for increased security. From the user's perspective, this means that while ..." 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