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tcpip osi komunikasi data data communication mpls voip hub physical switch layer cdma evdo ev-do sip router ip pbx ip address protocol vpn virtual private network dns network layer laye mac address application layer telnet dhcp http ip network internet isp ip telephony pbx komunikawsi data udp physical layer data data link ethernet elemen jaringan topology bus icmp arp routing layer tcp network transport martini vc-id layer-2 vpn virtual switching instance route target vrf provider edge ce eompls mpls-te traffic engineering cscf rsvp fast reroute vpvv4 cd cdma 2000 radio interface cdma evdo packet data voice over ip voice qos codec vad decoder g278 coder user agent session initiation protocol sip protocol spa9000 dial plan multi protocol label switching layer-3 vpn mp-bgp route distinguisher vpnv4 vpws vpls call flow