P Router

The five-layer TCP/IP model
5. Application layer
DHCP · DNS · FTP · Gopher · HTTP · IMAP4 · IRC · NNTP · XMPP · POP3 · RTP · SIP · SMTP · SNMP · SSH · TELNET · RPC · RTCP · RTSP · TLS (and SSL) · SDP · SOAP · GTP · STUN · NTP · BGP · (more)
4. Transport layer
TCP · UDP · DCCP · SCTP · RSVP · ECN · (more)
3. Network/internet layer
IP (IPv4 · IPv6) · OSPF · IS-IS · IPsec · ARP · RARP · RIP · ICMP · ICMPv6 · IGMP · (more)
2. Data link layer
802.11 (WLAN) · 802.16 · Wi-Fi · WiMAX · ATM · DTM · Token ring · Ethernet · FDDI · Frame Relay · GPRS · EVDO · HSPA · HDLC · PPP · PPTP · L2TP · ISDN · ARCnet · LLTD · (more)
1. Physical layer
Ethernet physical layer · RS-232 · SONET/SDH · G.709 · Optical fiber · Coaxial cable · Twisted pair · (more)
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In Multi-Protocol Label Switching (MPLS), a P Router or Provider Router is a Label Switch Router (LSR) that functions as a transit router of the core network. The P Router typically connected to one or more PE Routers.

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