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to RARP requests exists on the network, it will respond to the querying station with an assigned IP address RARP has been superseded by BOOTP (Bootstrap Protocol) and later by DHCP (Dynamic Host Configuration Protocol) OSPF (Open Shortest Path First) This is a routing protocol that is implemented in the TCP/IP link layer The purpose and function of routing protocols are discussed in detail later in this section L2TP (Layer 2 Tunneling Protocol) This is a tunneling protocol that is implemented in the link layer The purpose and function of tunneling protocols are discussed later in this section PPP (Point-to-Point Protocol) This packet-oriented protocol is used mainly over point-to-point physical connections such as RS-232 or HSSI (High-Speed Serial Interface) between computers Media Access Control (MAC) This framing protocol is the underlying protocol used by various media such as Ethernet, DSL, MPLS, and ISDN
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Internet layer protocols are the fundamental building blocks of TCP/IP The Internet layer is really the bottom layer where a frame or packet is uniquely TCP/IP Protocols in the TCP/IP Internet layer include: IP ICMP IGMP IPsec IP Protocol IP is the principal protocol used by TCP/IP at the Internet layer The main transport layer protocols (discussed in the next section), TCP and UDP, are built on the IP protocol The purpose of the IP protocol is to transport messages over internetworked networks IP is the workhorse of the TCP/IP protocol suite: Most communications that take place on the Internet are built on it Characteristics of the IP protocol include: IP addressing At the IP layer, nodes on networks have unique addresses IP addressing is discussed in detail later in this section Best-effort delivery IP does not guarantee that a packet will reach its intended destination Connectionless Each packet is individual and not related to any other Out-of-order packet delivery No assurances for order of delivery are addressed by IP Packets may arrive out of order at their destination
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Higher-layer protocols such as TCP address reliability, connections, and order of delivery ICMP Protocol ICMP is used by systems for diagnostic purposes Primarily, ICMP messages are automatically issued whenever there are problems with IP communications between two stations For example, one station attempts to send a message to another station, and a router on the network knows that there is no existing route to the destination station In this case, the router will send an ICMP Type 3, Code 1 No route to host diagnostic packet back to the sending station to inform it that the destination station is not reachable ICMP message types are shown in Table 5-5
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19-29 30 31-255 Table 5-5
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Echo reply (reserved) (reserved) Destination unreachable (contains 14 subcodes that describes in detail) Source quench Redirect message (with 4 subcodes) Alternate host address (reserved) Echo request Router advertisement Router solicitation Time exceeded (with 2 subcodes) Parameter problem: bad IP header (with 3 subcodes) Timestamp Timestamp reply Information request Information reply Address mask request Address mask reply (reserved) Traceroute (seldom used or reserved for future use) ICMP Message Types
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The well-known ping command uses the ICMP 8 Echo Request packet type If the target station is reachable, it will respond with ICMP 1 Echo Reply packets The ping command is used to determine whether a particular system is reachable from another system over a TCP/IP network IGMP Protocol IGMP is used to manage a type of communications called multicast IPsec Protocol Internet Protocol Security, usually known as IPsec, is a suite of protocols that is used to secure IP-based communication The security that IPsec provides is authentication and encryption IPsec authentication is used to confirm the identity of a station on a network This is used to prevent a rogue system from easily masquerading as another, real system Authentication is achieved through the establishment of a security association (SA) between two nodes, which permits the transmission of data from the originating node to the destination node If the two nodes need to send messages in both directions, two SAs need to be established The Internet Key Exchange (IKE) protocol is used to set up associations IPsec has two primary modes of operation: Transport mode Here, only the payload of an incoming packet is authenticated or encrypted The original IP header is left intact The original headers are protected with hashes; if the headers are altered, the hashes will fail and an error will occur Tunnel mode Here, each entire incoming packet is encapsulated within an IPsec packet The entire incoming packet can be encrypted, which protects the packet against eavesdropping This mode is often used for protecting network traffic that traverses the Internet, thereby creating a VPN between two nodes, between two networks, or between a remote node and a network IPsec tunnel mode is shown in Figure 5-20
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