tailieunhanh - Lecture Network Certification: Chapter 6 - Microsoft Press

Chapter 6 - Network layer protocols. Chapter summary: Network layer protocols are responsible for end-to-end communications across the network; IP is a connectionless protocol that encapsulates transport layer data into datagrams; IPX is a proprietary standard that performs routing, addressing, and protocol identification; NetBIOS Extended User Interface (NetBEUI) is used by small Windows networks for LAN networking; AppleTalk provides basic networking to small networks. | Chapter Overview IP IPX NetBEUI AppleTalk Network Layer Protocols Responsible for end-to-end communications on an internetwork Contrast with data-link layer protocols, which provide communications on the same local area network (LAN) IP Encapsulation IP Functions Encapsulation Addressing Routing Fragmentation Protocol identification The IP Datagram Format IP Addresses Internet Protocol (IP) is the only network layer protocol with its own addressing system. IP addresses are 32 bits long. IP addresses have two parts: a network identifier and a host identifier. IP addresses are assigned to network interface adapters, not to computers. The Source IP Address field in the IP header always identifies the computer that generated the packet. The Destination IP Address field in the IP header always identifies the packet’s final destination. End Systems and Intermediate Systems Fragmentation Routers connect networks that support different-sized packets. The largest . | Chapter Overview IP IPX NetBEUI AppleTalk Network Layer Protocols Responsible for end-to-end communications on an internetwork Contrast with data-link layer protocols, which provide communications on the same local area network (LAN) IP Encapsulation IP Functions Encapsulation Addressing Routing Fragmentation Protocol identification The IP Datagram Format IP Addresses Internet Protocol (IP) is the only network layer protocol with its own addressing system. IP addresses are 32 bits long. IP addresses have two parts: a network identifier and a host identifier. IP addresses are assigned to network interface adapters, not to computers. The Source IP Address field in the IP header always identifies the computer that generated the packet. The Destination IP Address field in the IP header always identifies the packet’s final destination. End Systems and Intermediate Systems Fragmentation Routers connect networks that support different-sized packets. The largest packet size supported by a network is called its maximum transmission unit (MTU). When a packet is too large to be forwarded to a particular network, the router splits it into fragments. Each fragment is encapsulated with a header and is transmitted as a separate packet. Fragments are not reassembled until they reach their final destination. Fragments can themselves be fragmented. Fragmentation (Cont.) Protocol Field Values 0 IP 1 ICMP 3 Gateway-to-Gateway Protocol (GGP) 6 TCP 8 Exterior Gateway Protocol (EGP) 17 UDP The IPX Standard Developed by Novell for use with NetWare Proprietary; never published as a public standard Reverse engineered by Microsoft to create NWLink IPX Functions Routing Addressing Protocol identification The IPX Header Format IPX Addressing Internet Packet Exchange (IPX) uses Separate node and network addresses Network interface adapter hardware addresses for node addresses Network addresses Are assigned by administrators Do not need to be .

• Quản trị mạng
• Lecture Network+
• Networking basics
• The OSI Model
• Internet protocol
• Network layer protocols
• IP functions
• Network Layer and Mobile IP
• Network Layer in Internet
• Network Layer functions
• ID addressing
• ID datagram format
• Routing Algorithm classification
• Sybex Firewalls 24Seven
• Sybex Firewalls 24Seven second edition
• The inner workings of TCP IP
• Firewall technology
• The basic functions of firewalls