tailieunhanh - NETWORK+ GUIDE TO NETWORKS, FOURTH EDITION - CHAPTER 11

In-Depth TCP/IP Networking Understand methods of network design unique to TCP/IP networks, including subnetting, CIDR, NAT and ICS Explain the differences between public and private networks Describe protocols used between mail clients and mail servers, including SMTP, POP3, and IMAP4 Employ multiple TCP/IP utilities for network discovery and troubleshooting | Network+ Guide to Networks, Fourth Edition Chapter 11 In-Depth TCP/IP Networking Objectives Understand methods of network design unique to TCP/IP networks, including subnetting, CIDR, NAT and ICS Explain the differences between public and private networks Describe protocols used between mail clients and mail servers, including SMTP, POP3, and IMAP4 Employ multiple TCP/IP utilities for network discovery and troubleshooting Linux+ Guide to Linux Certification, Second Edition Designing TCP/IP-Based Networks Review of some TCP/IP fundamentals: IP is a routable protocol On a network using TCP/IP, each interface associated with unique IP address Some nodes may use multiple IP addresses IP addresses consist of four 8-bit octets Many networks assign IP addresses and host names dynamically, using DHCP Every IP address can be associated with a network class Linux+ Guide to Linux Certification, Second Edition Subnetting Separates network into multiple, logically defined segments . | Network+ Guide to Networks, Fourth Edition Chapter 11 In-Depth TCP/IP Networking Objectives Understand methods of network design unique to TCP/IP networks, including subnetting, CIDR, NAT and ICS Explain the differences between public and private networks Describe protocols used between mail clients and mail servers, including SMTP, POP3, and IMAP4 Employ multiple TCP/IP utilities for network discovery and troubleshooting Linux+ Guide to Linux Certification, Second Edition Designing TCP/IP-Based Networks Review of some TCP/IP fundamentals: IP is a routable protocol On a network using TCP/IP, each interface associated with unique IP address Some nodes may use multiple IP addresses IP addresses consist of four 8-bit octets Many networks assign IP addresses and host names dynamically, using DHCP Every IP address can be associated with a network class Linux+ Guide to Linux Certification, Second Edition Subnetting Separates network into multiple, logically defined segments (subnets) Each subnet’s traffic separated from every other subnet’s traffic Enhances security Subnetworks must be connected via routers or other Layer 3 devices Improves performance Data is selectively retransmitted Simplifies troubleshooting Linux+ Guide to Linux Certification, Second Edition Classful Addressing Adheres to network class distinctions Only Class A, B, and C addresses are recognized Network ID limited to first 8 bits in Class A, first 16 bits in Class B, and first 24 bits in Class C Fixed network ID size ultimately limits number of hosts a network can include Linux+ Guide to Linux Certification, Second Edition Classful Addressing (continued) Figure 11-1: Example IP addresses with classful addressing Linux+ Guide to Linux Certification, Second Edition Subnet Masks Subnetting depends on subnet masks to identify how a network is subdivided Indicates where network information is located in an IP address “1” bits indicate corresponding bits in IP address contain network