Structure of an Ethernet TCP/IP Frame in Software

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Structure of an Ethernet TCP/IP Frame
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An Ethernet TCP/IP frame consists of the elements illustrated and defined as follows:
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Frame Element
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Purpose
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Preamble field
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An 8-octet field that is used to allow the physical layer circuitry to reach its steady state synchronization within the received frame timing Contains the Source and Destination addresses These addresses can be individual addresses, group addresses, or broadcast addresses A 2-octet field whose value indicates the number of LLC (Logical Link Control) data octets in the data field
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Address fields
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Length field
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IP TCP Data Frame check sequence (FCS)
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See the following section, "IP Header" See the upcoming section "TCP Header" Contains the data being transferred Provides error checking on received frames
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IP Header
When an IP packet passes through the network layer, a header is attached The fields in an IP header are illustrated and defined as follows:
Header Field
Field Contents
Ver IHL Type of Service Total Length Identifier Flags Fragment Offset Time to Live Protocol Header Checksum Source Address Destination Address Options+ and Padding
Version number Internet header length Specifies any precedence, delay, throughput, and/or reliability parameters Total length of the IP datagram Unique number to identify this datagram Indicates if fragmentation is permitted/used Indicates where each fragmented piece fits Time to live in gateway (hops or seconds) Identifies the protocol that follows IP (TCP or UDP) Validation number that each gateway may or may not compute IP address of source IP address of destination Ensures header is correct bit size
TCP Header
Once the IP packet passes through the network layer, it then goes through the transport layer The transport layer, too, attaches a header to the IP packet The fields in a TCP header are illustrated and defined as follows:
Header Field
Field Contents
Source Port Destination Port Sequence Number Acknowledgement Number Data Offset Reserved Flags
Port number of the source Port number of the destination port Number to ensure the correct order Attached to the acknowledgment data Number of 32-bit words in the TCP header Set to zero Control functions, such as the setup and termination of a session, expedited or urgent data flow, reset of a connection, or indication of the end of the data Number of octets (beginning with 1 in the acknowledgment field) the sender is willing to accept Points to the first octet that follows the urgent data and allows the receiver to determine how much urgent data is coming Ensures header is correct bit size
Window Checksum
Options and Padding
Appendix C: The Road to Certification
Overview
The idea of using certification as a way to validate an individual's proficiency level is not a new one Your driver's license proves you have been tested and pronounced able to drive a car on the public roads A teacher must be certified in a particular state in order to teach there The IT industry may someday settle on indeed, is striving to create a set of standards But for now, we must rely on vendor-specific certification standards There are various reasons to become certified, but for most of us it's a way to distinguish ourselves among peers and affirm to employers that we are knowledgeable in our field and proficient in our skills In turn, we expect better positions and increased pay The shortage of skilled IT professionals in the marketplace has created an immense vacuum in the IT workforce Employers who can normally pick and choose from among the most qualified candidates available are increasingly looking for evidence of qualification outside of formal education and even without substantial accompanying experience Certification enables many candidates to qualify and obtain the positions available in this growing field Microsoft and Cisco Systems, in need of a wider labor force to support their increasingly complex systems, have designed certification models to assist IT managers in hiring qualified personnel In turn, waves of professionals are entering the workforce with expertise in Microsoft and Cisco products and services There is quite a difference in the way these two corporate giants present and promote their respective certification processes First, we'll take a look at the simpler of the two systems: Microsoft's Then we'll examine Cisco's wide range of certification possibilities
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