Information Technology Reference
In-Depth Information
Foundation Summary
The Foundation Summary is a condensed collection of material that provides a convenient
review of key concepts in this chapter. If you are already comfortable with the topics in this
chapter, this summary will help you recall a few details. If you just read the Foundation Topics
section, this review should help solidify some key facts. If you are doing your final preparation
before the exam, these materials are a convenient way to review the day before the exam.
Ethernet Frame Formats
Table 4-13
Frame
Description
Ethernet V2
Uses 2-byte Type field.
IEEE 802.3
Uses 2-byte Length field and 3-byte LLC.
IEEE 802.3 SNAP
Uses 2-byte length field, 3-byte LLC, and 5-byte SNAP; the SNAP values are
0xAA.
Novell Raw
Uses 2-byte length field; data begins with 0xFFFF.
Media Specifications
The specifications for Thicknet (10Base5) are as follows:
•
0.4 inch, 50 ohm coax cable.
•
Maximum segment length is 500 m.
•
Maximum number of attachments per segment is 100.
•
Maximum AUI cable length is 50 m.
•
Minimum separation between attachments (MAU) is 2.5 m.
•
Cable ends terminate with 50 ohm terminators.
•
MAU attach workstations.
•
Maximum network length is 5 segments and 2500 m.
•
Maximum number of stations on the network is 1024.
The media specifications for 10Base2 are as follows:
•
0.2 inch, RG58-U, 50 ohm coax cable.
•
Maximum segment length is 185 m.
•
Maximum number of attachments per segment is 30.
•
Minimum separation per segment is 0.5 m.
•
T-connectors attach workstations.
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