Get CCNA INTRO Exam Certification Guide (CCNA Self-Study, PDF

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Extra resources for CCNA INTRO Exam Certification Guide (CCNA Self-Study, 640-821, 640-801)

Example text

Com/title/9781587201967 when appropriate to provide you with the most up-todate material. Also included in Part X is a decimal to binary conversion chart for reference in Appendix B. There are also several useful appendixes that can only be accessed from the CD in the back of the book. Following is a description of each part’s coverage: ■ Part I, “LAN Switching” (Chapters 1–3) This part focuses on LAN Layer 2 features, specifically Ethernet (Chapter 1), VLANs and trunking (Chapter 2), and Spanning Tree Protocol (Chapter 3).

The I/G bit signifies whether the address represents an individual device or a group of devices, and the U/L bit identifies locally configured addresses. For instance, the Ethernet multicast addresses used by IP multicast implementations always start with 0x01005E. Hex 01 (the first byte of the address) converts to binary 00000001, with the most significant bit being 1, confirming the use of the I/G bit. NOTE Often, when overriding the MAC address to use a local address, the device or device driver does not enforce the setting of the U/L bit to a value of 1.

Table 1-2 summarizes how the cabling and pinouts work. Table 1-2 Ethernet Cabling Types Type of Cable Pinouts Key Pins Connected Straight-through T568A (both ends) or T568B (both ends) 1 – 1; 2 – 2; 3 – 3; 6 – 6 Cross-over T568A on one end, T568B on the other 1 – 3; 2 – 6; 3 – 1; 6 – 2 Ethernet Layer 1: Wiring, Speed, and Duplex 9 Many Ethernet standards use two twisted pairs, with one pair being used for transmission in each direction. For instance, a PC network interface card (NIC) transmits on pair 1,2 and receives on pair 3,6; switch ports do the opposite.

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