By Todd Lammle

Here's the publication you must arrange for Cisco's CCNA examination, 640-801. This examine consultant was once built to satisfy the exacting standards of state-of-the-art Cisco certification applicants. as well as the attractive and available educational technique that has earned writer Todd Lammle the ''Best examine consultant Author'' award in CertCities Readers' selection Awards for 2 consecutive years, this up-to-date 5th version presents:

  • In-depth insurance of each CCNA examination goal
  • Expanded IP addressing and subnetting assurance
  • More exact info on EIGRP and OSPF
  • Leading-edge examination coaching software program

Authoritative assurance of all examination pursuits, together with:

  • Network making plans & designing
  • Implementation & operation
  • LAN and WAN troubleshooting
  • Communications know-how

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Read Online or Download CCNA: Cisco Certified Network Associate Study Guide, 5th Edition (640-801) PDF

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CCNA: Cisco Certified Network Associate Study Guide, 5th Edition (640-801)

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Extra info for CCNA: Cisco Certified Network Associate Study Guide, 5th Edition (640-801)

Example text

The receiving node acknowledges it has received them by requesting segment 4. When it receives the acknowledgment, the sender then transmits segments 4, 5, and 6. If segment 5 doesn’t make it to the destination, the receiving node acknowledges that event with a request for the segment to be resent. The sending machine will then resend the lost segment and wait for an acknowledgment, which it must receive in order to move on to the transmission of segment 7. The Network Layer The Network layer (also called layer 3) manages device addressing, tracks the location of devices on the network, and determines the best way to move data, which means that the Network layer must transport traffic between devices that aren’t locally attached.

The Physical Layer Finally arriving at the bottom, we find that the Physical layer does two things: It sends bits and receives bits. Bits come only in values of 1 or 0—a Morse code with numerical values. The Physical layer communicates directly with the various types of actual communication media. Different kinds of media represent these bit values in different ways. Some use audio tones, while others employ state transitions—changes in voltage from high to low and low to high. Specific protocols are needed for each type of media to describe the proper bit patterns to be used, how data is encoded into media signals, and the various qualities of the physical media’s attachment interface.

The next bit is the G/L bit (also known as U/L, where U means universal). When set to 0, this bit represents a globally administered address (as by the IEEE). When the bit is a 1, it represents a locally governed and administered address (as in DECnet). The low-order 24 bits of an Ethernet address represent a locally administered or manufacturer-assigned code. This portion commonly starts with 24 0s for the first card made and continues in order until there are 24 1s for the last (16,777,216th) card made.

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CCNA: Cisco Certified Network Associate Study Guide, 5th by Todd Lammle
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