New PDF release: CCNA INTRO: Introduction to Cisco Networking Technologies

By Todd Lammle

Take your first step to CCNA certification From bestselling writer Todd Lammle comes the main up to date publication on CCNA examination 640-821, the 1st examination in Cisco's renowned two-exam Cisco qualified community affiliate (CCNA) certification song. comprehend networking for the small or domestic workplace industry, organize for the examination, and obtain the talents you wish with this entire advisor. within you will discover: whole assurance of all examination targets in a scientific process, so that you might be convinced you are getting the guideline you wish functional hands-on routines to enhance severe abilities Real-world situations that convey you lifestyles past the school room and placed what you have realized within the context of tangible activity roles not easy overview questions in each one bankruptcy to organize you for examination day examination necessities, a key characteristic on the finish of every bankruptcy that identifies serious parts you need to turn into educated in earlier than taking examination 640-821 A convenient tear card that maps each professional examination goal to the corresponding bankruptcy within the publication, so that you can tune your examination prep goal through goal glance inside of for whole assurance of all examination targets. Featured at the CD SYBEX try out ENGINE: try out your wisdom with complicated checking out software program. comprises all bankruptcy assessment questions and bonus tests. digital FLASHCARDS: toughen your realizing with flashcards that could run in your workstation, Pocket notebook, or Palm hand held. additionally on CD, you will find preview variants of the CCNA Video sequence and the CCNA Audio sequence from writer Todd Lammle, in addition to the whole booklet in searchable and printable PDF. examine wherever, any time, and process the examination with self belief.

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Additional resources for CCNA INTRO: Introduction to Cisco Networking Technologies Study Guide: Exam 640-821

Sample text

B. A hub is a Physical layer device. See Chapter 1 for more information. 16. B. The command show controllers s 0 tells you what type of serial connection you have. If it is a DCE, you need to provide the clock rate. See Chapter 4 for more information. 17. C. The primary reason the OSI model was created was so that different networks could interoperate. See Chapter 1 for more information. fm Page xxviii Wednesday, September 6, 2006 9:46 AM xxviii Answers to Assessment Test 18. C. The Transport layer creates virtual circuits between hosts before transmitting any data.

Fm Page 22 Tuesday, September 5, 2006 6:23 PM 22 Chapter 1 Internetworking Interface The exit interface a packet will take when destined for a specific network. Metric The distance to the remote network. Different routing protocols use different ways of computing this distance. I’m going to cover routing protocols in Chapter 5 and 6, but for now, know that some routing protocols use something called a hop count (the number of routers a packet passes through en route to a remote network), while others use bandwidth, delay of the line, or even tick count (1/18 of a second).

Routers provide a separate broadcast domain for each interface. The term bridging was introduced before routers and hubs were implemented, so it’s pretty common to hear people referring to bridges as switches. That’s because bridges and switches basically do the same thing—break up collision domains on a LAN (in reality, you cannot buy a physical bridge these days, only LAN switches, but they use bridging technologies, so Cisco still calls them multiport bridges). So what this means is that a switch is basically just a multiple-port bridge with more brainpower, right?

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