I. Rewrite the extract filling in the missing letters

VII. Fill in the Blanks Complete the following sentences by writing the correct word.

VI. Find information on The Twelve Networking Truths by R. Callon And.

1. It Has To Work.

2. No matter how hard you push and no matter what the priority, you can't increase the speed of light. (2a) (corollary). No matter how hard you try, you can't make a baby in much less than 9 months. Trying to speed this up *might* make it slower, but it won't make it happen any quicker.

3. With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead.

4. Some things in life can never be fully appreciated nor understood unless experienced firsthand. Some things in networking can never be fully understood by someone who neither builds commercial networking equipment nor runs an operational network.

5. It is always possible to aglutenate multiple separate problems into a single complex interdependent solution. In most cases this is a bad idea.

6. It is easier to move a problem around (for example, by moving the problem to a different part of the overall network architecture) than it is to solve it. It is always possible to add another level of indirection.

7. It is always something Good, Fast, Cheap: Pick any two (you can't have all three).

8. It is more complicated than you think.

9. For all resources, whatever it is, you need more. Every networking problem always takes longer to solve than it seems like it should.

10. One size never fits all.

11. Every old idea will be proposed again with a different name and a different presentation, regardless of whether it works.

12. In protocol design, perfection has been reached not when there is nothing left to add, but when there is nothing left to take away.

1. ______________, which consists of special hardware and software, protect internal networks from external networks.

2. A(n)_____________ converts analog signals to digital and vice versa.

3. A(n) _____________ ______________ is a type of fiber-optic telephone line.

4. The ______________ is a worldwide system composed of thousands of smaller networks.

5. In a client/server network, the _____________ manages network resources.

Task 4 Can you write? Let’s do it!

Identifying Network Types. Netwo…ks can be catego…ized by size as local a…ea netwo…ks (LANs) or wide are netwo…ks (WANs). They can also be clas…ified by t…pe, which incl…des client/se…ver, peer-to-peer, int…anet, ext…anet, and the Inte…net.

Local Area Networks (LAN). Most LANs connect pe…sonal compute…s, wo…kstations, and other dev…ces such as p…inters and scan…ers in a lim…ted geograp…ical a…ea, such as an of…ice bu…lding, sc…ool, or home. E…ch devi…e on the net…ork is called a no…e, and each node gene…ally sha…es resou…ces such as a p…inter, prog…ams, and other ha…dware.

Wireless LAN (WLAN). A wi…eless LAN (WLAN) is a va…iation of the LAN that uses few if any p…ysical wi…es to con…ect devi…es. To com…unicate on a WLAN, the comp…ter and other devi…es that ac…ess the net…ork must each cont…in a wi…eless dev…ce such as a ne…work ca…d, fla…h ca…d, PC ca…d, USB net…ork adap…er, or other t…pe of bu…lt-in wi…eless cap…bility or a wi…eless net…ork ca…d.

Wide Area Networks (WAN). A WAN cove…s a large geog…aphical a…ea and can cont…in com…unication lin…s acro…s met…opolitan, reg…onal, or nat…onal bou…daries. The com…unications area might be as la…ge as a st…te, count…y, or even the wo…ld. The la…gest WAN is the Inte…net. Most WANs con…ist of two or more LANs and are conne…ted by ro…ters, which dire…t traf…ic on the Internet or on m…ltiple con…ected netwo…ks. Communi…ations c…annels can incl…de telep…one systems, fiberopti…s, satell…tes, micro…aves, or any combin…tions of these.

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