IS589
Ch3 TXT Question 1, 3, and 6
1. How does a multipoint circuit differ from a point-to-point circuit?
Multiport circuit, in this configuration many computers are connected to the same circuit. This means that each must share the circuit with the others. The disadvantage is that only one computer can use the circuit at a time. In order words when one computer is sending or receiving data all others must wait. The advantage is in the reduction of cable needed, thus reducing cost. Point to point circuit, also called dedicated circuits, are dedicated to the use of the two computers (one on each point). This type of configuration is used when the computers generate enough data to fill the capacity of the communication circuit. When this type of circuit is used each computer has its own circuit running from itself to the other computer. This is very expensive.
3. Describe the 3 types of guided media?
Twisted Pair is a pair of wires used in standard telephone wiring. They are twisted to reduce interference cause by the other twisted pairs in the same cable bundle. Twisted pair wires go from homes and offices to the telephone company end office. The LAN used twisted pair cables pack four sets of pairs. Some types of twisted pair cables commonly used in LANs are, CAT5, CAT5e, and CAT6.
Coax is a type of guided media which has a copper core with an outer cylindrical shell for isolation. The outer shield just under the shell is the second conductor. Because they have additional shielding provided by their multiple layers of material, coax cables are less prone to interference and errors that TP cables. Coax cable costs significantly more than twisted pair but yet offer little advantage other than better shielding from interference, this can explain with this technology is rapidly disappearing since shielded TP cables can provide the same level of quality at a lower