JA Net+ Ch3 Flashcards
What is attenuation?Chapter 3 Page 74
The degradation of a signal due to the medium itself and the distance signals have to travel.
What did the pentagon use to encase wires to prevent threats from tapping into their communications?Chapter 3 Page 75
A lead shielding.
Why are fiber optic cables less susceptible to magnetic flux?Chapter 3 Page 75
These cables use light on a glass or a really pure plastic strand, and light is not susceptible to magnetic flux.
Max frequency of Cat 5e cable?Chapter 3 Page 75
100 MHz, and can run 1Gbps for short distances.
Max frequency of Cat 6?Chapter 3 Page 75
250Mhz, and can run 1Gbps with ease, unlike the Cat 5e.
568A vs 568B wires?Chapter 3 Page 77
The only difference between them is pairs 2 and 3 (orange and green) are swapped.
What is the use of a crossover cable?Chapter 3 Page 78
Typically they are used to connect two switches together, but it can also be used to test communications between two workstations directly, bypassing the switch.
What is the use of a rolled/rollover cable?Chapter 3 Page 80
You can use a rolled Ethernet cable to to connect to a host EIA-TIA 232 interface to a router console serial communication port.
COMChapter 3 Page 80
Console serial communication port.
MDFChapter 3 Page 83
Main distribution frame. A wiring point thats generally used as a reference point for telephone lines.
IDFChapter 3 Page 83
Intermediate distribution frame. Located in an equipment or telecommunications room. It’s connected to the MDF and is used to provide greater flexibility for the distribution of all communication lines in the building.
DemarcChapter 3 Page 84
Short for demarcation, is the last point of responsibility for the service provider. It’s often an RJ-45 jack used that your channel service unit/data service unit (CSU/DSU) connects from your router to WAN connections.
