Network+ Extra 7 Flashcards
is a broken strand of copper, preventing current from flowing through a circuit. However, a short occurs when two copper connectors touch each other, resulting in current flowing through that short rather than the attached electrical circuit because the short has lower resistance.
open and short
can occur when an analog connection creates an electromagnetic field around its conductors, inducing its waveforms on a nearby analog connection.
Crosstalk
cable issues could include shorts, opens, incorrect cabling, EMI/RFI, attenuation, crosstalk, bad connector, bad cable, or using too long of a run.
Physical copper cable issues
cable issues could include attenuation, connector mismatch, wavelength mismatch, fiber-type mismatch, dirty connector, extreme bends in fiber, or trying to use too long of a fiber cable based on the specifications for that fiber.
Physical fiber cable issues
network is used for the control of remote equipment and to monitor that equipment. This may be part of an industrial control system (ICS) that is used to manage a power plant or water treatment facility. Networks like these with distributed control systems (DCSs) may have devices such as programmable logic controllers (PLCs) and remote terminal units that are proprietary.
SCADA network etc …
determines where a frame ends and the next frame begins.
frame synchronization
FTP, POP3, SMTP, IMAP, HTTP, DNS (sending info into the network)
Application Layer
packet forwarding, routing addressing, IP, ICMP, OSPF, RIPv2, BGP
Network Layer
frame relay, ATM, hubs, repeaters, modems, NIC
physical layer
___ relies on layer below it, when layer below it services layer above it
it becomes known as PDU, and this process repeats itself from layer 7 to layer 1 (adding layer upon layer ___ to PDU) - (encapsulation)
SDU
