Cisco CCNA STUDY GUIDE 2026 ACTUAL
QUESTIONS WITH SOLUTIONS GRADED A+
● [1] Physical Layer. Answer: Ex: cables, hubs, repeaters
● [1] Kinds of Cables. Answer: 1. XBase-T (Ethernet) Cable
- x = speed of cable (x = 10 = 10MB/s)
- base = base-band signaling (1 signal on wire at a time as opposed to
broadband signaling)
- t = twisted pair (4 pairs of wires twisted together to form the cable)
2. Serial (V.5) Cable
- connects via router serial port (router + router)
3. Rollover/Console Cable
- allows direct connection to router
● [1] Types of XBase-T Connections. Answer: 1. Straight-through: two
different device types will connect by this (router + switch; computer +
switch)
2. Cross-over: similar device types will connect by this (switch + switch;
router + router; PC ethernet + router ethernet)
, ● [1] Twisted-Pair Cable Types (2). Answer: 1. Shielded: This cable
type involves placing foil shielding around pairs of twisted wires to
prevent electromagnetic interference which can cause signal
degradation.
2. Unshielded: This cable type is made the same way as a shielded
twisted pair but without the extra foil shielding around the wires (the
common ethernet cable).
● [1] Repeater. Answer: A device which receives and repeats a signal to
extend its attenuation or range
● [1] Hub. Answer: A device that uses its ports to connect devices
(computers, printers, etc.) together; essentially a multi-port repeater
- hub repeats/sends received signal out to every port to all other ports
except the port that originates the signal
● [2] Data Link Layer. Answer: Controls communication on immediate
physical link between two devices (switch to switch; router to router)
NOTE: thunder-bolt figure means serial connection; wide-area links
● Data on OSI Levels. Answer: 1. Electricity
2-7: Protocol Data Unit (PDU)
QUESTIONS WITH SOLUTIONS GRADED A+
● [1] Physical Layer. Answer: Ex: cables, hubs, repeaters
● [1] Kinds of Cables. Answer: 1. XBase-T (Ethernet) Cable
- x = speed of cable (x = 10 = 10MB/s)
- base = base-band signaling (1 signal on wire at a time as opposed to
broadband signaling)
- t = twisted pair (4 pairs of wires twisted together to form the cable)
2. Serial (V.5) Cable
- connects via router serial port (router + router)
3. Rollover/Console Cable
- allows direct connection to router
● [1] Types of XBase-T Connections. Answer: 1. Straight-through: two
different device types will connect by this (router + switch; computer +
switch)
2. Cross-over: similar device types will connect by this (switch + switch;
router + router; PC ethernet + router ethernet)
, ● [1] Twisted-Pair Cable Types (2). Answer: 1. Shielded: This cable
type involves placing foil shielding around pairs of twisted wires to
prevent electromagnetic interference which can cause signal
degradation.
2. Unshielded: This cable type is made the same way as a shielded
twisted pair but without the extra foil shielding around the wires (the
common ethernet cable).
● [1] Repeater. Answer: A device which receives and repeats a signal to
extend its attenuation or range
● [1] Hub. Answer: A device that uses its ports to connect devices
(computers, printers, etc.) together; essentially a multi-port repeater
- hub repeats/sends received signal out to every port to all other ports
except the port that originates the signal
● [2] Data Link Layer. Answer: Controls communication on immediate
physical link between two devices (switch to switch; router to router)
NOTE: thunder-bolt figure means serial connection; wide-area links
● Data on OSI Levels. Answer: 1. Electricity
2-7: Protocol Data Unit (PDU)
