Ccna Chapter 5

Front 1

Why is it important to know about electricity if you are going to be studying networking?

Back 1

Networking typically involves the transfer of electrical signals using electrical devices running on electrical power.

Understanding the basics of electricity will help you understand networking signals and devices.

Front 2

How might a multimeter be useful when installing and troubleshooting computer networks?

Back 2

A multimeter would be useful for testing electrical outlets, testing for short circuits, testing voltage levels inside and outside networking devices, and simple cable testing.

Front 3

attenuation

Back 3

bits lose amplitude as they travel, giving energy to the medium

Front 4

noise

Back 4

the bit can acquire unwanted energy from external sources

Front 5

How does a hub or a repeater affect the size of a collision domain?
A. it reduces it.
B. It enlarges it.
C. It eliminates it.
D. It has no effect on it.

Back 5

B. It enlarges it.

Front 6

Sketch and describe six things that can happen to 1 bit placed on a physical medium.

Back 6

1. propogation - bits take time to travel along the medium
2. attenuation - bits lose amplitude as they travel, giving energy to the medium
3. reflection - some of the energy of the bit can bounce back in a direction opposite the original signal, causing confusion on the medium
4. noise - the bit can acquire unwanted energy from external sources
5. dispersion - bits boraden in time as they travel (pulse width gets larger)
6. collision - 2 bits from two different computers trying to communicate are on the same media at the same time.

Front 7

What connector does UTP use?

STP.
BNC.
RJ-45.
RJ-69.

Back 7

RJ-45.

Front 8

What is an advantage that coaxial cable has over STP or UTP?

It is capable of achieving 10-100 Mbps.
It is inexpensive.
It can run longer distances unboosted.
None of the above.

Back 8

It can run longer distances unboosted.

Front 9

A _____________ fiber optic cable allows multiple steams of LED-generated light?
Multimode.
Multichannel.
Multiphase.
None of the above.

Back 9

Multimode.

Front 10

Which of the following will cause a collision on an ethernet network?
A. two nodes having the same MAC
B. two or more nodes transmitting at the same time
C. non-OSI compliant protocols running on the network
D. multiple routed protocols running on the same network

Back 10

B. two or more nodes transmitting at the same time

Front 11

Use the following terms to describe what happens on a computer network:
1. electrons
2. current
3. voltage
4. resistance
5. impedance
6. circuit
7. ground
8. conductor
9. semiconductor
10. insulator
11. signal
12. noise

Back 11

Electricity is comprised of electrons. There are two main uses of electricity in networks: for powering the netwrok devices and to represent the data to be transmitted (signal) with hopefully only small amounts of noise. When a voltage is present, electroncs can be caused to flow, causing a current.

Networking devices are full of different circuits which do different jobs.

Electrical devices must be properly connected to ground, and ground is the reference voltage level of 0 volts when studying signal.

Networking media are often made of conductors coated with insultators.

The brains of intelligent netwokring devices are made from semiconductors.

Front 12

dispersion

Back 12

bits boraden in time as they travel (pulse width gets larger)

Front 13

What is the maximum cable length for STP (without a repeater, etc)?

A. 100 ft.
B. 100 m.
C. 150 ft.
D. 1000 m.

Back 13

B. 100 m.

Front 14

A more compact version of coaxial cable is known as ......

ThinNet.
BNC.
STP.
UTP.

Back 14

ThinNet.

Front 15

propogation

Back 15

propogation - bits take time to travel along the medium

Front 16

reflection

Back 16

some of the energy of the bit can bounce back in a direction opposite the original signal, causing confusion on the medium

Front 17

Describe three modern ways to encode data for long distance transmission.

Back 17

1. pulses of voltage on copper wire
2. pulses of light in optical fibers
3. pulses of electromagnetic waves in free space

Front 18

How many pairs of wire make up a UTP cable?
2 pair.
4 pair.
6 pair.
8 pair.

Back 18

4 pair.

Front 19

Which of the following cables is used to connect a router to the serial port of a PC?
A. a console cable
B. a cross -connect cable
C. an inverted cable
D. a patch cable

Back 19

A. a console cable

Front 20

What is one advantage of using fibre optic cabling in networks?
A. It is inexpensive.
B. It is easy to install.
C. It is available with or without an outer shield.
D. It is not susceptible to electromagnetic interference.

Back 20

D. It is not susceptible to electromagnetic interference.

Front 21

collision

Back 21

2 bits from two different computers trying to communicate are on the same media at the same time.

Front 22

150 ohm STP is used primarily for what installation?

A. Ethernet.
B. Fast Ethernet.
C. Token Ring.
D. None of the above.

Back 22

C. Token Ring.

Front 23

What is the importance of the EIA/TIA standards?

Provide framework for the implementation of the OSI model.
Provide guidelines for NIC manufacturers to follow.
Provide minimum media requirement for multi-product & multi-vendor environments.
None of the above.

Back 23

Provide minimum media requirement for multi-product & multi-vendor environments.

Front 24

For the horizontal cabling components, TIA/EIA-568A requires a minimum of how may connectors in each work area?
1
2
4
6

Back 24

2

Front 25

What does the twisting of the wires do in CAT-5 cable?

Makes it thinner.
Makes it less expensive.
Reduces noise problems.
Allows six pairs to fit in the space of four pairs.

Back 25

Reduces noise problems.

Front 26

The standard 10BaseT cable is Category __.

3.
4.
5.
6.

Back 26

5

Front 27

The network area within which data packets originate and collide is a ________ ____________.

Collision domain.
Network domain.
Collision segment.
Network segment.

Back 27

Collision domain.

Front 28

Using repeaters __________ the collision domain.

Reduces.
Has no effect on.
Extends.
None of the above.

Back 28

Extends.

Front 29

The process of installing complex networking devices that break up the domains by using bridges, switches and routers is knowns as:

Sectioning.
Segmentation.
Collision Domain Reduction.
None of the above.

Back 29

Segmentation

Front 30

What physical topology has all its nodes connected directly to one link, and has no other connections between nodes?

Linear bus.
Star.
Ring.
None of the above.

Back 30

Linear bus.

Front 31

What physical topology has all the devices daisy-chained together?

Linear bus.
Star.
Ring.
None of the above.

Back 31

Ring

Front 32

What is the primary disadvantage of the star network topology?

Doesn't allow all other nodes to communicate with each other conveniently.
If the central node fails, the whole network becomes disconnected.
It is much slower than the other topologies.
None of the above.

Back 32

If the central node fails, the whole network becomes disconnected.

Front 33

In a complete or full-mesh topology -- every node is:

Linked directly to every other node.
Connected to two central nodes.
Linked indirectly to every other node.
None of the above.

Back 33

Linked directly to every other node.

Front 34

The cellular topology uses ________ as its medium?

Electromagnetic waves.
The cellular network.
Infrared signals.
The atmosphere or the vacuum of space.

Back 34

The atmosphere or the vacuum of space.

Front 35

A ______ Network topology is a single closed ring consisting of node and links with each node connected to only two adjacent nodes.

Ring.
Irregular.
Star.
Tree.

Back 35

Ring

Front 36

A ______ Network topology uses a trunk node from which it branches out to other nodes?

Star.
Ring.
Tree.
Irregular.

Back 36

Tree

Front 37

The phone system is said to be structured as:

A Star Network.
An Extended Star Network.
A Trunk Network.
A Tree Network.

Back 37

An Extended Star Network

Front 38

In a complete (______) Network topology, every node is directly linked to every other node?

Mesh.
Cellular.
Dual Ring.
Bus.

Back 38

Mesh

Front 39

A ______ Network topology is a LAN architecture in which transmissions from network stations propagate the length of the medium in both directions and are received by all other stations?

Star.
Linear Bus.
Tree.
Irregular.

Back 39

Linear Bus

Front 40

A ___________ Network topology acts like two independent rings where only one ring is in use at a time?

Dual Ring.
Extended Star.
Tree.
Irregular.

Back 40

Dual Ring

Front 41

What type of fiber-optic cabled is required by the TIA/EIA 568B standard for horizontal cabling?

2 Pair of 100 ohm cable.
2 Pair of 150 ohm cable.
2 Fibers of 62.5/125 um multimode cable.
4 Fibers of 62.5/125 um multimode cable.

Back 41

2 Fibers of 62.5/125 um multimode cable

Front 42

How can you determine which category of UTP cable any cabling belongs to?

By looking at the the end connectors.
By reading the UL marking.
By measuring the cable diameter.
By the color of the cable sheathing.

Back 42

By reading the UL marking.

Front 43

Which of the following best describes an access method?

The method used by software to access network file servers.
The method used to verify users as authorized for access to the network.
The way users access the network.
The way network devices access the network medium.

Back 43

The method used by software to access network file servers.

Front 44

Ethernet uses what access method?

Token Ring transmission protocol.
Ethernet does not use an access method.
Carrier sense multiple access collision detect.
Ethernet transmission carrier collision detect.

Back 44

Ethernet transmission carrier collision detect.

Front 45

Which of the following best describes a collision?

Frames from two devices impact and are damaged when they meet on the physical media.
Two nodes transmit at the same time & one data packet has priority so it removes the lesser packet.
Two data transmissions cross paths on the network media and corrupt each other.
A data transmission is corrupted due to an energy spike over the network media.

Back 45

Frames from two devices impact and are damaged when they meet on the physical media.

Front 46

Which of the following best describes a backoff algorithm?

A process wherein the network holds up some data so that important data can get through.
The retransmission delay enforced when a collision occurs.
The signal that a device on the network sends out to tell other devices data is being sent.
A mathematical function performed by networking software that prioritizes data packets.

Back 46

The retransmission delay enforced when a collision occurs.

Front 47

The TIA/EIA 568A standard specifies only Category 3, Category 4 and Category 5 cables qualify for use in LANs:

True.
False.

Back 47

True

Front 48

The TIA/EIA 568A standard calls for running 3 cables to each outlet. One for voice and two for data.


True.
False.

Back 48

False

Front 49

The TIA/EIA 568A standard addresses:

Horizontal cabling.
Telecommunications closets.
Backbone cabling.
Equipment Rooms.
Work Areas.
Entrance facilities.
All of the above.

Back 49

All of the above.

Front 50

For shielded twisted-pair cable, the TIA/EIA 568A standard calls for two pairs of 150 ohm cable?

True.
False.

Back 50

True

Front 51

For unshielded twisted-pair cable, the TIA/EIA 568A standard calls for four pairs of 100 ohm cable?

True.
False.

Back 51

True

Front 52

Common network media include coaxial, twisted pair and fiber-optic cable?

True.
False.

Back 52

True

Front 53

For fiber-optic cable, the TIA/EIA 568A standard calls for 62.5/125 multimode cable?

True.
False.

Back 53

True

Front 54

Category 3 (CAT 3) is by far the most frequently recommended and implemented cabling installations today.

True.
False.

Back 54

False

Front 55

What is the purpose of the second ring in a dual ring network?

Duplex.
Signaling.
Redunancy.
None of the above.

Back 55

Redundancy

Front 56

Which of the following describes the area in which data frames originate and collide?
A. broadcast domain
B. collision domain
C. collision segment
D. network domain

Back 56

B. collision domain

Front 57

Which of the following is a characteristic of fiber-optic cable?
A. It uses an intense incandescent light.
B. Its core is made of highly reflective Kevlar.
C. It relies on total internal cancellation to guide light for long distances.
D. It is capable of higher data rates than other types of network media.

Back 57

D. It is capable of higher data rates than other types of network media.

Front 58

Why are the pairs of wires twisted together in UPT cable?
A. Twisting of the wires makes six pairs fit in the space of four pairs.
B. Twisting of the wires makes it less expensive.
C. Twisting of the wires makes it thinner.
D. Twisting the wires reduces noise problems.

Back 58

D. Twisting the wires reduces noise problems.