Lesson 12: Network Troubleshooting

Question 1

A
protocol used to determine a network
host’s address. ARP can also refer to a
command line tool that is used to display
and/or manipulate the ARP table
on a network computer.

Answer 1

arp

Question 2

A ping command that uses the
Address Resolution Protocol (ARP) to
issue an “arp request” rather than the
Internet Control Message Protocol
(ICMP) to issue an “echo request.”

Answer 2

ARP ping

Question 3

A table, generated by the Address
Resolution Protocol (ARP), stored in
the memory of a network device, which
contains the IP addresses and MAC
addresses of other network devices on
the local subnet with which it has been
in contact.

Answer 3

arp table

Question 4

The act of reflecting or splitting
radio signals off certain surfaces and
materials.

Answer 4

bounce

Question 5

A device used in telephone communications
that allows a technician
to connect to any phone connection
and use that connection like a regular
phone, or to test the connection to
make sure that it’s working.

Answer 5

butt set

Question 6

An electronic device used to
verify connections in a network cable.

Answer 6

cable tester

Question 7

A character-
based computer interface that
requires the user to type text commands
into a computer or terminal using a
specific syntax to execute programs or
perform tasks.

Answer 7

command-line interface (CLI)

Question 8

An event in which the signal in
one wire interferes with the signal in
another wire.

Answer 8

crosstalk

Question 9

A
command-line tool used to query DNS
servers to gain information about them.

Answer 9

Domain Information Groper (dig)

Question 10

Interference
caused by something external to the
network.

Answer 10

environmental interference

Question 11

A problem that occurs
when the incorrect Extended Service
Set Identifier (ESSID) is set up in a
wireless device’s configuration.

Answer 11

ESSID mismatch

Question 12

A command-line tool used to
display the DNS hostname of the local
machine.

Answer 12

hostname

Question 13

A command-line tool that is the
Linux/UNIX equivalent to ipconfig.

Answer 13

ifconfig

Question 14

The electric resistance of a data
cable.

Answer 14

impedance

Question 15

A problem that occurs when
strong electromagnetic fields interfere
with the electrical impulses used to
send signal across a copper wire.

Answer 15

interference

Question 16

A command-line tool found in all
current versions of Microsoft Windows
that is used to display network
configuration values.

Answer 16

ipconfig

Question 17

A testing methodology
that uses a specially designed connector
or command to feed data back in
through the same port that transmitted
it, to make sure that the port is physically
functional.

Answer 17

loopback testing

Question 18

A device designed to take several
types of measurements, such as voltage,
amperage, resistance, and continuity.

Answer 18

multimeter

Question 19

A Linux/UNIX
command-line tool that combines the
capabilities and functionality of traceroute
and ping.

Answer 19

my traceroute (MTR)

Question 20

A command-line tool used to
obtain information about a local
machine and the devices it is connected
to, based on NetBIOS names.

Answer 20

nbtstat

Question 21

A command-line tool used to
display information about network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.

Answer 21

netstat

Question 22

A command-line tool used to
look up DNS servers.

Answer 22

Nslookup

Question 23

An electronic instrument used
to test fiber-optic cables. See also timedomain
reflectometer (TDR).

Answer 23

Optical Time-Domain Reflectometer (OTDR)

Question 24

A program used to determine
whether a specific IP address can be
reached on the network.

Answer 24

ping

Question 25

A testing methodology in
which you use the ping command to
test the full range of functionality for a
specific network connection.

Answer 25

ping testing

Question 26

A hand tool designed
to terminate wires on a 110 block or a
66 block.

Answer 26

punch down tool

Question 27

A command used to view and/or
manipulate the routing table on the
targeted device by adding or removing
static routes.

Answer 27

route

Question 28

A problem that occurs when wires
carrying electrical signals or power
physically touch each other after having
their insulation worn off at the point
where they make contact.

Answer 28

short

Question 29

A handheld tool used to cut wire,
wire ties, and similar type things.

Answer 29

snips

Question 30

An event that occurs
when all devices on a network do not use
the same standard for communication.

Answer 30

standards mismatch

Question 31

A condition in which two
or more switches keep sending frames
back and forth to each othe and
nowhere else on the network.

Answer 31

switch loop

Question 32

A device that
monitors the temperature of an electric
device to avoid having it rise above certain
temperatures that render electronic
devices unreliable.

Answer 32

temperature monitor

Question 33

A special lab scenario set
up to resemble the real environment.

Answer 33

test environment

Question 34

An
electronic instrument used to test inplace
non-fiber cables for faults.

Answer 34

Time-Domain Reflectometer (TDR)

Question 35

A tool used to find the end of
a long run of cable.

Answer 35

toner probe

Question 36

A variation on ping
testing that displays the name or IP
address at which a nerwork connection
stops functioning.

Answer 36

trace route testing

Question 37

A Linux/UNIX command-line
tool that reports back each stop a packet
makes on its way to a destination.

Answer 37

traceroute

Question 38

Microsoft Windows version of
traceroute.

Answer 38

tracert

Question 39

A device designed
ro moniror electrical circuits and look
for problems in the electriciry coming
through the circuit.

Answer 39

voltage event recorder