E7 Tools

Question 1

What does intermittent mean?

Answer 1

sometimes it happens. sometimes it does not happen

Question 2

What does a successful ping prove?

Answer 2

All the pieces involved were working AT THAT MOMENT.

Question 3

What does a failed ping prove?

Answer 3

ONE OR MORE pieces involved were not working at that moment.

Question 4

What one statistic does ping report?

Answer 4

latency

Question 5

Using ping to troubleshoot, conventional wisdom says you should ping what first?

Answer 5

yourself, using your localhost address: 127.0.0.1

Question 6

Using ping to troubleshoot, conventional wisdom says you should ping what second?

Answer 6

yourself, using your LAN address

Question 7

Using ping to troubleshoot, conventional wisdom says you should ping what third?

Answer 7

something else inside your LAN, typically your router or gateway

Question 8

Using ping to troubleshoot, conventional wisdom says you should ping
what fourth?

Answer 8

something beyond your LAN

Question 9

What is localhost?

Answer 9

Localhost is the computer you are using.

Question 10

What is the IPv4 address of localhost?

Answer 10

127.0.0.1

Question 11

What things does a successful ping to localhost prove?

Answer 11

Your network stack (software) is working.

Question 12

How can you (the user) find your IP address?

Answer 12

Use ipcong (or ifcong)

Question 13

What things does a successful ping to your own LAN address prove?

Answer 13

1. Your network stack (software) is working and 2. your network card
   (hardware) is working.

Question 14

What things does a successful ping to your neighbor prove?

Answer 14

1. Your network stack (software) is working. 2. Your network card (hardware) is working. Your neighbor computer is working

Question 15

What is a smurf attack?

Answer 15

A broadcast ping with a fake source address.

Question 16

What is a broadcast ping with a fake source address called?

Answer 16

A smurf attack

Question 17

What information can a broadcast ping provide?

Answer 17

(a) IP addresses and (b) latencies of all devices within your LAN.

Question 18

What IP address is used for global broadcast?

Answer 18

255.255.255.255

Question 19

What things does a successful ping to something beyond your LAN prove?

Answer 19

1. Your network stack (software) is working. 2. Your network card (hardware) is working. 3. Your connection (cable) is working. 4 Your gateway router is working.

Question 20

What two things does traceroute report?

Answer 20

(a) The list of routers between source and destination. (b) The latency
for each router.

Question 21

What does TTL stand for?

Answer 21

time to live

Question 22

What is the purpose of TTL?

Answer 22

TTL stops innite loops.

Question 23

How does traceroute use TTL?

Answer 23

It sends packets with varying TTL counts. As each packets dies, its location of death is reported

Question 24

What does FTP stand for?

Answer 24

file transfer protocol

Question 25

Is FTP considered to be secure? Why?

Answer 25

No. Trac (data) is not encrypted.

Question 26

Which is more secure, ssh or ftp?

Answer 26

ssh

Question 27

Which is more widely available, ssh or ftp?

Answer 27

ftp

Question 28

What port does ftp normally use?

Answer 28

21

Question 29

Is telnet considered to be secure? Why?

Answer 29

No. Trac (data) is not encrypted.

Question 30

Is ssh considered to be secure? Why?

Answer 30

Yes. Trac (data) is encrypted.

Question 31

Which is more secure, ssh or telnet?

Answer 31

telnet

Question 32

What port does telnet normally use?

Answer 32

23

Question 33

What is telnetd?

Answer 33

telnet daemon

Question 34

What is a daemon?

Answer 34

A daemon is a program that interacts with other programs instead of interacting with an end user.

Question 35

In a program name, what does the sux d usually mean?

Answer 35

daemon

Question 36

What port does ssh normally use?

Answer 36

22

Question 37

What does ssh stand for?

Answer 37

secure shell

Question 38

How does ssh establish a secure connection?

Answer 38

It uses a public-key system like RSA to create a shared secret.

Question 39

Which is more current, nslookup or dig?

Answer 39

dig

Question 40

What does deprecated mean?

Answer 40

being phased out

Question 41

What does Wireshark do?

Answer 41

It captures data that is passing through a nearby interface