E7 Tools Flashcards
What does intermittent mean?
sometimes it happens. sometimes it does not happen
What does a successful ping prove?
All the pieces involved were working AT THAT MOMENT.
What does a failed ping prove?
ONE OR MORE pieces involved were not working at that moment.
What one statistic does ping report?
latency
Using ping to troubleshoot, conventional wisdom says you should ping what first?
yourself, using your localhost address: 127.0.0.1
Using ping to troubleshoot, conventional wisdom says you should ping what second?
yourself, using your LAN address
Using ping to troubleshoot, conventional wisdom says you should ping what third?
something else inside your LAN, typically your router or gateway
Using ping to troubleshoot, conventional wisdom says you should ping
what fourth?
something beyond your LAN
What is localhost?
Localhost is the computer you are using.
What is the IPv4 address of localhost?
127.0.0.1
What things does a successful ping to localhost prove?
Your network stack (software) is working.
How can you (the user) find your IP address?
Use ipcong (or ifcong)
What things does a successful ping to your own LAN address prove?
- Your network stack (software) is working and 2. your network card
(hardware) is working.
What things does a successful ping to your neighbor prove?
- Your network stack (software) is working. 2. Your network card (hardware) is working. Your neighbor computer is working
What is a smurf attack?
A broadcast ping with a fake source address.
What is a broadcast ping with a fake source address called?
A smurf attack
What information can a broadcast ping provide?
(a) IP addresses and (b) latencies of all devices within your LAN.
What IP address is used for global broadcast?
255.255.255.255
What things does a successful ping to something beyond your LAN prove?
- 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.
What two things does traceroute report?
(a) The list of routers between source and destination. (b) The latency
for each router.
What does TTL stand for?
time to live
What is the purpose of TTL?
TTL stops innite loops.
How does traceroute use TTL?
It sends packets with varying TTL counts. As each packets dies, its location of death is reported
What does FTP stand for?
file transfer protocol
Is FTP considered to be secure? Why?
No. Trac (data) is not encrypted.
Which is more secure, ssh or ftp?
ssh
Which is more widely available, ssh or ftp?
ftp
What port does ftp normally use?
21
Is telnet considered to be secure? Why?
No. Trac (data) is not encrypted.
Is ssh considered to be secure? Why?
Yes. Trac (data) is encrypted.
Which is more secure, ssh or telnet?
telnet
What port does telnet normally use?
23
What is telnetd?
telnet daemon
What is a daemon?
A daemon is a program that interacts with other programs instead of
interacting with an end user.
In a program name, what does the sux d usually mean?
daemon
What port does ssh normally use?
22
What does ssh stand for?
secure shell
How does ssh establish a secure connection?
It uses a public-key system like RSA to create a shared secret.
Which is more current, nslookup or dig?
dig
What does deprecated mean?
being phased out
What does Wireshark do?
It captures data that is passing through a nearby interface
