Troubleshooting Tools

Question 1

ipconfig

Answer 1

View and Manage IP configuration
/all = display all details
/release = release DHCP lease
/renew = renew DHCP lease
/flushdns = flush the DNS resolver cache

Question 2

netstat

Answer 2

Display network statistics

• a = show all active connections
• b = show binaries
• n = do not resolve names

Question 3

ifconfig

Answer 3

View and manage IP configuration

linux interface configuration

Question 4

ping
ping6
ping -6

Answer 4

test reachability
test reachability to TCP/IP address
-t = ping until stopped with Ctrl c
-a = resolve address to hostname
-n  = send # of echo requests
-f = send with don't fragment flag set

Question 5

tracert

tracert -6

Answer 5

pings every router hop from the source to the destination and reports the round time trip for every router hop

Question 6

nbtstat

Answer 6

Query NetBIOS over TCP/IP information

• n = list local NetBIOS names
• A = list remote NetBios names
• a = list remote NetBIOS names

Question 7

nslookup / dig

Answer 7

look up information from DNS servers

Question 8

arp

Answer 8

Address Resolution protocol information

- a = view the local ARP table

Question 9

pathping

Answer 9

combination of ping and traceroute

Question 10

multimeter

Answer 10

AC/DC voltages
continuity
wire mapping
fuse status

Question 11

cable tester

Answer 11

can identify missing pins or crossed wires

not generally used for frequency testing

Question 12

toner probe

Answer 12

puts an analog sound on the wire
inductive probe doesnt need to touch the copper
easy to use
different connectors

Question 13

speed test sites

Answer 13

bandwidth testing
provide useful pre and post change analysis
measure at different times
not all sites are the same

Question 14

looking glass sites

Answer 14

view routing table configurations

Question 15

protocol analyzer

Answer 15

capture and display network traffic

use a physical tap or redirect on the switch