Traceroute Flashcards
what is a utility that lets you discover the path between two nodes, and gives you informations about each hop along the way?
Traceroute
what command lets me determine if I can reach a computer from another one?
ping
what command lets me understand the general quality of a connection?
ping
why do I need traceroute?
to determine where in a long series of node hops a problem is.
What utility works by a manipulation of the TTL field at the iP level?
Traceroute
What is decremented by one every router that forwards a packet?
TTL field
What happens when a TTL field is 0?
packet is discarded
When is a ICMP time-exceeded message sent back to the originating host?
When the TTL field reaches 0.
What utility uses the TTL field by first setting it to 1 for the first packet then 2 for the 2nd, 3 for the 3rd, and so on?
traceroute
What utility can make sure the first packet sent will be discarded by the first router hop, so it gets back an ICMP time-exceeded message?
Traceroute
How long will Traceroute continue?
Until the packet reaches its destination.
What does Traceroute do for each hop? How many packets?
Traceroute sends three identical packets for each hop.
What command output lets me see the number of the hop and the round trip time for all three packets, IP of the device at each hop, and a host name if it can resolve one?
Traceroute
What does Traceroute do on linux and MacOS?
sends UDP packets to very high port numbers.
What is the shortening of the command name in Windows?
tracert
what does tracert default to on Windows?
ICMP echo requests
What are two similar tools to traceroute on Linux, Mac, and Windows?
mtr: linux and mac, pathping: windows
What tools act as long running trace routes so you can see how things change over a period of time?
mtr and pathping
What tool that acts as a long Running traceroute runs in real time and will continually update its output with all the current aggregate data about traceroute?
mtr
what tool that acts is a long running trace route runs for 50 seconds and then displays the final aggregate data all at once?
pathping
