Explain how traceroute, ping, and tcpdump work and what
they are used for?
Answer Posted / abhilash
Traceroute;
Traceroute works by increasing the "time-to-live" value of
each successive batch of packets sent. The first three
packets sent have a time-to-live (TTL) value of one
(implying that they are not forwarded by the next router and
make only a single hop). The next three packets have a TTL
value of 2, and so on. When a packet passes through a host,
normally the host decrements the TTL value by one, and
forwards the packet to the next host. When a packet with a
TTL of one reaches a host, the host discards the packet and
sends an ICMP time exceeded (type 11) packet to the sender.
The traceroute utility uses these returning packets to
produce a list of hosts that the packets have traversed en
route to the destination. The three timestamp values
returned for each host along the path are the delay (aka
latency) values typically in milliseconds (ms) for each
packet in the batch. If a packet does not return within the
expected timeout window, a star (asterisk) is traditionally
printed. Traceroute may not list the real hosts. It
indicates that the first host is at one hop, the second host
at two hops, etc. IP does not guarantee that all the packets
take the same route. Also note that if the host at hop
number N does not reply, the hop will be skipped in the output.
Ping:
It works by sending ICMP “echo request” packets to the
target host and listening for ICMP “echo response” replies.
Ping estimates the round-trip time, generally in
milliseconds, and records any packet loss, and prints a
statistical summary when finished.
Is This Answer Correct ? | 20 Yes | 2 No |
Post New Answer View All Answers
what solution for High Utilization Cisco router 2851 ? please Need Help ASAP.
Define peer to peer?
Suppose if a network which contains two servers and twenty workstations, where is the best place to install an anti-virus program?
What is the the advantage of address sharing?
Define proxy servers and how do they protect computer networks?
Define one basic requirement for establishing vlans?
salient feature of network administrator
Explain the role of ieee in computer networking?
Define the role of ieee in computer networking?
Which technologies are involved in establishing wan links?
if the server has slow how to check the server performance? How to check server performance what is the procedure?
Define tunnel mode?
how many progamming languages are found
Explain the osi role in computer networking?
Define proxy servers?