shanthiavari <[EMAIL PROTECTED]> wrote: What's the difference
between UDP and TCP?
Difference between TCP and UDP TCP
UDP
Reliability: TCP is connection-oriented protocol. When a file or message
send it will get delivered unless connections fails. If connection lost, the
server will request the lost part. There is no corruption while transferring a
message.
Reliability: UDP is connectionless protocol. When you a send a data or
message, you don’t know if it’ll get there, it could get lost on the way. There
may be corruption while transferring a message.
Ordered: If you send two messages along a connection, one after the
other, you know the first message will get there first. You don’t have to worry
about data arriving in the wrong order.
Ordered: If you send two messages out, you don’t know what order they’ll
arrive in i.e. no ordered
Heavyweight: - when the low level parts of the TCP “stream” arrive in the
wrong order, resend requests have to be sent, and all the out of sequence parts
have to be put back together, so requires a bit of work to piece together.
Lightweight: No ordering of messages, no tracking connections, etc. It’s
just fire and forget! This means it’s a lot quicker, and the network card / OS
have to do very little work to translate the data back from the packets.
Streaming: Data is read as a “stream,” with nothing distinguishing where
one packet ends and another begins. There may be multiple packets per read call.
Datagrams: Packets are sent individually and are guaranteed to be whole if
they arrive. One packet per one read call.
Examples: World Wide Web (Apache TCP port 80), e-mail (SMTP TCP port 25
Postfix MTA), File Transfer Protocol (FTP port 21) and Secure Shell (OpenSSH
port 22) etc.
Examples: Domain Name System (DNS UDP port 53), streaming media
applications such as IPTV or movies, Voice over IP (VoIP), Trivial File
Transfer Protocol (TFTP) and online multiplayer games etc
How would you find what ports are open on a machine (local and
remote)?
#netstat -ant
What's the OSI model? What are the seven levels?
OSI open system Interconnection
1)Application 2) Session 3) Presentation 4) Transport 5) Network 6)Data Link
7)Physical
How would you capture network traffic?
Ans : #iptraf (comamnd)
"Do not worry about anything; instead
PRAY ABOUT EVERYTHING."
Philippians 4:6
Best Regards
Dinesh Jadhav - 9224661100
Redhat Certified Engineer
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